Abidi Awatef, Ahmadi Amir, Enayati Mojtaba, Sajadi S Mohammad, Yarmand Hooman, Ahmed Arslan, Cheraghian Goshtasp
Physics Department, College of Sciences Abha, King Khalid University, Abha 61421, Saudi Arabia.
Research Laboratory of Metrology and Energy Systems, Energy Engineering Department, National Engineering School, Monastir University, Monastir 5000, Tunisia.
Micromachines (Basel). 2021 Sep 16;12(9):1113. doi: 10.3390/mi12091113.
In industrial processes, the microtechnology concept refers to the operation of small devices that integrate the elements of operational and reaction units to save energy and space. The advancement of knowledge in the field of microfluidics has resulted in fabricating devices with different applications in micro and nanoscales. Micro- and nano-devices can provide energy-efficient systems due to their high thermal performance. Fluid flow in microchannels and microstructures has been widely considered by researchers in the last two decades. In this paper, a review study on fluid flow within microstructures is performed. The present study aims to present the results obtained in previous studies on this type of system. First, different types of flows in microchannels are examined. The present article will then review previous articles and present a general summary in each section. Then, the multi-phase flows inside the microchannels are discussed, and the flows inside the micropumps, microturbines, and micromixers are evaluated. According to the literature review, it is found that the use of microstructures enhances energy efficiency. The results of previous investigations revealed that the use of nanofluids as a working fluid in microstructures improves energy efficiency. Previous studies have demonstrated special attention to the design aspects of microchannels and micro-devices compared to other design strategies to improve their performance. Finally, general concluding remarks are presented, and the existing challenges in the use of these devices and suggestions for future investigations are presented.
在工业过程中，微技术概念指的是小型设备的运行，这些设备集成了操作单元和反应单元的元件以节省能源和空间。微流体领域知识的进步使得能够制造出在微米和纳米尺度具有不同应用的设备。微米和纳米设备因其高热性能可提供节能系统。在过去二十年里，研究人员广泛研究了微通道和微结构中的流体流动。本文对微结构内的流体流动进行了综述研究。本研究旨在展示此前关于此类系统的研究所取得的成果。首先，考察了微通道中不同类型的流动。本文随后将回顾此前的文章并在每个部分给出总体总结。然后，讨论微通道内的多相流，并评估微型泵、微型涡轮机和微混合器内的流动。根据文献综述发现，微结构的使用提高了能源效率。此前的研究结果表明，在微结构中使用纳米流体作为工作流体可提高能源效率。与其他设计策略相比，此前的研究特别关注微通道和微设备的设计方面以提高其性能。最后，给出了总体结论，并阐述了使用这些设备时存在的挑战以及对未来研究的建议。
