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
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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)|
|Defense Date:||1 January 1958|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||12 Oct 2004|
|Last Modified:||26 Dec 2012 03:04|
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