Micro-PIV experimental measurements of vortex evolution inside generated droplets in T-inlet microchannel

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-01-23 DOI:10.1016/j.expthermflusci.2025.111418

Wang Cao , Qingjun Yang , Ruikai Guo , Qi Mao

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Abstract

The evolution of swirling intensity within droplets during the formation of squeezing microdroplets in T-inlet microchannel devices was experimentally investigated utilizing the microparticle image velocimetry (micro-PIV) technique. Swirling intensity is quantitatively characterized by defining the average rotational angular velocity of fluid units under shear-free conditions. The effects of the continuous phase capillary number and the dispersed phase flow velocity on the evolution of swirling intensity within the droplets were investigated experimentally. Experimental results indicate that the internal vortex evolution process of droplets during the formation of squeezing microdroplets can be categorized into four distinct phases. An increase in the capillary number of the continuous phase effectively shortens the microdroplet formation period while enhancing the recirculation swirling intensity within the droplets. Conversely, by adjusting the flow velocity of the dispersed phase fluid, variations in the droplet formation period can be achieved without altering the swirling intensity. These findings provide a theoretical foundation for improving mixing, mass and heat transfer processes within microdroplets.

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.