0

Full Content is available to subscribers

Subscribe/Learn More  >

Characteristics of Two-Component Two-Phase Flow and Heat Transfer in a Flat Microchannel

[+] Author Affiliations
Matthew L. Roesle, F. A. Kulacki

University of Minnesota, Minneapolis, MN

Paper No. HT2008-56084, pp. 395-405; 11 pages
doi:10.1115/HT2008-56084
From:
  • ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
  • Heat Transfer: Volume 2
  • Jacksonville, Florida, USA, August 10–14, 2008
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4848-7 | eISBN: 0-7918-3832-3
  • Copyright © 2008 by ASME

abstract

Experiments are reported on heat transfer and flow characteristics of two-component, two-phase flow in a flat microchannel with cross-section 0.1 × 30 mm. The channel is heated at nearly constant wall temperature on one side for a length of 30 mm. Water and FC-72 ® are the working fluids, and local temperature data and high-speed video of the two-phase flows are reported. Total mass flux ranges from 40 and 467 kg/m2 s, with mass fraction of FC-72 between 0.04 and 0.69. All flows are sub-cooled up to 32 °C below the saturation temperature of FC-72 and wall heat flux is controlled so that boiling of the FC-72 component occurs. The rate of FC-72 flow through the channel is unsteady due to conditions upstream of the microchannel, which cause temperature fluctuations in the channel. The components remain distinct within the microchannel, as predicted by the low Weber numbers of the flows, and the fraction of the channel cross-section occupied by FC-72 varies inversely with water flow rate. At high water flow rates waviness develops in the interface between the FC-72 and water streams and some droplets of FC-72 leave the main body of the flow. Under some conditions pressure drop oscillation in the boiling FC-72 stream is observed. Estimates of the average heat transfer coefficient are obtained based on average wall temperatures. Large mass fractions of FC-72 reduce overall heat transfer coefficients, indicating that only small mass fractions of FC-72 are needed to produce heat transfer enhancement. Upstream mixing of the two components is seen as key step in fluid management to assure improved heat transfer.

Copyright © 2008 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