On the hot-spot-controlled critical heat flux mechanism in pool boiling of saturated fluids

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In this paper, we further investigate the hypothesis that the critical heat flux (CHF) occurs when some point on the heated surface reaches a high enough temperature that liquid can no longer contact that point, resulting in a gradual but continuous increase in the overall surface temperature. This hypothesis unifies the occurrence of the CHF and the quenching of hot surfaces by relating both to the same concept, i.e., the ability of a liquid to contact a hot surface. We use a two-dimensional transient conduction model to study the boiling phenomenon in the second transition region of saturated pool nucleate … continued below

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41 p.

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Unal, C.; Sadasivan, P. & Nelson, R.A. January 1, 1992.

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Description

In this paper, we further investigate the hypothesis that the critical heat flux (CHF) occurs when some point on the heated surface reaches a high enough temperature that liquid can no longer contact that point, resulting in a gradual but continuous increase in the overall surface temperature. This hypothesis unifies the occurrence of the CHF and the quenching of hot surfaces by relating both to the same concept, i.e., the ability of a liquid to contact a hot surface. We use a two-dimensional transient conduction model to study the boiling phenomenon in the second transition region of saturated pool nucleate boiling on a horizontal surface. The heater surface is assumed to consist of two regions: a dry patch region formed as a result of complete evaporation of the thinner liquid macrolayers and a two-phase macrolayer region formed by numerous vapor stems penetrating relatively thick liquid macrolayers. The constitutive relations used to determine the stem-macrolayer configuration in the two-phase macrolayer region of the boiling surface were reevaluated for Gaertner's clean water and water-nickel/salt solution. 29 refs.

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41 p.

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OSTI; NTIS; GPO Dep.

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  • Engineering Foundation conference on pool and external flow boiling, Santa Barbara, CA (United States), 22-27 Mar 1992

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  • Other: DE92011352
  • Report No.: LA-UR-92-756
  • Report No.: CONF-9203122--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5325072
  • Archival Resource Key: ark:/67531/metadc1066362

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  • January 1, 1992

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  • Feb. 4, 2018, 10:51 a.m.

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  • Dec. 14, 2020, 2:26 p.m.

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Unal, C.; Sadasivan, P. & Nelson, R.A. On the hot-spot-controlled critical heat flux mechanism in pool boiling of saturated fluids, article, January 1, 1992; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1066362/: accessed March 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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