0

Full Content is available to subscribers

Subscribe/Learn More  >

Liquid Crystal Thermography Studies in Pool Boiling in Water at Subatmospheric Pressures

[+] Author Affiliations
Kiran Talari, Ranganathan Kumar

University of Central Florida, Orlando, FL

Paper No. ICNMM2007-30193, pp. 67-74; 8 pages
doi:10.1115/ICNMM2007-30193
From:
  • ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 5th International Conference on Nanochannels, Microchannels, and Minichannels
  • Puebla, Mexico, June 18–20, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4272-X | eISBN: 0-7918-3800-5
  • Copyright © 2007 by ASME

abstract

An experimental nucleate pool boiling study in water is presented for a range of constant heat flux (q") operated at three different system pressures (P∞ ). Experiments were run at 6.2kPa, 7.0kPa and 8.0kPa with a constant heat flux varying from 1.88kW/m2 to 4.55kW/m2 . The growth of vapor bubbles has been analyzed from inception to lift–off from an electrically heated 0.05 mm thick horizontal Fecralloy surface. Liquid crystal thermography, a non-intrusive technique, is used for the determination of surface temperature distributions. This technique offers some advantages, including ease of handling, reasonable accuracy, and spatial resolution of the temperature field. The color image processing is used to obtain quantitative temperature information from the TLC images captured with a reasonable accuracy and resolution. Boiling parameters like bubble size, contact and the frequency are determined. The bubble cycle with a neck formation is observed at the lowest investigated pressures 6.2kPa and 7.0kPa with a constant heat flux of 1.88kW/m2 . From the corresponding TLC images it is clearly seen that a dry spot caused by evaporation of microlayer forms beneath the vapor bubble during its growth. An increase in either the heat flux or the system pressure results in a decrease in the size of the bubble and an increase in bubble frequency.

Copyright © 2007 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