Abstract
The aim of this study is to investigate the heat transfer characteristics of turbulent airflow phenomena in a rectangular micro-channel in presence of two plane shaped (type-1) and diamond shaped (type-2) baffles which will help to develop various heat exchanger models. Finite volume method has been used to solve the governing equations and the FLUENT software has been employed to visualize the simulation results. For both the baffles, the profile of flow structure, normalized velocity profile, normalized friction factor and average Nusselt number have been investigated with the variations of Reynolds number ranges between [10,000-50,000]. In terms of fluid flow and heat transfer phenomena, it has been found that in the presence of diamond shaped baffles (type-2) are more convenient than plane shaped baffles.
Highlights
Over the last few years, thermal efficiency of a flow has become one of the major issues in various engineering and scientific fields such as air conditioners, room coolers, chemical reactors, etc [1,2,3,4,5,6,7]
Based on the experimental geometry of Dutta et al [17], numerical studies on turbulent air-flow were performed by Saim et al [18] using plane baffles for inclined angle 450 and 600
The results of this work indicate that the existence of ribs enhances the friction factor and Nusselt number significantly
Summary
Over the last few years, thermal efficiency of a flow has become one of the major issues in various engineering and scientific fields such as air conditioners, room coolers, chemical reactors, etc [1,2,3,4,5,6,7]. In a rectangular micro-channel with two periodically mounted square baffles, Valencia et al [14] numerically studied the turbulent air-flow and heat transfer phenomena using the standard k-ε turbulence model and found that the presence of baffle causes the enhancement of heat transfer. Behnampour et al [23] numerically investigated the effect of using rectangular, triangular and trapezoidal ribs on laminar heat transfer of water/AgO nanofluid flow for nanoparticles volume fractions of 0–4% in a rectangular micro-channel. They observed that the rectangular rib causes the maximum changes in velocity profile along the central line of flow and the triangular rib provides the best rate of thermal enhancement factor
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