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research-article

Effect of thermophysical properties of the heater substrate on CHF in pool boiling

[+] Author and Article Information
Pruthvik A. Raghupathi

Department of Mechanical Engineering Rochester Institute of Technology 76 Lomb Memorial Drive, Rochester, NY-14623
par3002@rit.edu

Satish G. Kandlikar

Department of Mechanical Engineering Rochester Institute of Technology 76 Lomb Memorial Drive, Rochester, NY-14623
sgkeme@rit.edu

1Corresponding author.

ASME doi:10.1115/1.4036653 History: Received September 06, 2016; Revised December 05, 2016

Abstract

While the role of the liquid properties and operating conditions on critical heat flux (CHF) in pool boiling is well investigated, the effect of the heater material properties is not well understood. Previous studies indicate that the heater thickness plays an important role on the CHF phenomenon. However, beyond a certain thickness, called the asymptotic thickness, the local temperature fluctuations on the heater surface caused by the periodic bubble ebullition cycle are evened out and the CHF is not influenced by further increases in the thickness. In the present work, data from literature and pool boiling experiments are used to determine the CHF for thick heaters with seven substrates - aluminum, brass, copper, carbon steel, Monel 400, silver, and silicon. The results indicate that the product of density (?) and specific heat (cp) represents an important substrate property group that affects the CHF, and that the thermal conductivity is not an important parameter. A well-established force-balance based CHF model (Kandlikar model) is modified to account for the thermal properties of the substrate. The predicted CHF values are within 15% of the experimental results.

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