The enhanced heat transfer mechanism and parameter optimization of an interrupted microchannel heat sink with rectangular ribs (IMCHS-R) was numerically studied for Reynolds number ranging from 100 to 900, using ANSYS Fluent. Interrupted microchannel heat sinks with different kinds of rectangular ribs having different width, length and locations were compared with a straight microchannel and microchannel interrupted chambers. The results indicated that, the heat transfer and flow resistance were mainly strengthened at the sudden converging area and narrow channels, and the secondary flow area did not show a positive effect on heat transfer. The IMCHS-R with W2/W1=0.3 and L2/L1=0.7 presented the best behavior from both PEC and Stot-ave, at Re=500-700. The heat transfer performance can be improved 2.0 times compared to the straight microchannel heat sink and the PEC can reach above 1.5. However, the rib location has a little effect on the enhanced heat transfer performances.

中文翻译：

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带肋间断微通道散热器的层流和传热参数研究

使用ANSYS Fluent对雷诺数在100至900之间的数值进行了数值研究，研究了矩形肋间断微通道散热器（IMCHS-R）的增强传热机理和参数优化。将具有不同宽度，长度和位置的不同矩形肋的中断微通道散热器与直的微通道和微通道中断室进行了比较。结果表明，传热和流动阻力主要在突然收敛的区域和狭窄的通道处增强，而二次流动区域对传热没有积极作用。W2 / W1 = 0.3和L2 / L1 = 0.7的IMCHS-R在Re = 500-700时表现出PEC和Stot-ave的最佳性能。传热性能可以提高2。是直型微通道散热器的0倍，而PEC可以达到1.5以上。但是，肋的位置对增强的传热性能影响很小。