The Effect of Surface Vibration on Nucleate Pool Boiling at Low Heat Fluxes PDF Download
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Author: Donald Craig Price
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Author: Donald Craig Price
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Author: Abbas M. Sinnarwalla
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 100
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"The purpose of this investigation was to determine the effect of surface conditions on the heat transfer for nucleate pool boiling from flat horizontal surfaces. Experiments were carried out using Refrigerant-1l at atmospheric pressure as the test fluid with Inconel-600 as the heater material. The heat transfer coefficient was determined for mirror finished, chemically etched, glass beaded and sandpaper roughened heater surfaces over heat flux ranging for 0 to 18000 BTU/HR SQ FT. At a given heat flux, the heat transfer coefficient was found to be the lowest for mirror finished surface and the highest for sandpaper roughened surface"--Abstract, leaf ii.
Author: John Charles Macpherson
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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An experimental investigation was performed to determine the effects of vibrations on nucleate boiling heat transfer rates. Transverse harmonic vibrations up to 2000 cps were applied to a one-half inch wide Nichrome 5 heater mounted on a 1.25 x 9.0 inch phenolic cylinder. Large improvements in h were obtained at low q/A. However, as the heat flux was increased to approximately 150,000 B/hr sq ft, the improvement diminished to zero, or, in some instances, even a slight degradation. The maximum attainable h for heat fluxes below 150,000 B/hr sq ft occurred at 40 cps. It was nearly equal to the maximum attainable h due to forced convection as reported by McAdams. (Author).
Author: Bruce David Marcus
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 444
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Author: David Virgil Porchey
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 284
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"This study constituted an examination of both nucleate boiling and maximum heat flux characteristics of liquid nitrogen boiling from characterized surfaces. Several textures of gold plated copper surfaces were studied in addition to silver and silver oxide surfaces. Data were taken over a wide range of reduced pressures. All surfaces were examined using a Scanning Electron Microscope (SEM). Data and micrograph comparison revealed that both surface chemistry and surface roughness affect the nucleate boiling characteristics of liquid nitrogen. These effects are separated from each other showing that nucleate boiling is a function of both surface chemistry and topography. Surface roughness was found to have a significant effect on the maximum heat flux with rougher surfaces yielding higher heat flux values. The temperature difference at burnout was found to be a function of both surface chemistry and roughness. Some existing correlations for both nucleate boiling and maximum heat fluxes were examined and shown to inadequately predict the data, primarily because of inability to account for surface roughness and/or surface-fluid interaction as affected by surface chemistry. A maximum temperature difference correlation tested predicted burnout temperature differences well. The necessity to age a surface in the fluid to be boiled was found not to be a result of adsorbed gases, but probably a result of impurities acquired on the surface that must be removed. Attempts to observe hysteresis is were unsuccessful. Hysteresis was found not to be a function of adsorbed inert gases. Data indicated that one mechanism of heat transfer by nucleate boiling will not suffice for all pressures. An existing nucleate boiling correlation was modified to allow for a mechanism change and predicted the data better than other correlations tested"--Abstract, pages ii-iii.
Author: Michael Damon Maynard
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Book Description
A system was designed to investigate experimentally the mechanism of nucleate pool boiling heat transfer using commercial grade liquid nitrogen as a working fluid. A circular horizontal flat plate five square centimeters in area was utilized as a boiler surface. The effect of various surface parameters on the characteristic heat flux versus (Tw-Ts) curve at atmospheric conditions was determined. Surfaces used included a highly polished mirror surface, a mirror surface coated with oxide, a mirror surface coated with grease, a roughened surface, and a roughened surface coated with Teflon, all fabricated from commercial electrical tough pitch copper. The final surface used was a Nickel 200 highly polished mirror surface. The data from the copper surface with a mirror finish was in agreement with the data of previous investigations. The effects of roughness, contaminants, hysteresis, and boiler surface material were discussed. A comparison was made on incipient boiling heat fluxes. The results indicate that the surface conditions play a major role in nucleate pool boiling heat transfer to liquid nitrogen.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Paul J. Marto
Publisher:
ISBN:
Category : Boiling-points
Languages : en
Pages : 127
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Author: P. J. Marto
Publisher:
ISBN:
Category : Boiling water reactors
Languages : en
Pages : 127
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Author: L. H. Chai
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 24
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