BROWSE

Related Researcher

Author's Photo

Lee, Jaeseon
Innovative Thermal Engineering Lab (ITEL)
Research Interests
  • Energy conversion utilizing renewable/recyclable thermal sources
  • Thermal management of electronics and high heat-flux devices
  • Working fluids characterizing for thermo-fluid physics and systems

ITEM VIEW & DOWNLOAD

Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications: Part II - heat transfer characteristics

Cited 162 times inthomson ciCited 0 times inthomson ci
Title
Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications: Part II - heat transfer characteristics
Author
Lee, JaeseonMudawar, Issam
Keywords
Micro-channels; Flow boiling; Refrigeration
Issue Date
2005-02
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.48, no.5, pp.941 - 955
Abstract
This paper is the second of a two-part study concerning two-phase flow and heat transfer characteristics of R134a in a micro-channel heat sink incorporated as an evaporator in a refrigeration cycle. Boiling heat transfer coefficients were measured by controlling heat flux (q" = 15.9 - 93.8 W/cm(2)) and vapor quality (x(e) = 0.26 - 0.87) over a broad range of mass velocity. While prior studies point to either nucleate boiling or annular film evaporation (convective flow boiling) as dominant heat transfer mechanisms in small channels, the present study shows heat transfer is associated with different mechanisms for low, medium and high qualities. Nucleate boiling occurs only at low qualities (x(e) < 0.05) corresponding to very low heat fluxes, and high fluxes produce medium quality (0.05 < x(e) < 0.55) or high quality (x(e) > 0.55) flows dominated by annular film evaporation. Because of the large differences in heat transfer mechanism between the three quality regions, better predictions are possible by dividing the quality range into smaller ranges corresponding to these flow transitions. A new heat transfer coefficient correlation is recommended which shows excellent predictions for both R134a and water.
URI
Go to Link
DOI
10.1016/j.ijheatmasstransfer.2004.09.019
ISSN
0017-9310
Appears in Collections:
MEN_Journal Papers
Files in This Item:
2-s2.0-13644254606.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU