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Technical Brief

Experimental verification of a prediction model for pool boiling enhanced by electrohydrodynamic effect and surface wettability

[+] Author and Article Information
Ichiro Kano

Mem. ASME Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, 992-8510, Japan
kano@yz.yamagata-u.ac.jp

Naoki Okamoto

Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, 992-8510, Japan
tah58620@st.yamagata-u.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4036040 History: Received October 17, 2015; Revised December 28, 2016

Abstract

Our previous studies on the critical heat flux (CHF) of pool boiling have shown that CHF greatly increases with the application of an electric field and that the wall temperature can be decreased to a level with the safe operation of the electrical devices by using a low contact angle with the boiling surface. To verify the earlier prediction model, we investigated CHF enhancement by changing the contact angle with the boiling surface and by the application of an electric field. A fluorinated dielectric liquid was selected as the working fluid. To allow the contact angle between the boiling surface and the dielectric liquid to be changed, the different materials (Cu, Cr, NiB, Sn) and an mixture of 5 and 1.5 micro meter diamond particles were used as a boiling surface. The CHFs at different contact angles were 95 %~125 % of that for a polished Cu surface. Upon application of a -5 kV/mm electric field to the diamond particle surface, CHF of 99 W/cm2 at a superheat of 33.5 K was obtained. Based on this experimental evidence, we normalized the CHF and contact angle using our previously developed hydrodynamic instability model and semi-empirical model. This procedure allows us to develop a general model that predicted CHF well, including the CHF for the DI water.

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