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Numerical Studies on Convergent Tube-in-Tube Heat Exchanger

HHeat exchangers have been used since the start of industrialisation, and since then have been modified in a plethora of complex and intricate ways to suit the needs of the corresponding application, but in this paper a simple modification on the existing design has been investigated numerically, which has proven to be effective. A standard tube-in-tube heat exchanger has been modified such that the external tube tapers (converges) to a smaller diameter. The inner tube carries the cold working fluid which absorbs the heat energy carried by the fluid in the outer tube. A numerical simulation has been carried out, taking into account the mass flow rate, fluid temperatures, heat transfer etc., which are governed by fundamental heat transfer equations. The results of the simulation are used to analyse the effect of this modification (convergent tube) on the efficiency of the heat exchanger, which has been found to increase significantly along with the rate of heat transfer.