Chapters authored
Performance Evaluation Criterion of Nanofluid
In this chapter, we will discuss the increase of heat transfer as well as the increase in pressure drop to determine whether nanofluid is feasible for use in practical applications. Addition of nanoparticles will change the thermal properties of the cooling fluid, by calculation with performance evaluation criterion (PEC). If PEC < 1, then the heat transfer performance is less than the pumping power, so the system is not feasible for use in increasing heat transfer. If PEC = 1, then the heat transfer performance is smaller equal to the pumping power so that the system does not have an impact on increasing heat transfer. If PEC > 1, then the heat transfer performance is higher than the energy used to drive the fluid or pumping power, and then it can be accepted as a solution to the problem of increasing heat transfer, so that the system is feasible for use in practical applications.
Part of the book: Microfluidics and Nanofluidics
The Combined Method to Improve Heat Transfer Coefficient on Heat Exchanger
The heat transfer process occurs all the time around us, from simple household appliances to equipment used in large industries. Energy efficiency in large-scale use in industry is necessary because it is related to company profits. One way to save energy use in heat exchangers is to change the thermal properties of the cooling fluid. The addition of particles of the nanometer size (nanofluids) in the working fluid will improve the performance of the heat exchanger, and the main goal is the highest efficiency. In addition, there is another method to increase the heat transfer rate, namely, by vibrating the cooling fluid. This chapter will discuss combining nanofluids and ultrasonic vibrations in heat transfer processes in heat exchangers. The application of these two methods simultaneously gives rise to several advantages to the heat transfer system, will promote higher heat transfer, and at the same time function as cleaning of scale/deposits that often appear on the surface of the heat exchanger.
Part of the book: Heat Transfer