A correlation for nucleate flow boiling in small channels

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Compact heat exchangers are becoming more attractive for applications in which energy conservation, space saving, and cost are important considerations. Applications exist in the process industries where phase-change heat transfer realizes more compact designs and improved performance compared to single-phase heat transfer. However, there have been only a few studies in the literature reporting on phase-change heat transfer and two-phase flow in compact heat exchangers, and validated design correlations are lacking. Recent data from experiments on flow boiling of refrigerants in small channels have led researchers to conclude that nucleation is the dominant heat transfer mechanism over a broad range ... continued below

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30 p.

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Tran, T.N.; Wambsganss, M.W.; Chyu, M.C. & France, D.M. August 1, 1997.

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  • Tran, T.N. Texas Tech Univ., Lubbock, TX (United States). Dept. of Mechanical Engineering
  • Wambsganss, M.W. Argonne National Lab., IL (United States)
  • Chyu, M.C. Texas Tech Univ., Lubbock, TX (United States). Dept. of Mechanical Engineering
  • France, D.M. Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical Engineering

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Description

Compact heat exchangers are becoming more attractive for applications in which energy conservation, space saving, and cost are important considerations. Applications exist in the process industries where phase-change heat transfer realizes more compact designs and improved performance compared to single-phase heat transfer. However, there have been only a few studies in the literature reporting on phase-change heat transfer and two-phase flow in compact heat exchangers, and validated design correlations are lacking. Recent data from experiments on flow boiling of refrigerants in small channels have led researchers to conclude that nucleation is the dominant heat transfer mechanism over a broad range of heat flux and wall superheats. Local heat transfer coefficients and overall two-phase pressure drops were measured for three different refrigerants with circular and non-circular channels in a range of pressures. This data base supports the nucleate boiling mechanism, and it was used to develop a new correlation for heat transfer in nucleate flow boiling. The correlation is based on the Rohsenow boiling model, introducing a confinement number defined by Kew and Cornwell. The new correlation predicts the experimental data for nucleate flow boiling of three refrigerants within {+-}15%.

Physical Description

30 p.

Notes

OSTI as DE97007093

Source

  • Compact heat exchangers for the process industries conference, Snowbird, UT (United States), 22-27 Jun 1997

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  • Other: DE97007093
  • Report No.: ANL/ET/CP--92074
  • Report No.: CONF-9706130--1
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 508127
  • Archival Resource Key: ark:/67531/metadc695152

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • August 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

Description Last Updated

  • Dec. 16, 2015, 12:13 p.m.

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Tran, T.N.; Wambsganss, M.W.; Chyu, M.C. & France, D.M. A correlation for nucleate flow boiling in small channels, article, August 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc695152/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.