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An Experimental Investigation of Free Convection Heat Transfer to Carbon Dioxide in the Region of its Critical Point


Knapp, Karl Kent (1965) An Experimental Investigation of Free Convection Heat Transfer to Carbon Dioxide in the Region of its Critical Point. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/A4PD-0R66.


Experimental results are presented for an investigation of free convection heat transfer to carbon dioxide in the region of its critical point. Shadowgraph images of the flow patterns accompanying the heat transfer have been recorded photographically. A horizontal 0.010-inch-diameter cylindrical Nichrome wire was used as the test section for the primary investigation. Tests were conducted in carbon dioxide with pressures from 1000 psia to 1500 psia and bulk temperatures from 49.0° to 137.0°F. "Bubble-like" and oscillating flow conditions were observed in the experiments conducted with the cylindrical test section. The occurrence of "bubble-like" flow conditions, along with pronounced changes in the fluid properties, resulted in significant improvements in the heat transfer process, as compared to heat transfer resulting with laminar flow at lower heat fluxes. Additional experiments with a vertical wire and a horizontal strip indicated that the occurrence of the "bubble-like" flow depends on the shape and orientation of the heat transfer surface. The results of heat transfer with the "bubble-like" flow condition in supercritical carbon dioxide are compared with heat transfer results with" boiling at subcritical pressures.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Mechanical Engineering)
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:11 September 1964
Record Number:CaltechTHESIS:08262011-100648981
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6623
Deposited By: Tony Diaz
Deposited On:26 Aug 2011 18:04
Last Modified:20 Feb 2024 23:44

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