Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 161, Issue -, Pages -Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2020.106721
Keywords
Heat exchange systems; Microchannel heat sinks; Channel geometry; Groove shapes; Fluid flow characteristics; Heat transfer enhancement
Categories
Funding
- National Natural Science Foundation of China [51506048]
- Science Foundation for Outstanding Young Teachers in Institutions of Higher Education in Henan Province [2019GGJS054, 2017GGJS050]
- Natural Science Foundation of the Henan Administration of Coal Mine Safety [HN15-61]
- Natural Science Foundation of the Education Department of Henan Province [15A470002]
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Different groove shapes were studied to improve the overall performance of microchannel heat sinks, with the conclusion that arranging grooves on channel sidewalls can greatly enhance performance. Triangular grooves were found to be the optimal structure within a certain range of Reynolds numbers, while water-droplet shaped grooves offered significant advantages at higher Reynolds numbers.
Microchannels are effective heat sinks for integrated electronic circuits. However, it remains unclear what form of channels will be most effective in improving the overall performance of microchannel heat sinks. The effect of channel geometry on overall performance was studied to understand the fluid flow and heat transfer characteristics of microchannel heat sinks having groove sidewalls. Five types of silicon-based microchannel heat sinks were designed, and the periodic grooves arranged on channel sidewalls were rectangular, triangular, trapezoidal, water-droplet, and semicircular in shape. A three-dimensional computational fluid dynamics model was developed, validated, and used to optimize the geometric structure. Comparisons were made between different groove shapes in order to determine the optimum structure. The results indicated that the overall performance can be greatly improved by arranging grooves on channel sidewalls. The significant improvement of overall performance can be achieved with all the groove shapes except rectangles. When the Reynolds number falls within the range from 194 to 610, triangles are the optimum groove structure in terms of the level of the maximum heat transfer performance improvement, but with a significant increase in pressure drop. Water-droplet shaped grooves offer many advantages and improvements that make them the preferred choice for the development of microchannel heat sinks. They offer significant advantages as an effective heat transfer enhancement structure at higher Reynolds numbers, and allow for the lowest pressure drop at lower Reynolds numbers due to the vortexes formed inside the grooves.
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