This paper presents a new fin pattern for air-cooled branched-wavy minichannel heat sink (BWMCHS) where three different secondary passes at a distance of 0.5λ, 1.0λ and 1.5λ have been considered (λ is the wavelength and equals to 20 mm). A comprehensive computational and experimental analysis is implemented to investigate the thermo-fluidic characteristics in detail. The RNG k-ε model with enhanced wall treatment with pressure and thermal effect has been used in the numerical analysis. Numerical investigations were validated with experiments. The numerical result is further examined to understand the phenomenological understanding of the air flow through these geometries. In the spanwise direction, BWMCHSs was observed to induce significant non-uniform distribution of air mass flow rate at the inlet and outlet. The pressure drop penalty exceeded the heat transfer enhancement due to flow migration. BWMCHS 0.5λ reported a higher pressure penalty among all the MCHSs. The BWMCHSs showed enhanced thermal performance over a straight minichannel heat sink (SMCHS). In conclusion, the overall performance of BWMCHS at 1.0λ secondary pass has been found superior over BWMCHS 0.5λ and BWMCHS 1.5λ in both numerical and experimental investigations.

本文提出了一种用于风冷分支波浪形微通道散热器（BWMCHS）的新翅片图案，其中考虑了三个不同的二次通过距离分别为0.5λ，1.0λ和1.5λ（λ是波长，等于20 mm ）。进行了全面的计算和实验分析以详细研究热流体特性。在数值分析中使用了带有压力和热效应的强化墙处理的RNGk-ε模型。数值研究已通过实验验证。进一步检查了数值结果，以了解通过这些几何形状的气流的现象学理解。在翼展方向上，观察到BWMCHSs在进气口和出口引起明显的空气质量流量不均匀分布。由于流动迁移，压降损失超过了热传递增强。BWMCHS0.5λ报告了所有MCHS中较高的压力损失。BWMCHS显示出比直的微型通道散热器（SMCHS）更高的热性能。总之，在数值和实验研究中，发现BWMCHS在1.0λ二次通过时的整体性能均优于BWMCHS0.5λ和BWMCHS1.5λ。