What is it about?
Experimental flow visualization is a valuable tool for analyzing microfluidics and nanofluidics in various applications. Since the late 1990s, considerable advances in optical methods and image postprocessing techniques have improved direct optical measurements, resulting in an accurate qualitative and quantitative understanding of transport phenomena in lab-on-a-chip capillaries. In this study, a comparison of different optical measurement techniques is presented. The state-of-the-art development of particle image velocimetry (PIV) to date, particularly in microscale applications, is reviewed here in detail.
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Why is it important?
Our study reviews novel approaches to estimating high-precision velocity field measurements within interrogation windows. Different regularization terms are discussed to demonstrate their capability for particle displacement optimization. The discussion shows how single- and multi-camera optical techniques provide two-dimensional and three-component velocity fields. The performance of each method is compared by highlighting its advantages and limitations. Finally, the feasibility of micro-resolution PIV in bioapplications is overviewed.
Perspectives
I got the initial idea of writing this article when I intended to work on microchannel flow measurement using micro-PIV. It was a great pleasure as it has co-authors with whom I have had long-standing collaborations, particularly Professor Baafour Nyantekyi-Kwakye, a PIV expert. This article leads to one-stop reading material for those who are going to study/work in the micro-PIV field. I hope you find this article thought-provoking.
Dr Amin Etminan
Memorial University of Newfoundland
Read the Original
This page is a summary of: Flow visualization: state-of-the-art development of micro-particle image velocimetry, Measurement Science and Technology, June 2022, Institute of Physics Publishing,
DOI: 10.1088/1361-6501/ac75b0.
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