A novel X-structured Double layered Microchannel Heat Sink (X-DMHS) is proposed for performance augmentation on the traditional rectangular Double layered Microchannel Heat Sink (DMHS). The overall flow and thermal performances of parallel-flow and counter-flow arrangements on X-DMHSs are studied, and the entropy generation from the second law perspective is also quantitatively analyzed. From the analysis of the pressure drop penalty, thermal performance and entropy generation rate, it is found that the proposed X-DMHSs show much superior performance either from the heat transfer performance or from the second law perspective. The design offers higher entropy generation number and better thermal uniformity on substrate, meaning that proposed X-DMHSs can control the thermal gradients more significantly and lower the highest temperature on the heated substrate more effectively with affordable rise of pumping power as compared with the corresponding traditional DMHS.

提出了一种新颖的X结构双层微通道散热器（X-DMHS），以增强传统矩形双层微通道散热器（DMHS）的性能。研究了X-DMHS上平行流和逆流装置的整体流动和热性能，并从第二定律的角度对熵的产生进行了定量分析。通过对压降损失，热性能和熵产生率的分析，发现所提出的X-DMHS从传热性能或第二定律的角度来看都表现出优异的性能。该设计可提供更高的熵产生数和更好的基板热均匀性，