Vatsa Aditya, Alam Tabish, Siddiqui Md Irfanul Haque, Ali Masood Ashraf, Dobrotă Dan
Department of Mechanical Engineering, Thapar Institute of Engineering and Technology, Patiala 147004, India.
CSIR-Central Building Research Institute, Roorkee 247667, India.
Materials (Basel). 2022 Jul 6;15(14):4740. doi: 10.3390/ma15144740.
New designs of the microchannel with a two-sided wedge shape at the base were studied numerically. Five different wedge angles ranging from 3° to 15° were incorporated into the microchannel design. Simulation of this novel microchannel was carried out using Computational Fluid Dynamics (CFD). Three-dimensional models of the microchannel heat sink were created, discretized, and based on Navier-Stokes and energy equations; laminar numerical solutions were obtained for heat transfer and pressure drop. Flow characteristics of water as coolant in a microchannel were studied. It was observed that numerical results are in good agreement with experimental results. It was found that the Nusselt number and friction factor are significantly varied with the increase in Reynolds number. The Nusselt number varies in the following ranges of 5.963-8.521, 5.986-8.550, 6.009-8.568, 6.040-8.609, and 6.078-8.644 at 3°, 6°, 9°, 12°, and 15°, respectively. The microchannel with a wedge angle of 15° was found to be better in terms of Nusselt number and thermo-hydraulic performance. The enhancement in the Nusselt number is found as 1.017-1.036 for a wedge angle of 15°; however, friction factors do not show the perceptible values at distinct values of wedge angle. Moreover, the thermo-hydraulic performance parameters (THPP) were evaluated and found to be maximum in the range of 1.027-1.045 for a wedge angle of 15°. However, minimum THPP was found in the range of 1.005-1.0185 for a wedge angle of 3°.
对底部呈双侧楔形的微通道新设计进行了数值研究。微通道设计中纳入了五个不同的楔形角，范围从3°到15°。使用计算流体动力学（CFD）对这种新型微通道进行了模拟。创建了微通道散热器的三维模型，进行了离散化，并基于纳维-斯托克斯方程和能量方程；获得了传热和压降的层流数值解。研究了微通道中作为冷却剂的水的流动特性。观察到数值结果与实验结果吻合良好。发现努塞尔数和摩擦系数随雷诺数的增加而显著变化。在3°、6°、9°、12°和15°时，努塞尔数分别在5.963 - 8.521、5.986 - 8.550、6.009 - 8.568、6.040 - 8.609和6.078 - 8.644范围内变化。发现楔形角为15°的微通道在努塞尔数和热工水力性能方面更好。对于15°的楔形角，努塞尔数的增强为1.017 - 1.036；然而，摩擦系数在不同的楔形角值下没有显示出明显的变化。此外，对热工水力性能参数（THPP）进行了评估，发现对于15°的楔形角，其在1.027 - 1.045范围内最大。然而，对于3°的楔形角，最小的THPP在1.005 - 1.0185范围内。
