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Heat Transfer Performance for a Falling-Film on Horizontal Flat Tubes

[+] Author Affiliations
X. F. Wang

Xi’an Jiaotong University, Xi’an, China; University of Illinois, Urbana, IL

P. S. Hrnjak

University of Illinois; Creative Thermal Solutions, Urbana, IL

S. Elbel

Creative Thermal Solutions, Urbana, IL

A. M. Jacobi

University of Illinois, Urbana, IL

M. G. He

Xi’an Jiaotong University, Xi’an, China

Paper No. IMECE2011-63970, pp. 43-50; 8 pages
doi:10.1115/IMECE2011-63970
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 10: Heat and Mass Transport Processes, Parts A and B
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5496-9
  • Copyright © 2011 by ASME

abstract

Local and average heat transfer behavior for a falling film on horizontal flat tubes is explored through an experimental approach in this work. Experiments are conducted using water (18 °C) under different heat fluxes and tube spacings, with a range of flow rates that covers all flow modes. It is found that the local heat transfer coefficient decreases with distance from the top of the tube and is almost constant along the axial direction. Heat flux and tube spacing have almost no effect on average heat transfer performance within the experimental range. The average Nusselt number for the flat tube is close to that for round tube in a droplet flow mode, but it is almost twice as large as the round-tube result in the jet mode and sheet modes.

Copyright © 2011 by ASME
Topics: Heat transfer

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