Experimental and Numerical Analysis for enhancement of Heat Transfer in a double pipe Heat Exchanger with varying Cut Twisted Tapes and Ferric Oxide Fe3o4 Nano Fluids

Abstract

ABSTRACT newlineLatest technological transformations in the areas of micro-electronics, newlineautomobiles and micro manufacturing systems require compact equipment, high rate of newlineheat transfer with lowest pumping power and high effectiveness of heat transfer. newlineConventional fluids have low thermal conductivity. Because of this reason, the cooling newlinecapabilities are not being met all over the world. Despite of substantial research carried newlineout by several researchers, significant improvements in the cooling capabilities were newlinelacking with the usage of conventional fluids. Even though some break through has been newlineachieved with the suspension of solid particles of the size of micrometer or millimeter in newlinethe base fluids, the problem of clogging of these particles in the narrow channels caused newlinea hindrance to use this method in the heat transfer applications. Momentum has been newlinegained in this area with the advent of synthesizing of Nano particles by Choi and newlinesuspending them in various base fluids. He observed that there is an enhancement of newlinethermo-physical properties by suspending nano sized particles in the carrier fluids like newlinewater, ethylene glycol, oil etc. newlineCompact and light weight heat exchangers are required in applications where newlinespace is the limitation like in the case of automobiles and aero planes. For such newlineapplications, one of the ways to enhance the rate of heat transfer is to adapt various newlineaugmentation techniques of heat transfer. Selection of appropriate nano fluid for the newlinerequired application is one of the ways to solve this problem. Usage of inserts to enhance newlinethe rate of heat transfer without any external power is another method. Utilizing the newlinehybrid effect of nano fluids and inserts would be a better combination when compared to newlinethe individual methods stated above. newline newlinePrime objective of this work is to utilize the hybrid effects of Ferric Oxide newline(Fe3O4) Nano fluids and Varying Cross section cut twisted tapes (VCSCTT) to improve newlinethe performance of a double pipe heat exchanger. In the present work, water based Ferric newlineOxide