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An investigation of the mechanism of heat transfer near the critical state of a fluid


Griffith, Jerry D. (1960) An investigation of the mechanism of heat transfer near the critical state of a fluid. Engineer's thesis, California Institute of Technology.


Very large heat transfer coefficients have been observed in the one phase region near the critical point of some fluids. There has been some conjecture that the increase in these coefficients might be due to the agitation caused by bubble-like aggregates of low density fluid. It was believed that these bubble-like formations might grow and collapse in much the same way as actual bubbles in nucleate boiling. The purpose of these experiments was to see if the suggested mechanism of heat transfer could be observed and if it could be related to a significant increase in the heat transfer rate. Freon 114A was chosen as the test fluid because of its relatively low critical temperature and pressure. With this fluid and with the range of variables tested, bubble-like formations were observed under some conditions. However, no definite correlation to an increase in the heat transfer rate was noted. This fact should not exclude the possibility that bubble-like activity might result in a sharp increase in heat transfer rates in other fluids or even under different operating conditions with the fluid in question.

Item Type:Thesis (Engineer's thesis)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Sabersky, Rolf H.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1960
Record Number:CaltechETD:etd-02172006-131143
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:664
Deposited By: Imported from ETD-db
Deposited On:21 Feb 2006
Last Modified:26 Dec 2012 02:31

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PDF (Griffith_jd_1960.pdf) - Final Version
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