<p>This study presents the effects of adding an array of protuberances in a microchannel for heat transfer enhancement. The presence of mini-channels increase the overall heat transfer area and boost the mixing effect near the solid-fluid interaction therefore it can remove more heat than conventional mini-channels without protuberances. &nbsp;A numerical study proved that the presence of protuberances in a mini-channel increases the heat transfer performance by disturbing the relative fluid motion near the solid wall. The numerical simulation was performed with three different protuberances arrays: aligned, staggered, and angular. Each array consists of a thin flat plate with hemispherical shape; the working fluid and the solid material were water and copper respectively. The study also include the effect of different Reynolds numbers: 1,000, 1,500, and 2,000. To determine the effect on the heat transfer enhancement three heat inputs were applied in the numerical simulation; these values were 1W, 3W, and 5W. The study was compared with a simple microchannel with non-protuberances in order to analyze the performance of the microchannel in terms of heat removal and pressure drop. For heat transfer performance, the best array was the staggered array with a maximum heat removal increase of 5.26 percent. In terms of pressure drop performance, the best array was the aligned array with a maximum increase of 34.73 percent</p>

Effect of Protuberances in the Heat Transfer Enhancement in Mini-Channels

Paper Proceedings: https://asmedigitalcollection.asme.org/HT/HT2021/volume/84874

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