A Numerical Study on Heat Transfer and Friction in Rectangular Channel with Inclined Perforated Baffles

Abstract

A three dimensional numerical study has been applied to predict the turbulent fluid flow and heat transfer characteristics for the rectangular channel with different types of baffles. Four different types of the baffles are used. The inclined baffles have the width of 19.8 ㎝, the square diamond type hole having one side length of 2.55 ㎝, and the inclination angle of 5o. Reynolds number is varied between 23,000 and 57,000. The SST k -ω turbulence model is used in the present numerical study. The validity of the numerical results is examined with the experimental data. The numerical results of the flow field depict that the flow patterns around the different baffle type are entirely different and it significantly affects the local heat transfer characteristics. The heat transfer and friction factor depend significantly on the number of baffle holes. It is found that the heat transfer enhancement of baffle type Ⅱ (3 hole baffle) has the best values.