In the present study, conjugate heat transfer and fluid flow performance of microchannel heat sink has been investigated using dimensionless parameters. Novel ribs of four different types are introduced on the side walls of channel, which include trapezoidal ribs, rectangular ribs, hydrofoil ribs, and elliptical ribs. The performance evaluation has been conducted by comparing friction factor ( f ), Nusselt number (NuNu), fluid bulk temperature (Tf{T_{f}}), wall shear stress ( τ ), field synergy number (FcFc), irreversible heat loss (Qd{Q_{d}}), and Bejan number (BeBe) in a Reynolds number, ranging from Re=100\mathit{Re}=100 to Re=1000\mathit{Re}=1000. The results revealed that the addition of these novel ribs are helpful in improving the overall thermal and hydraulic performance of microchannel heat sink. From the results of Bejan number, it has been revealed that more than 96 % of losses are because of heat transfer. However, at low Reynolds number, the frictional losses can be neglected, because of very low fluid velocity. Moreover, it has been revealed that synergetic relation between velocity and temperature gradient becomes weaker at higher Reynolds number. Furthermore, it is clear from this study that elliptical ribs performed better in thermal aspects, whereas hydrofoil ribs performed better at hydrodynamic aspects.

中文翻译：

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侧壁带肋的微通道散热器性能的水热研究

在本研究中，使用无量纲参数研究了微通道散热器的共轭传热和流体流动性能。槽道侧壁引入了四种不同类型的新型加强筋，包括梯形加强筋、矩形加强筋、水翼加强筋和椭圆形加强筋。通过比较摩擦系数 ( f )、努塞尔数 (NuNu)、流体体积温度 (Tf{T_{f}})、壁面剪切应力 ( τ )、场协同数 (FcFc)、不可逆热损失进行性能评估(Qd{Q_{d}}) 和雷诺数中的贝扬数 (BeBe)，范围从 Re=100\mathit{Re}=100 到 Re=1000\mathit{Re}=1000。结果表明，这些新型肋的加入有助于提高微通道散热器的整体热性能和水力性能。从 Bejan 数的结果来看，据透露，超过 96% 的损失是由于传热造成的。然而，在低雷诺数下，由于流体速度非常低，摩擦损失可以忽略不计。此外，已经表明，雷诺数越高，速度和温度梯度之间的协同关系就越弱。此外，从这项研究中可以清楚地看出，椭圆形肋在热力方面表现更好，而水翼肋在水动力方面表现更好。