关于液体流经非圆形微孔隙的实验。

Experiments on Liquid Flow through Non-Circular Micro-Orifices.

作者信息

Cassineri Stefano, Cioncolini Andrea, Smith Liam, Curioni Michele, Scenini Fabio

机构信息

Materials Performance Centre, Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, UK.

Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, George Begg Building, Sackville Street, Manchester M1 3BB, UK.

出版信息

Micromachines (Basel). 2020 May 19;11(5):510. doi: 10.3390/mi11050510.

DOI:10.3390/mi11050510

PMID:32438546

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7281200/

Abstract

Microfluidics is an active research area in modern fluid mechanics, with several applications in science and engineering. Despite their importance in microfluidic systems, micro-orifices with non-circular cross-sections have not been extensively investigated. In this study, micro-orifice discharge with single-phase liquid flow was experimentally investigated for seven square and rectangular cross-section micro-orifices with a hydraulic diameter in the range of 326-510 µm. The discharge measurements were carried out in pressurized water (12 MPa) at ambient temperature (298 K) and high temperature (503 K). During the tests, the Reynolds number varied between 5883 and 212,030, significantly extending the range in which data are currently available in the literature on non-circular micro-orifices. The results indicate that the cross-sectional shape of the micro-orifice has little, if any, effect on the hydrodynamic behavior. Thus, existing methods for the prediction of turbulent flow behavior in circular micro-orifices can be used to predict the flow behavior in non-circular micro-orifices, provided that the flow geometry of the non-circular micro-orifice is described using a hydraulic diameter.

摘要

微流体技术是现代流体力学中一个活跃的研究领域，在科学和工程领域有多种应用。尽管非圆形横截面的微孔在微流体系统中很重要，但尚未得到广泛研究。在本研究中，对七个水力直径在326 - 510 µm范围内的方形和矩形横截面微孔进行了单相液体流动的微孔排放实验研究。排放测量是在环境温度（298 K）和高温（503 K）下的加压水（12 MPa）中进行的。在测试过程中，雷诺数在5883至212,030之间变化，显著扩展了目前文献中关于非圆形微孔可用数据的范围。结果表明，微孔的横截面形状对流体动力学行为影响很小（如果有影响的话）。因此，现有的预测圆形微孔中湍流流动行为的方法可用于预测非圆形微孔中的流动行为，前提是使用水力直径来描述非圆形微孔的流动几何形状。