A Review on Enhancement of Heat Transfer Techniques

Abstract

Heat transfer enhancement techniques are very important to save energy and using of optimal energy sources. It is the process of improving the performance of a heat transfer system. In the past decades, heat transfer enhancement technology has been developed and widely applied to heat exchanger applications such as automobiles, chemical industry and process industry. Much effort in the past decades has been aimed to provide economical methods for improving the performance of heat exchanger. Active, passive and compound techniques are used for the enhancement of heat transfer. Nowadays, there have been a large number of attempts to reduce size and cost of heat exchangers, in reducing size and cost of a heat exchanger are basically the heat transfer coefficient and pressure drop.The performance of heat exchangers is essential for reducing size of the system and to make the system more compact and the performance depends on the rate of heat transfer. The high rate of heat transfer is desirable because, it reduces the fuel consumption. A wide range of experimental, theoretical and numerical studies has been performed on the effect of different parameters like Reynolds number, Nusselt number, Concentration of nanofluids and size of nano particle. The main objective of this research paper is to study the heat transfer enhancement using passive techniques as these are economical and no external additions are required.