0

Full Content is available to subscribers

Subscribe/Learn More  >

Conjugate Heat Transfer in Annular Laminar Film Condensation in Microchannels: Comparison of Numerical Model to Experimental Results

[+] Author Affiliations
Stefano Nebuloni, John R. Thome

Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland

Davide Del Col

University of Padova, Padova, Italy

Paper No. IHTC14-23003, pp. 245-252; 8 pages
doi:10.1115/IHTC14-23003
From:
  • 2010 14th International Heat Transfer Conference
  • 2010 14th International Heat Transfer Conference, Volume 2
  • Washington, DC, USA, August 8–13, 2010
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4937-8 | eISBN: 978-0-7918-3879-2
  • Copyright © 2010 by ASME

abstract

A comparison of the recently proposed numerical model for annular laminar film condensation heat transfer in microchannels of different internal shapes (circular, square, rectangular, etc.), including the effects of conjugate heat conduction in the channel walls, is made versus recent independent experimental results experiencing this effect. Notably, the thinning of the condensate film induced by surface tension due to gravity forces and shape of the surface, also known as the ‘Grigorig’ effect, has a strong consequence on the local heat transfer coefficient in condensation. The model, which is based on a finite volume formulation of the Navier-Stokes and energy equations for the liquid phase only, accounts for the contributions of the surface tension, axial shear stresses and gravitational forces and for the conjugate effects of axial and peripheral wall conduction and nonuniform heat flux. The model was previously validated versus experimental data available in the literature without accounting for conjugate effects, predicting microchannel heat transfer data to within 20% or better. Specifically, the updated version of the model includes the coupling between the thin film fluid dynamics, the heat transfer in the condensing fluid and the heat conduction in the channel wall. Since it is imperative to demonstrate that numerical heat transfer models are accurate and reliable, the present paper focuses on validating this new conjugate model versus recent actual experimental data for various small channels and test fluids experiencing this effect. The results are very encouraging and are presented here.

Copyright © 2010 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In