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Evaporative Characteristics of Al2O3 Nanofluid Droplet on Heated Surface

[+] Author and Article Information
Dae Yun Kim

School of Mechanical Engineering, Chung-Ang University, Seoul 156-756, Korea
k1x83@naver.com

Jae Bin Lee

School of Mechanical Engineering, Chung-Ang University, Seoul 156-756, Korea
jaebin00@nate.com

Seong Hyuk Lee

School of Mechanical Engineering, Chung-Ang University, Seoul 156-756, Korea
shlee89@cau.ac.kr

Jung-Yeul Jung

Technology Center of Offshore Plant Industries, Korea Research Institute of Ships and Ocean Engineering, KIOST, Daejeon 305-343, Korea
jungjy73@gmail.com

1Corresponding author.

J. Heat Transfer 138(8), 080907 (Jul 08, 2016) (1 page) Paper No: HT-16-1213; doi: 10.1115/1.4033823 History: Received April 17, 2016; Revised June 03, 2016

Abstract

The present study experimentally investigates the evaporative characteristics for a nanofluid droplet on heated surface. For experiments, the alumina (Al2O3) nanoparticles having a 50 nm average diameter were distributed in deionized (DI) water. The equilibrium contact angles (ECA) of DI-water on bare (without texturing) and hole-patterned textured (by µ- CNC machine) copper surfaces were 60o and 82o. Also, advancing and receding contact angles were 73.3o and 25.8o for bare surface, and 101.3o and 55.2o for textured surface. Surface temperature was fixed as 100±0.2oC, measured by resistance temperature detector (RTD) sensors with data logger. During the experiments, the ambient temperature was 22oC with the relative humidity of 32%. At the initial stage, the dynamic contact angle (DCA) of 0.01 vol.% nanofluid droplet on the textured surface drastically increased over its own ECA due to the generation of large bubbles inside the droplet. However, the contact angle of 0.1vol.% nanofluid droplet at t = 5 s was smaller than that of 0.01vol.% case because the increase in nanofluid concentration caused the reduction of surface tension. After that, DCA gradually decreased until dried out, and total evaporation time was significantly delayed in the case of textured surface. Moreover, the heat transfer characteristics during evaporation phenomenon was affected by the nanofluid concentration and the contact area with the heated surface.

Copyright © 2016 by ASME
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