0

Full Content is available to subscribers

Subscribe/Learn More  >

Synergism of Binary Mixtures Wettability and Cover Porosity on Enhanced Pool Boiling Heat Transfer

[+] Author Affiliations
Elva Meléndez, René Reyes

Universidad de las Américas-Puebla

Paper No. IMECE2004-60565, pp. 577-582; 6 pages
doi:10.1115/IMECE2004-60565
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 2
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4711-X | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

The wettability of the system in capillary covers is an important element to increase the boiling heat transfer on the coverings. The sessile drop methodology allows the evaluation of either the surface energy of solids or the interfacial energy of liquids, and from both the system’s wettability. This methodology was tested with an experimental set up built for this study. The surface energies calculated for solids and metal foils used for construction of capillary coverings were in accordance with previous experimental results. The same methodology is used for measuring interfacial energies of the liquids used for increasing boiling heat transfer like ethanol-water mixtures. The mixture with 16% ethanol by weight had the lowest contact angle (associated to the lowest interfacial energy) and produced the highest convective heat transfer coefficient, h. Thus, the maximum for h correlates with an increase in the wettability of this system. This behavior is related to that observed as the critical micelial concentration (cmc) for surfactants, that produce the lowest interfacial energy of the liquid. Thus a set of experiments was developed to correlate the binary mixture behavior around the concentration with maximum heat transfer coefficient with the cmc boiling behavior. The surfactant sodium lauryl sulfate (SLS) produced an increase of the wettability of the solid surface with the addition of 100 ppm (or less) that is its cmc. The h values increase with the addition of SLS up to 100 ppm but do not change if the concentration of surfactant is higher than that value. The maximum heat transfer coefficient is obtained with the cmc of SLS in water, and with the 16% by weight ethanol-water mixture, both having the highest wettability. Porous coverings were tested with two covering’s thickness. A synergistic effect is found for the appropriate cover thickness combined with either a 16% by weight ethanol-water mixture or water with the cmc of SLS.

Copyright © 2004 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