Heat transfer in flow boiling over a bundle of horizontal tubes

B. M. Burnside, N. F. Shire

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The paper describes tests boiling R113 at atmospheric pressure in upward flow over a 17 row column of square pitched electrically heated tubes. Uniform heat fluxes of 10-65 kW m-2 and maximum Reynolds numbers, Remax, between 7800 and 27 000 were used. The data at the lower heat fluxes of 10 and 20 kW m-2 consistently exhibited a linear increase of heat transfer coefficient, h, with quality, the slope lower at 20 kW m-2, so that h at 10 kW m-2 exceeded that at 20 kW m-2 and both reached h at 40 kW m-2 for the maximum quality tested. At the higher heat fluxes a nucleate boiling controlled region was observed at low quality, with h equal to the value at the same heat flux as observed with an isolated tube in a pool, followed by a rise in h at higher quality. The results were compared with the work of other researchers. Heat transfer coefficients for q = 40 kW m-2 were predicted to an average r.m.s. deviation of 7%, using the asymptotic flow boiling model. However, the sensitivity of h to change of quality and flowrate predicted was much lower than measured and in some cases exhibited opposite trends. © 2005 Institution of Chemical Engineers.

Original languageEnglish
Pages (from-to)527-538
Number of pages12
JournalChemical Engineering Research and Design
Volume83
Issue number5 A
DOIs
Publication statusPublished - May 2005

Keywords

  • 2-phase flow
  • Boiling models
  • Cross-flow heat transfer

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