In this study, 3-Dimensional numerical simulations are carried out to characterize the laminar fluid flow as well as forced convection heat transfer through novel designs of single and double layered microchannel heat sinks with cylindrical ribs. The three designs investigated in this study include: single-layered (SL) microchannels, double-layered-design 1 (DL-D1) microchannels and double-layered-design 2 (DL-D2) microchannels. Effects of different geometric parameters including rib pitch (0.5 mm ≤ P ≤ 1 mm) and radius (0.005 mm ≤ R ≤ 0.025 mm) are investigated. Based on the results, incorporation of the cylindrical ribs leads to chaotic advection and re-development of thermal boundary layers, which in turn results in a significant enhancement in heat transfer coefficient. Accordingly, reducing the rib pitch has a greater effect on improving the hydrothermal performance than increasing radius. Also, Double-layered microchannels (design 1 and 2) achieved 30–60% higher convection heat transfer coefficient in comparison with single-layered microchannels heat sinks. By increasing mass flow rate, the double-layered-design 1 microchannels led to higher thermal performances compared to single-layered and double-layered-design 2. Finally, the ribbed microchannels with the geometric characteristics of P = 0.5 and R = 0.025 are found to have the best performance.

在这项研究中，通过具有圆柱形肋的单层和双层微通道散热器的新颖设计，进行了 3 维数值模拟来表征层流流体流动以及强制对流热传递。本研究中研究的三种设计包括：单层 (SL) 微通道、双层设计 1 (DL-D1) 微通道和双层设计 2 (DL-D2) 微通道。不同几何参数的影响，包括肋节距（0.5 mm ≤  P  ≤ 1 mm）和半径（0.005 mm ≤  R） ≤ 0.025 mm) 进行调查。根据结果​​，圆柱肋的加入导致热边界层的混沌平流和重新发展，从而导致传热系数的显着提高。因此，与增加半径相比，减小肋节距对改善水热性能的影响更大。此外，与单层微通道散热器相比，双层微通道（设计 1 和 2）实现了 30-60% 的对流传热系数。通过增加质量流量，与单层和双层设计 2 相比，双层设计 1 微通道具有更高的热性能。 最后，具有P  = 0.5 和R的几何特征的肋状微通道 = 0.025 被发现具有最佳性能。