Numerical analysis on droplet mixing induced by microwave heating: Decoupling of influencing physical properties

被引：2
作者：
Cui W. [1 ]
Yesiloz G. [1 ]
Ren C.L. [1 ]
机构：
[1] Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave West, Waterloo, N2L 3G1, Ontario
来源：
Chemical Engineering Science | 2020年 / 224卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Droplet microfluidics; Interfacial tension; Marangoni flow; Microwave heating; Rapid mixing;
D O I：
10.1016/j.ces.2020.115791
中图分类号：
学科分类号：
摘要：
Microwave resonator offers simultaneous sensing and heating of individual droplets in microchannels presenting unique advantages for applications requiring well-controlled reaction time. This study numerically investigates the effects of the temperature-dependent fluid properties including viscosity, density, diffusivity, and interfacial tension, on microwave heating induced mixing. A system consisting of a spiral resonator integrated with a microchannel with aqueous droplets moving with a carrier oil is considered. The electromagnetic field which provides heating to the droplets, and the flow and tracer concentration fields inside the droplet are obtained using commercial software, Ansys HFSS and Fluent, respectively. It is found that the mixing index can be increased from 0.4 to 0.84 within 320[ms] with microwave heating and it would be slightly increased to 0.47 when only the interfacial tension was made independent on temperature, which suggests that the temperature-dependent interfacial tension is the dominant factor for microwave heating induced mixing. © 2020 Elsevier Ltd
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