Indian Journal of Science and Technology

Abstract

Background/Objectives: In this paper, a complete study and CFD analysis is performed on triangular manifolds and heat sink assembly with the help of different input parameters. The objective of the study is to get exact understanding of the temperature variation, pressure drop, and velocity variations at inlet and outlet of manifold when we pass fluid from one manifold to another by giving different heat inputs to the heat sink. CFD analysis for the simulation purpose is performed on the geometry for the evaluation of heat transfer coefficient, Nusselt number and Reynolds number. Methods/Statistical Analysis: In this study, for simulation CFD analysis of the geometry with different input parameters (velocity, density, viscocity specific heat, thermal conductivity, heat flux) is a simple method applied for the for different temperature and pressure drop values at inlet and outlet. Three arrangements for the water flow (U, S, and P) are designed in the manifolds through the heat sink. Four heat input values (5.06W, 7.53W.10.12W, 12.65W) are selected for the simulation. Findings: CFD investigation was performed with microchannel setup having 20 rectangular channels of 0.0005m width, 0.0025m depth and 0.2m length with two triangular manifolds. Five input parameters (velocity, density, viscosity. specific heat, and thermal conductivity) and 24 numbers of experiments were performed with one temperature value at inlet (25°C) for the comparison of temperature and pressure drop values. After the analysis, observation was found that temperature had different values at outlet of manifold in each fluid flow arrangement (U, S and P type) the Reynolds number range is varying from 599 to 899.The results show that the fluid flow was better in U type fluid flow arrangement and the value of heat transfer coefficient (96.57w/m2c to 161.52w/m2c) is highest (2-3%) in comparison to S and P Type simulation. Applications: Triangular Manifolds are designed for providing uniform fluid flow and efficient heat transfer rate through the microchannel heat sink. As according to observation observed in the study, triangular manifolds have better heat transfer rate and it can be integrated in the next generation high temperature reactors. The manifolds are capable for use in fuel cells, liquid rocket engines, commercial heating and cooling and in automobiles.

Keywords: Heat Transfer Rate, Microchannel Heat Sink, Nusselt Number, Reynolds Number, Triangular Manifolds