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In-situ observation of convection in droplet under microwave radiation by PIV

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Authors
Asada, M.
Kanazawa, Y.
Asakum, Y.
Honda, I.
Phan, Chi
Parmar, Harisinh Bhikhubhai
Pareek, Vishnu
Evans, G.
Date
2014
Type
Conference Paper

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Asada, M. and Kanazawa, Y. and Asakum, Y. and Honda, I. and Phan, C. and Parmar, H.B. and Pareek, V. et al. 2014. In-situ observation of convection in droplet under microwave radiation by PIV, in International Conference on Optical Particle Characterization, OPC 2014, Mar 10 2014. Tokyo; Japan: International Society for Optical Engineering (SPIE).
Source Title
Proceedings of SPIE - The International Society for Optical Engineering
Source Conference
International Conference on Optical Particle Characterization, OPC 2014
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Department of Chemical Engineering
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Abstract

In this study, microwave irradiation is applied to a liquid droplet and the surface tension, the circulation flow and temperature of water droplet are measured dynamically under the irradiation. The droplet was allowed to return to its original temperature after the irradiation, it was found that water surface tension remained well below its original value for an extended period of time. Surface tension reduction shown similar effect of "impurity" at molecular level during the microwave, and some "memory" after microwave, which might be caused by nano-bubble. On the other hand, microwave can introduce the circulation flow of higher rotation speed and will be expected to be applied for non-contact stirring method.