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Heat Transfer and Pressure Drop in an Artificially Roughened Tube at Various Prandtl Numbers


Hastrup, Rolf Constantin (1958) Heat Transfer and Pressure Drop in an Artificially Roughened Tube at Various Prandtl Numbers. Engineer's thesis, California Institute of Technology. doi:10.7907/SG10-T622.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. 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 (Engineer's thesis)
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:1 January 1958
Record Number:CaltechETD:etd-10082004-112907
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3984
Deposited By: Imported from ETD-db
Deposited On:12 Oct 2004
Last Modified:16 Oct 2023 21:31

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PDF (Hastrup_rc_1958.pdf) - Final Version
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