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TECHNICAL BRIEFS

A Model of Bubble Nucleation on a Micro Line Heater

[+] Author and Article Information
S.-D. Oh

Hyosung Corporation, Seoul 121-020, Korea

S. S. Seung

Samchok National University, Samchok City 245-080, Korea

H. Y. Kwak

Department of Mechanical Engineering, Chung-Ang University, 221 Huksuk- Dong, Dongjak-ku, Seoul 156-756, Korea

J. Heat Transfer 121(1), 220-225 (Feb 01, 1999) (6 pages) doi:10.1115/1.2825950 History: Received January 27, 1998; Revised July 20, 1998; Online December 05, 2007

Abstract

The bubble nucleation mechanism on a cavity-free micro line heater surface was studied by using the molecular cluster model. A finite difference numerical scheme for the three-dimensional transient conduction equation for the liquid was employed to estimate the superheated volume where homogeneous bubble nucleation could occur due to heat diffusion from the heater to the liquid. Calculation results revealed that bubble formation on the heater is possible when the temperature at the hottest point in the heater is greater than the superheat limit of the liquid by 6°C–12°C, which is in agreement with the experimental results. Also it was found that the classical bubble nucleation theory breaks down near the critical point where the radius of the critical bubble is below 100 nm.

Copyright © 1999 by The American Society of Mechanical Engineers
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