With high-tech industrial development, micro/mini-channel heat sinks (MCHSs) are very widely applied for heat dissipation in high-heat-flux devices in these industries. At present, the energy crisis and environmental problems have been restricting human development. Therefore, MCHSs with low energy consumption are urgently designed. In this investigation, a new MCHS with a combined structure of longitudinal and transverse vortex generators is designed and the AlO nanofluid is used as a working medium to further improve various performances of this MCHS. The effects of the transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic characteristic, thermal characteristic, comprehensive performance, entropy generation and exergy efficiency are explored. It is found that the triangular transverse vortex generator is conductive to improve the comprehensive performance and exergy efficiency. Whose performance evaluation criterion is 22.34% on average higher than that of the smooth mini-channel, and the average exergy efficiency reaches 94.30%. On the basis of this, combining the longitudinal and transverse vortex generators can further improve the various performances in mini-channel. The optimal combined structure is the combination of triangular transverse vortex generator and 90°-longitudinal vortex generator and can make mini-channel yield the best comprehensive performance, entropy generation and exergy efficiency. Which obtains the highest performance evaluation criterion (1.36) and exergy efficiency (97.63%) when Reynolds number is 742. Overall, the new MCHS performs a beneficial effect on comprehensive performance improvement in mini-channel to enhance energy efficiency.

中文翻译：

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使用 Al2O3 纳米流体结合纵向和横向涡流发生器进行微通道中的水热、熵产生和火用性能分析


随着高科技产业的发展，微通道散热器（MCHS）在这些行业的高热通量设备的散热中得到了非常广泛的应用。当前，能源危机和环境问题一直制约着人类的发展。因此，迫切需要设计低能耗的MCHS。本研究设计了一种具有纵向和横向涡流发生器组合结构的新型MCHS，并采用Al2O纳米流体作为工作介质，进一步提高了该MCHS的各种性能。探讨了横向涡发生器形状和纵向涡发生器角度对水力特性、热力特性、综合性能、熵产和火用效率的影响。研究发现，三角横向涡发生器有利于提高综合性能和火用效率。其性能评价标准比畅通小通道平均提高22.34%，平均火用效率达到94.30%。在此基础上，将纵向和横向涡发生器相结合，可以进一步提高微通道的各项性能。最佳组合结构为三角形横向涡流发生器和90°纵向涡流发生器的组合，可以使微通道产生最佳的综合性能、熵产率和火用效率。当雷诺数为742时，获得了最高的性能评价标准（1.36）和火用效率（97.63%）。总体而言，新的MCHS对小通道综合性能改进、提高能源效率起到了有益的作用。