Study on the flow and heat transfer of a nanofluid hybrid jet impinging on a corrugated microchannel heat sink

• Published in: International journal of thermal sciences Vol. 194; p. 108590
• Main Authors: Tang, Zhiguo, Yin, Chao, Sun, Ran, Cheng, Jianping
• Format: Journal Article
• Language: English
• Published: Elsevier Masson SAS 01.12.2023
• Subjects: Corrugated microchannel heat sink; Gradient decreasing wavelength; Jet impingement; Nanofluid; Temperature uniformity; Gradient decreasing wavelength; Temperature uniformity; Corrugated microchannel heat sink; Jet impingement; Nanofluid
• ISSN: 1290-0729; 1778-4166
• DOI: 10.1016/j.ijthermalsci.2023.108590

Temperature uniformity in high-heat-flux electronic devices is an important concern in the field of micro-scale enhanced heat transfer. In this study, a novel hybrid jet impingement/corrugated microchannel heat sink (JICMCHS) is proposed, in which the wavelength of the corrugated microchannel is decreased steadily in the flow direction and water-Al2O3 nanofluid is used to enhance the heat transfer in the microchannel, especially in its outlet region, in order to improve the temperature uniformity throughout the heat sink. The fluid flow and heat transfer characteristics of JICMCHS with different parameters of its corrugated structure, jet Reynolds number, and volume fraction of nanofluid particles are investigated numerically. The results indicate that compared with jet impingement/flat microchannel heat sink (JIFMCHS), JICMCHS can enhance the fluid flow and heat transfer of the heat sink, improving the performance evaluation criterion (PEC) by up to 4.1% and temperature uniformity by 44% over that of JIFMCHS. As the wavelength decreasing ratio (r) or the wave amplitude ratio (h/B) increases, the temperature uniformity of the bottom surface of the heat sink gradually improves. When r = 0.8 and h/B = 0.2, the best temperature uniformity can be achieved. Increasing the jet Reynolds number (Re) and the volume fraction of nanofluid particles (φ) both enhance the heat transfer and significantly improve the uniformity of the whole heat sink. However, both lead to an increase in the flow resistance of the nanofluid and a decrease in the PEC of the JICMCHS. •A novel hybrid jet impingement/corrugated microchannel heat sink is proposed.•An increase of r or h/B of the heat sink improves the uniformity of temperature.•An optimized JICMCHS can improve the temperature uniformity by 44% over JIFMCHS.•The performance evaluation criterion of JICMCHS is up to 4.1% greater than JIFMCHS.