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Density Transients in Boiling Liquid Systems. Report 52-17.

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Description

A program was undertaken to study the density response of a liquid-vapor system when subjected to a change in the magnitude of a distributed heat source. The density transients would be caused by the initiation, growth, and collapse of the vapor bubbles and by their travel into or out of the specified volume. The program is both analytical and experimental and the end objectives are as follows: (1) to obtain a record of the density transient associated with a change in distributed volume heating in a defined region of the fluid; (2) to investigate factors involved in controlling the time … continued below

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131 pages : illustrations

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Martin, William L.; Mead, Bruce R.; Greenfield, M. L.; Lipkis, Robert; Romie, Fred E.; Wong, Ging et al. July 1952.

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Description

A program was undertaken to study the density response of a liquid-vapor system when subjected to a change in the magnitude of a distributed heat source. The density transients would be caused by the initiation, growth, and collapse of the vapor bubbles and by their travel into or out of the specified volume. The program is both analytical and experimental and the end objectives are as follows: (1) to obtain a record of the density transient associated with a change in distributed volume heating in a defined region of the fluid; (2) to investigate factors involved in controlling the time lag association with a given density change; (3) to derive and establish limits of validity for an analytical expression described density as a function of time. A description of the apparatus to create and record density transients at pressures from atmospheric to 1000 psia is given and preliminary experimental results are presented. Time lags, from the initiation of a heating pulse to the start of a density transient, of the order of 0.25 second were most commonly observed in solutions of potassium hydroxide at atmospheric pressure. In an attempt to correlate liquid superheat with system-density response, a static superheat apparatus and procedure were developed and a variety of superheat data have been obtained. The analytical phase of the program is directed toward deriving equations to describe bubble initial growth. Equations from Döring's theory are applied to water at elevated pressures and the resultant calculated superheats are compared with the experimental measurements. In order to eliminate some of the approximations in the analytical work, a molecular approach is being used to evaluate the effects of surface tension on liquid superheat.

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131 pages : illustrations

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Digitized from microopaque cards (4).

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  • Report No.: AECU-2169
  • Grant Number: AT(11)-177
  • SuDoc Number: Y 3.At 7:22/AECU-2169
  • Accession or Local Control No: metadc1240597
  • Archival Resource Key: ark:/67531/metadc1240597

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  • July 1952

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  • Nov. 5, 2023, 7:58 a.m.

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  • Oct. 25, 2024, 10:12 a.m.

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Martin, William L.; Mead, Bruce R.; Greenfield, M. L.; Lipkis, Robert; Romie, Fred E.; Wong, Ging et al. Density Transients in Boiling Liquid Systems. Report 52-17., report, July 1952; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1240597/: accessed December 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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