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Heat transfer and pressure drop in an artificially roughened tube at various Prandtl numbers

Citation

Hastrup, Rolf C. (1958) Heat transfer and pressure drop in an artificially roughened tube at various Prandtl numbers. Master's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-10082004-112907

Abstract

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An experimental investigation was carried out to provide additional data for the study of heat transfer and its relation to friction in rough tubes. Tests were conducted on a tube of given roughness with the results expressed in terms of the heat transfer coefficient ([...]) and the friction coefficient ([...]). In order to demonstrate the effect of Prandtl Number ([sigma]), results were obtained over a range (6 <[sigma]< 1). This range was obtained by varying the temperature of the test fluid, distilled water, from 70-300[degrees]F in a pressurized system. The tests were carried out under forced convection using an artifically roughened, 3/8 inch diameter tube which was heated electrically by passing a high alternating current axially through its thin wall. Initial tests conducted with a smooth tube checked very well with known data and theory, with only small discrepancies at low Prandtl Number. Results for the rough tube confirm that both [...]and [...] increase with roughness. For the type roughness used, however, [...] increased only 35-50% while [...] increased 60-65% (lower percentage values appearing near [sigma] = 1) indicating that the ratio [...] decreases for increasing roughness.

Item Type:Thesis (Master'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 1958
Record Number:CaltechETD:etd-10082004-112907
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-10082004-112907
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3984
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:12 Oct 2004
Last Modified:26 Dec 2012 03:04

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