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Salama",authors:[null]},{id:"8461",title:"Near Field On Chip RFID Antenna Design",slug:"near-field-on-chip-rfid-antenna-design",signatures:"Alberto Vargas and Lukas Vojtech",authors:[null]},{id:"8462",title:"RFID TAGs Coil's Dimensional Parameters Optimization As Excitable Linear Bifurcation System",slug:"rfid-tags-coil-s-dimensional-parameters-optimization-as-excitable-linear-bifurcation-system",signatures:"Ofer Aluf",authors:[null]},{id:"8463",title:"Active RFID TAGs System Analysis of Energy Consumption As Excitable Linear Bifurcation System",slug:"active-rfid-tags-system-analysis-of-energy-consumption-as-excitable-linear-bifurcation-system",signatures:"Ofer Aluf",authors:[null]},{id:"8464",title:"RFID Tag Antennas Mountable on Metallic Platforms",slug:"rfid-tag-antennas-mountable-on-metallic-platforms",signatures:"Byunggil Yu, Frances J. Harackiewicz and Byungje Lee",authors:[null]},{id:"8465",title:"RFID in Metal Environments: An Overview on Low (LF) and Ultra-Low (ULF) Frequency Systemsled",slug:"untitrfid-in-metal-environments-an-overview-on-low-lf-and-ultra-low-ulf-frequency-systemsled",signatures:"D. Ciudad, P. Cobos Arribas, P. Sanchez and C. Aroca",authors:[null]},{id:"8466",title:"Development of Metallic Coil Identification System Based on RFID",slug:"development-of-metallic-coil-identification-system-based-on-rfid",signatures:"Myunsik Kim, Beobsung Song, Daegeun Ju, Eunjung Choi, and Byunglok Cho",authors:[null]},{id:"8467",title:"Virtual Optimisation and Verification of Inductively Coupled Transponder Systems",slug:"virtual-optimisation-and-verification-of-inductively-coupled-transponder-systems",signatures:"Frank Deicke, Hagen Grätz and Wolf-Joachim Fischer",authors:[null]},{id:"8468",title:"Fabrication and Encapsulation Processes for Flexible Smart RFID Tags",slug:"fabrication-and-encapsulation-processes-for-flexible-smart-rfid-tags",signatures:"Estefania Abad, Barbara Mazzolai, Aritz Juarros, Alessio Mondini, Angelika Krenkow and Thomas Becker",authors:[null]},{id:"8469",title:"Conduct Radio Frequencies with Inks",slug:"conduct-radio-frequencies-with-inks",signatures:"Rudie Oldenzijl, Gregory Gaitens and Douglass Dixon",authors:[null]},{id:"8470",title:"Inkjet Printing and Alternative Sintering of Narrow Conductive Tracks on Flexible Substrates for Plastic Electronic Applications",slug:"inkjet-printing-and-alternative-sintering-of-narrow-conductive-tracks-on-flexible-substrates-for-pla",signatures:"Jolke Perelaer and Ulrich S. Schubert",authors:[null]},{id:"8471",title:"Tag4M, a Wi-Fi RFID Active Tag Optimized for Sensor Measurements",slug:"tag4m-a-wi-fi-rfid-active-tag-optimized-for-sensor-measurements",signatures:"Silviu Folea and Marius Ghercioiu",authors:[null]},{id:"8472",title:"Organic RFID Tags",slug:"organic-rfid-tags",signatures:"Kris Myny, Soeren Steudel, Peter Vicca, Monique J. Beenhakkers, Nick A.J.M. van Aerle, Gerwin H. Gelinck, Jan Genoe, Wim Dehaene, and Paul Heremans",authors:[null]}]}]},onlineFirst:{chapter:{type:"chapter",id:"69518",title:"Multi-Field Synergy Process for Polymer Plasticization: A Novel Design Concept for Screw to Facilitate Phase-to-Phase Thermal and Molecular Mobility",doi:"10.5772/intechopen.89616",slug:"multi-field-synergy-process-for-polymer-plasticization-a-novel-design-concept-for-screw-to-facilitat",body:'\nPolymer plasticization is a complex process with many uncertain variables, which involves phase transfer and viscoelastic behavior. The nonlinear effect of polymer plasticization is a multidisciplinary engineering science problem that includes heat transfer, rheology, and flow dynamics among others. The thermal homogeneity and stability of polymer melts in this plasticization process is the key to determine the quality of products, especially for biodegradable nanocomposites or microcellular foam materials.
\nIn polymer processing, plasticization screw is an added unit operation that facilitates melting and homogenization of an initially heterogeneous physical system [1, 2]. In general, the temperature distribution is not uniform in the process of plasticization; this is due to significant friction heating and the low thermal conductivity of polymers. It is very important to optimize the structural parameters and working characteristics of the screw in order to enhance plasticization of polymers. The effect of barrel configurations and screw designs on heat and mass transfer has been investigated in the past and proved unquestionably important attributes for determining temperature uniformity and mixing effectiveness in extrusion and injection molding processes [3, 4, 5, 6, 7, 8]. Different from conventional screw, the new types of screw can be roughly divided into four categories: distribution screws, barrier screws, separator screws, and channel screws with variable sections. These reconfigured screws are stated to be better than a standard one. For example, Kelly et al. [6] developed a barrier-flighted screw with Maddock mixer to achieve good melting performance and low temperature and pressure fluctuations. Spalding [9] introduced a distributive melt-mixing type screw equipped with an Eagle mixer in injection molding process and obtained better melting capacity and higher mixing than a conventional screw. Shimbo et al. [10] disclosed a mixture system by combining Pin and Dulmage type screws and also reported their beneficial effect in kneading, homogenization, and ensuring stability of gas/polymer solution. Zitzenbacher et al. [11, 12] indicated that the shearing sections like axial and spiral Maddock elements and Z-elements are often used to improve the melt homogeneity by enhancing dispersive mixing. Rydzkowski [13] developed an autothermal screw-disc extruder to induce autothermal effect. Rauwendaal [4] noted a CRD mixing screw with wedge-shaped barrier region to generate elongational flow. In this way, the mixing ability improves under the condition of lower power consumption and viscous dissipation than shear flow. Also, the melt temperatures and pressure fluctuation reduce in the flow channel. Based on the elongational flow and volume transportation, Qu et al. [14, 15] proposed a novel vane plasticization system in place of screw one to create extensional stress. Their results showed that the plasticizing capacity improved with the decrease of power consumption in the vane extruder. Diekmann [16] analyzed the direct-drive single-screw extruders without gearing and results indicated that plasticization capacity increased in the direct-drive system. Besides, Jiang [17] introduced ultrasonic plasticizing in the extruder to achieve energy saving. And Qu et al. [18] introduced a vibrational force field in the screw plasticization system. Their results showed that mixing performance improved and extrusion pressure reduced.
\nThese studies may focus on mixing and rheology. However, heat transfer also plays a significant role in plasticizing. In the past, researchers paid little attention to understand heat transfer in viscous fluid. Understanding the mass and heat transfer processes in a plasticization system as a function of screw configurations is essential to further develop a more effective screw design to overcome some of the existing challenges. The properties of composites in the plasticization process also depend on the control of the velocity, temperature, shear, and pressure fields. Therefore, it is worth investigating the synergetic relationship, if any, between various physical fields in order to maximize the efficiency of the plasticization effect.
\nMixing a high-viscosity or high-molecular weight polymer melt leads to shear-induced overheating due to the large torque induced, required to unleash the polymer chain entanglements. The challenge in this case is to fabricate a screw configuration that facilitates polymer chain mobility in melt phase without inducing high shear and by facilitating effective transfer of the excess local heat out of the bulk of the polymer melt. Otherwise, the local overheating effect essentially results in unwanted heat loss and poor melt quality, subsequently, the polymer chains break down and thermosensitive polymers such as biopolymers may even be degraded.
\nIn order to overcome the challenges of an inadequate control of flow-thermal management for multicomponent melt, we explore the synergistic relationship and interaction mechanism between various physical fields for non-Newtonian viscous liquids such as polymer melts, with special emphasis on higher molecular weight thermoplastic resins, subsequently a torsion screw has been designed.
\nIn order to find out relationships among the velocity, velocity gradient, and temperature gradient fields in the plasticization process of polymer, we presented the mathematical expressions for quantitative analysis of multi-field synergy based on momentum conservation equation and energy conservation equation.
\nFrom the knowledge of polymer rheology, we have obtained the Navier-Stokes equation derived from momentum conservation equation in the form of Eq. (1).
\nEq. (2) is obtained by further expansion.
\nwhere ρ is the fluid density, v is the fluid velocity, t is the time, τ is the stress, P is the pressure, and g is the gravitational acceleration. The left-hand term of the equation is the inertia term, reflecting the increment of fluid momentum per unit volume in unit time. In the parentheses in Eq. (2), there is a dot product of velocity and velocity gradient, which can be expressed as
\nwhere α is the intersection angle between the velocity gradient and the velocity vector, and can be calculated according to Eq. (4)
\nHere defines the synergy angle α to represent the synergy between the velocity and the velocity gradient. In the range 0°–90°, the dot product Eq. (3) increases with decreasing α, which leads to the increase in momentum and enhancement of mass transfer. This means the interaction of velocity and velocity gradient has an effect on the momentum of the system, that is, the increment of momentum depends not only on the magnitudes of velocity or velocity gradient, but also on the overall synergy between velocity and velocity gradient.
\nWhen the synergy angle α becomes zero, the flow is a pure elongational one, and if it becomes 90°, the flow is a pure shear one. Most notably, it is generally known that the effect of elongational flow on mixing is more strong than that of shear flow [19, 20, 21, 22, 23, 24], which provides evidence for the feasibility of field synergy analysis. Therefore, the synergy relationship provides a new perspective to understand the polymer mixing.
\nFrom Eqs. (2) and (3), we can also conclude that the pressure gradient is affected by the synergy angle α when the stress and gravity terms are invariable. In other words, the synergistic effect of velocity and velocity gradient can reduce pressure loss and energy consumption, which is of great significance in Newtonian fluid flow. However, for most polymers, which are non-Newtonian in nature, the pressure term has little effect on mechanical power and energy consumption due to its very high viscosity.
\nAlmost all polymer processing unit operations require heat transfer processes such as energy exchange, heating, and cooling to facilitate phase-to-phase thermal and molecular mobility. Therefore, the study of energy balance and distribution has special significance in the process of melt flow. It is well known that the general energy conservation equation in the flow field can be represented in the form of Eq. (5).
\nBy further expansion, we obtain Eq. (6) as follows.
\nwhere ρ is the fluid density, CV is the constant-volume specific heat, T is the fluid temperature, v is the fluid velocity, t is the time, τ is the stress, P is the pressure, and K is the heat transfer coefficient. The left-hand term of the equation is the changing rate of internal energy, reflecting the change of heat caused by the temperature variation per unit time at a point in the flow field. Moreover, in the parentheses, there is also a dot product of velocity and temperature gradient. The latter term signifies the interaction between velocity and temperature gradient, and demonstrates that this interaction parameter has an effect on the thermal energy of the system, that is, the change of internal energy depends not only on the velocity field and temperature gradient field, but also on the overall synergy between the velocity field and the temperature gradient field. The dot product in the parentheses in Eq. (6) can be further expressed as
\nwhere β is the intersection angle between the temperature gradient and the velocity vector, and can be calculated according to Eq. (8)
\nHere is defined as the synergy angle α β representing the synergy between the velocity and the temperature gradient. In the range 0°–90°, the dot product (Eq. (7)) increases with decreasing β. When the viscous dissipation power is constant, a small β contributes to a large heat transfer coefficient K, which leads to enhanced heat transfer and temperature uniformity.
\nIn the case of the problem of a two-dimensional flat-plate steady-state boundary layer, Guo et al. [25, 26] have simplified the energy conservation equations into the dimensionless forms
\nwhere \n
where μ is the fluid viscosity, Cp is the specific heat capacity at constant pressure, λ is the thermal conductivity, and δt is the characteristic dimension, which refers to the thickness of the thermal boundary layer. From Eqs. (9) and (10), we can notice that an increase in interaction between the temperature gradient and the velocity fields increases the Nusselt number and the coefficient of local heat transfer, and consequently enhances the overall heat transfer. These synergy equations suggest a new approach to enhance heat transfer of the polymers with poor heat conductivity, namely by increasing the dot product in the integral (Eq. 9).
\nBy understanding the multi-field synergy effect in the heat and mass transfer process of polymer plasticization, we can construct a specific flow field so that the directions of velocity field and temperature gradient field are no longer perpendicular, and the flow field movement is more random. The schematic diagram is shown in Figure 1. In this way, it can facilitate phase-to-phase thermal and molecular mobility, so as to significantly improve heat transfer and molecular mixing, particularly for highly viscous multicomponent polymer melts with Bio or Nano filler. Based on this method, we can design a special screw configuration to divert the fluid particles and obtain the desired flow field. Here, we propose a new type of screw element, namely, torsion element, to stimulate the spiral or torsional flow, which is the most common way of disturbing or changing flow direction in nature.
\nThe synergy between velocity field and heat flow field: Parallel movement (a) and spiral movement (b).
In the following sections, we develop a novel torsion element-induced torsional flow into the flow field by adapting the field synergy principle. Then, we establish a three-dimensional physical and mathematical model with finite element method (FEM), and present results of computational fluid dynamics (CFD) simulations of the flow and heat transfer of a viscous polypropylene (PP) melt in the screw with torsion elements to confirm this field synergy method and compared them with the conventional screw in common use today.
\nThe geometrical configuration of the proposed torsion element is shown in Figure 2. The torsion channels are divided into N parts along the circumferential direction by torsion flights. Between every two adjacent torsion flights, there are two surfaces twisted by 90°along the axial direction. When polymer flows over the torsion channel, it is expected to undergo a torsional rotation (tumbling) under the forces generated from viscous friction with barrel wall and with the steering between two 90° twisted surfaces. As a result, spiral-shaped or torsional-shaped flow may occur in the torsion channel. In consequence, the intersection angle between the velocity and the heat flux will decrease to less than 90° compared with that in the standard screw channel, and then the synergic effect between the velocity vector and the temperature gradient will be improved.
\nThe geometrical configuration and flow line of particles for a torsion element.
Six screws with same length and diameter (designated by alphabetical A to F as shown in Figure 3) were employed in this work to verify the synergic effect of torsion element. Screws were constructed of two kinds of polymer plasticization elements: the torsion element and the screw element. Screws A to D had six torsion elements with regular arrangement in different orders. As control subjects, screw E is a conventional screw without torsion element and screw F is a torsional screw without screw elements. Table 1 presents a summary of the geometric parameters of simulation models.
\nThe geometrical configuration of various screws (with screw elements and torsion elements).
Parameters | \nDimensions (mm) | \n
---|---|
Length of screw | \n180 | \n
Diameter of screw | \n30 | \n
Diameter of barrel | \n30.4 | \n
Length of single torsion element | \n10 | \n
Lead of screw element | \n30 | \n
Inner diameter of screw | \n25.8 | \n
Geometric parameters of simulation models.
In this case, we assumed that the polymer fluid had non-isothermal transient laminar flow and was incompressible. No-slip conditions were adopted at the boundary. Polypropylene (PP) was chosen to be the model polymer due to its common use in polymer processing. Compared with viscous force, the inertial force can be neglected due to the high viscosity of PP. Therefore, the governing equations representing the flow field in this situation are shown in the form of Eqs. (11)–(13).
\nContinuity equation:
\nMomentum equation:
\nEnergy equation:
\nThe apparent viscosity of PP was described by the Carreau-approximate Arrhenius model (Eq. 14), which match most polymers, to consider the factors of both temperature and shear.
\nThe physical characteristics of the PP and screw material are listed in Tables 2 and 3, respectively. The choice of the polymer affects only the constants in the constitutive equation (Eq. (14)). Moreover, the Carreau-approximate Arrhenius model has been already validated for most polymer melts (e.g., polystyrene, polyethylene, and polyurethane.). Therefore, we assume modeling and simulated results based on the above conditions, which are generally applicable for most of the materials used in polymer processing.
\nDensity ρ | \n735 kg/m3 | \n
Thermal conductivity λ | \n0.15 W/(m·K) | \n
Specific heat capacity Cp | \n2100 J/(kg·K) | \n
Zero shear viscosity η0 | \n26,470 Pa·s | \n
Non-Newtonian index n | \n0.38 | \n
Natural time t | \n2.15 s | \n
Coefficient of temperature sensibility B | \n0.02 K−1 | \n
Reference temperature T0 | \n513 K | \n
Physical parameters of the PP.
Density ρ | \n8030 kg/m3 | \n
Thermal conductivity λ | \n16.27 W/(m·K) | \n
Specific heat capacity Cp | \n502.4 J/(kg·K) | \n
Physical parameters of the screw.
In our work, ANSYS Polyflow 17.0 packaged software (ANSYS, Inc.) was adopted in the simulations. The 3D mesh systems for the screw and the fluid were created using the mesh superposition technique (MST). Figure 4 shows the 3D model for screw E. The fluid model and screw model were implemented through mesh refinement by hexahedral and tetrahedral elements, respectively. In addition, progressively refined meshes for the screw and fluid models were constructed to ensure that the simulation results were mesh-independent. Different screws had the same mesh refinement setting and, with the same fluid model, simulation results were displayed in the grid of fluid domain. Table 4 gives the flow and thermal boundary conditions used in this case.
\nThree-dimensional physical model of screw E.
Location | \nFlow boundary conditions | \nThermal boundary conditions | \n
---|---|---|
Inlet | \nSetting zero pressure | \n513 K | \n
Outlet | \nSetting zero pressure | \nHeat outlet | \n
Barrel wall | \nNo-slip wall | \n513 K | \n
Screw wall | \nScrew speeds: 40,60,80,100,120 r/min | \nFree boundary | \n
Boundary conditions.
Firstly, we investigated the axial melt temperature distribution by selecting different radial reference lines for these six screws as shown in Figure 5. From all the six screws, we can find that the temperature fluctuations decrease by the effect of torsion elements and the temperature difference between melt and barrel wall in the position of torsion elements is smaller than that of the position of screw elements. The reason for this phenomenon is heat transfer enhancement caused by the synergy effect between velocity and temperature gradient. We will prove this in the next section. Figure 6 shows the radial melt temperature distribution for screw B in the position of torsion and screw elements. For the position of torsion element, almost all the fluid is in a high-temperature region, more than 500°C, while the radial temperature for most fluid in the screw channels is below 500°C. Results indicated that the radial temperature difference in the position of torsion element is much lower compared with that of the position of screw elements, no matter before or after the torsion element. It can be concluded that the torsion element can achieve more uniform temperature distribution than the screw element.
\nRadial and axial temperature distribution for the different screws at 40 r/min. (1) r = 14.5 mm; (2) r = 14.0 mm; (3) r = 13.5 mm; (4) r = 13.0 mm.
Temperature contours (left) and melt temperature profiles (right) across the melt flow with the magnitude of fluctuations for screw B at different x-positions at 40 r/min.
In order to verify the field synergy effect, we calculated the mean field synergy angle between temperature gradient and velocity fields and the Nusselt number at different screw speeds for these six screws as shown in Figure 7. It can be seen that the Nusselt number increases with screw speed, which is a well-known fact. Results also indicated that conventional screw E without torsion elements has the largest mean field synergy angle and smallest Nusselt number, while screw F without screw elements has the smallest mean field synergy angle and largest Nusselt number, which means the smaller the field synergy angle, the larger the Nusselt number. However, there are little difference of values in field synergy angle and Nusselt number for the screws A, B, C and D. This is because all these four screws have the same six torsion elements, which bring about almost the same influence on the variations of field synergy angle, that is, the arrangement of torsion elements in the screw has little effect on the field synergy angle. Therefore, it can be inferred that the screws equipped with torsion elements show better convective heat transfer capacity compared with the conventional screw, which then bring about a good melt temperature uniformity.
\nA plot of the mean field synergy angle (left) and Nusselt number (right) versus screw speed for various screws.
In addition, Figure 8 shows the local field synergy angle and the local heat transfer coefficient at different cross sections for screw A. Results also indicated that the local regions with torsion elements have larger heat transfer coefficients and smaller field synergy angles than the local regions with screw elements. Besides, the local convective heat transfer was found to be inversely proportional to the local field synergy angle between velocity and temperature gradient.
\nA plot of the local field synergy angle versus the local heat transfer coefficient (left) and the local field synergy angle contours at different cross sections (right) for screw A at a screw speed of 80 r/min.
The contours of the local field synergy angle at different positions further show that most of the local synergy angle distributions at the cross sections of torsion elements alternate between larger and smaller synergy angles, while those at the cross sections of screw elements are close to 90.0°.
\nFigure 9 shows the dependence of the Nusselt number on the field synergy angle for various screw speeds and shows that the Nusselt number increases with decreasing field synergy angle. It can be inferred that the Nusselt number is inversely interrelated with the synergy angle β. When the confidence level is 95%, its value is limited to a relatively narrow confidence band. Furthermore, the Pearson correlation coefficient is about −0.7, which indicates a strong negative correlation. These results demonstrate that the coupling relationship between temperature gradient and velocity fields has a significant effect on the convective heat transfer of the polymer itself in a polymer plasticization process.
\nThe dependence of the Nusselt number on the field synergy angle for various screw speeds. The inset is the Pearson correlation coefficient.
Accordingly, the field synergy principle is able to explain the enhancement of heat transfer brought about by the torsion elements.
\nAs stated previously, the synergy effect between velocity and temperature gradient in the torsion element is realized by constructing a spiral or torsional flow in the flow field. In order to verify the existence of torsional-spiral shaped flow, we investigated the fluid flow characteristics in the region of both torsion and screw elements as shown in Figure 10.
\nThe streamline contours in screws A, B, and E at a screw speed of 40 r/min in the axial direction (a) and the cross section of the torsion element (b).
Figure 10(a) shows the streamline contours along the axial direction for screws A, B, and E. We can see that spiral-shaped flow occurs in the position of torsion elements for both screws A and B, which cannot be achieved in screw E. In this spiral-shaped flow, the velocity directions are changing along the flow direction and mass transfer is enhanced in the radial direction, that is, the synergy angles between velocity and thermal flow fields are no longer perpendicular to each other, which confirms the assumption shown in Figures 1 and 2. Figure 10(b) shows the cross sections in the torsion and screw elements. And results indicated that there are vortexes in the torsion channel, while there are just plug flows without radial convection in the screw channel.
\nTherefore, it can be inferred that the torsion element improves the synergy between velocity and temperature gradient by inducing torsional flow, and then enhances heat transfer in the screw plasticization process.
\nThe performance of screw with torsion elements in the polymer plasticization process has been verified though numerical analysis. Furthermore, the mixing and heat transfer performances of the newly designed screw configuration based on field synergy principle were evaluated through extrusion runs and experimental data. Materials used were polypropylene (PP) and polystyrene (PS) bi-phase polymer composite mix.
\nFigure 11 shows the particle size distribution of PS (PP: PS = 100:10, % wt/wt) at the screw outlet; more specifically, Figure 11(a) is that of torsional screw with six torsion elements and Figure 11(b) is that of conventional screw without torsion element. The particle size distribution of PS fits Gaussian distribution. On the other hand, the relative frequencies of particle size in torsion screw are more concentrated in a narrow range [0–50 μm] than those in conventional screw. This can be further validated from the scanning electron microscope (SEM) pictures shown in Figure 11(a) and Figure 11(b). SEM pictures clearly show that the particles of PS in torsional screw are finer and the particle sizes are smaller than those in conventional screw. Average particle size (Dn), the maximum value, minimum value, and standard deviation of particle size of PS are also calculated and summarized in Figure 11. Results indicate that the Dn, the standard deviation, and maximum value of particle size in torsional screw are much smaller than those in conventional screw. Therefore, the torsional screw with six torsion elements shows good mixing performance.
\nParticle size distribution in a PP/PS bi-phase composite in the outlet of the screws.
Figure 12 shows the variation of heat transfer coefficient K with screw speed and the outlet radial temperature distribution at 60 r/min for torsional screw and conventional screw. From the heat transfer coefficient K, we can see that the K value improves with screw speed, which is in agreement with Figure 7. More interestingly, the K value for torsional screw is higher than that for conventional screw, indicating that the torsional screw with six torsion elements shows better heat transfer capability than that of the conventional screw. Therefore, we can confirm that the configuration of torsion element designed based on field synergy principle can in fact enhance heat transfer, which is in agreement with the simulation results.
\nHeat transfer coefficient (left) and outlet radial temperature distribution (right) of the plasticization system for screws.
From the outlet radial temperature distribution, it can be found that the melt temperature in the center of die is higher than the temperature near the barrel walls, which is due to the viscous dissipation of polymers. Therefore, an effective heat transfer is needed in order to evenly distribute the thermal energy among the polymer melt. In addition, the radial temperature difference of torsional screw is 15°C, whereas the radial temperature difference of conventional screw is 20°C, which is 25% higher than that of torsional screw. As the experiment data indicate that the radial temperature difference of melt decreases in the torsional configured screw, it can be concluded that the torsional configuration has a superior heat and mass transfer performance to achieve better temperature distribution than traditional screw, which is also in agreement with the simulation results.
\nOne of the fundamental questions of non-uniform heat and mass transfer in viscous fluid was addressed by proposing a radial torsional flow pattern, by designing a torsion element and validating the same in a melt-phase polymer extrusion process. The synergistic interaction mechanisms between velocity and velocity gradient and velocity and temperature gradient have been investigated by considering theoretical and numerical aspects, which provides a new perspective to understand the polymer processing. Considering the multi-field synergy, a new design concept of torsion screw configuration has been proposed to facilitate phase-to-phase thermal and molecular mobility.
\nThe spiral-shaped torsional flow induced by torsion configurations in a polymer channel changes the radial velocity direction, which in turn improves the interaction between velocity and temperature fields and helps to achieve good heat transfer and temperature homogeneity. The new torsion elements and their arrangement provide a novel pathway to achieve good thermal management of polymer melt by enhancing multi-field coupling. These results can be achieved to guide the screw design used for preparing high-performance composites, especially heat-sensible and biodegradable nanocomposites or microcellular foam controlled by temperature.
\nThis work was supported by the National Natural Science Foundation of China (grant number 51576012). Support from China Scholarship Council is also gratefully acknowledged for Ranran Jian’s joint PhD grant. fluid density, kg/m3 fluid velocity, m/s stress, Pa pressure, Pa constant-volume specific heat capacity, J/(kg·K) constant-pressure specific heat capacity, J/(kg·K) thermal conductivity, W/(m·K) fluid temperature, K Cartesian coordinates, m velocity boundary layer thickness, m thermal boundary layer thickness, m velocity vector, m/s velocity gradient vector, s−1 temperature gradient vector, K/m mean velocity of fluid, m/s fluid viscosity, Pa·s heat transfer coefficient, W/(m2·K) Reynolds number Euler number Prandtl number Nusselt number synergy angle between the velocity gradient and the velocity, ° synergy angle between the temperature gradient and the velocity, ° pressure, Pa apparent viscosity, Pa·s zero shear viscosity, Pa·s shear rate, s−1 natural time, s temperature sensibility coefficient, K−1 non-Newtonian index reference temperature, K
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