CFO study of an oscillatory flow across heat exchanger

Faizal Edzuan, Edzzry Indrawan (2020) CFO study of an oscillatory flow across heat exchanger. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study focuses on the study of oscillatory flow at various drive ratios across a heat exchanger by using CFD modelling. The primary goal of a heat exchanger is to exchange heat between two fluids, hence the performance of the heat exchanger in terms of heat transfer is significant. Fluid flow can be of either steady flow, where fluid exits the system after heat is exchanged, or of oscillatory flow , where the fluid stays in the system oscillating back and forth periodically in a heat exchanger. The geometry model for the heat exchanger was modelled using Ansys Design Modeler. Grid independency test was conducted to determine the appropriate grid size to be used when solving the model. Four models of oscillatory flow of different DR were solved using Ansys Fluent. The results obtain ed was compared with theoretical calculations to determine the validity. Several contour plots of velocity, vorticity, temperature, and pressure were plotted. Heat transfer performance was analyzed by obtaining the surface heat transfer coefficient at the tubes and thus obtaining the heat transfer rates. Higher drive ratio, DR, provides greater h eat transfer within the heat exchanger and the tube banks due to the turbulence generation. Since oscillatory flow has yet to have conclusive equations to model the heat transfer, steady flow heat transfer equations are used.

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