Microwave irradiation based non-chemical method to manipulate surface tension of nanofluids
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Manipulation of the surface tension is one of the key pathways to enhance heat and mass transfer performances of nanofluids in thermal systems. Current practices and existing literature on the surface tension reduction indicate that surfactant is usually employed as a chemical-additive to manipulate surface tension. This study, on the other hand, aims to explore a physical method to manipulate the surface tension of nanofluids based on microwave irradiation. This paper, therefore, is the first publication to report surface tension behaviors of nanofluids during and after microwave irradiation. Experimental results show that after microwave treatment, lower surface tensions were observed for both TiO2 and Fe2O3 based nanofluids for an extended period of time, even though the temperature has returned to its initial condition. These preliminary findings suggest that microwave irradiation treatment has the potential to be a non-chemical method to manipulate surface tension of nanofluids.
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Asada, M.; Kanazawa, Y.; Asakuma, Y.; Honda, I.; Phan, Chi (2015)© 2015 The Institution of Chemical Engineers. Surface tension of fluids is an important factor controlling multiphase systems and is often manipulated by surfactants during industrial processes. Previously, we have found ...
Parmar, Harisinh Bhikhubhai; Asada, M.; Kanazawa, Y.; Asakuma, Y.; Phan, Chi; Pareek, Vishnu; Evans, G. (2014)In this study, microwave irradiation was applied to hanging droplets of both water and ethylene glycol. Once the irradiation had ceased and the droplet was allowed to return to its original temperature, it was found that ...
Asada, M.; Kanazawa, Y.; Asakum, Y.; Honda, I.; Phan, Chi; Parmar, Harisinh Bhikhubhai; Pareek, Vishnu; Evans, G. (2014)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 ...