Forced convective flow and heat transfer of upward cocurrent air-water slug flow in vertical plain and swirl tubes

Shyy-Woei Chang, Tsun Lirng Yang

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

This experimental study comparatively examined the two-phase flow structures, pressured drops and heat transfer performances for the cocurrent air-water slug flows in the vertical tubes with and without the spiky twisted tape insert. The two-phase flow structures in the plain and swirl tubes were imaged using the computerized high frame-rate videography with the Taylor bubble velocity measured. Superficial liquid Reynolds number (Re L ) and air-to-water mass flow ratio (AW), which were respectively in the ranges of 4000-10000 and 0.003-0.02 were selected as the controlling parameters to specify the flow condition and derive the heat transfer correlations. Tube-wise averaged void fraction and Taylor bubble velocity were well correlated by the modified drift flux models for both plain and swirl tubes at the slug flow condition. A set of selected data obtained from the plain and swirl tubes was comparatively examined to highlight the impacts of the spiky twisted tape on the air-water interfacial structure and the pressure drop and heat transfer performances. Empirical heat transfer correlations that permitted the evaluation of individual and interdependent Re L and AW impacts on heat transfer in the developed flow regions of the plain and swirl tubes at the slug flow condition were derived.

Original languageEnglish
Pages (from-to)1087-1099
Number of pages13
JournalExperimental Thermal and Fluid Science
Volume33
Issue number7
DOIs
Publication statusPublished - 2009 Oct 1

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Nuclear Energy and Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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