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Title: Microchannel flow boiling mechanisms leading to burnout

Abstract

The boiling mechanisms for microchannel flow are investigated when the channel cross-section in height to width is large (of order 10/1), near its single-phase optimum. A separated flow model was developed which allowed for saturated boiling near the heated base and single-phase flow elsewhere within the channel cross-section. In these high aspect ratio heat sinks, the role of subcooled boiling was found to be insignificant relative to that of saturated boiling, the latter allowing for a doubling of the applied heat load from single-phase operation before burnout was experienced. As the exit mass quality of the saturated region approached one for increasing heat flux, both the model and the experimental case indicated a burnout condition had also been approached. The model underpredicted the measured base temperature, which has been generally noted for saturated boiling in annular two-phase flow.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10152485
Report Number(s):
UCRL-JC-115939; CONF-941142-4
ON: DE94012233
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: American Society of Mechanical Engineers` winter annual meeting,Chicago, IL (United States),6-11 Nov 1994; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; COOLANTS; FLOW MODELS; HEAT SINKS; BOILING; THERMODYNAMICS; HEAT TRANSFER; 420400; HEAT TRANSFER AND FLUID FLOW

Citation Formats

Landram, C.S. Microchannel flow boiling mechanisms leading to burnout. United States: N. p., 1994. Web.
Landram, C.S. Microchannel flow boiling mechanisms leading to burnout. United States.
Landram, C.S. Tue . "Microchannel flow boiling mechanisms leading to burnout". United States. https://www.osti.gov/servlets/purl/10152485.
@article{osti_10152485,
title = {Microchannel flow boiling mechanisms leading to burnout},
author = {Landram, C.S.},
abstractNote = {The boiling mechanisms for microchannel flow are investigated when the channel cross-section in height to width is large (of order 10/1), near its single-phase optimum. A separated flow model was developed which allowed for saturated boiling near the heated base and single-phase flow elsewhere within the channel cross-section. In these high aspect ratio heat sinks, the role of subcooled boiling was found to be insignificant relative to that of saturated boiling, the latter allowing for a doubling of the applied heat load from single-phase operation before burnout was experienced. As the exit mass quality of the saturated region approached one for increasing heat flux, both the model and the experimental case indicated a burnout condition had also been approached. The model underpredicted the measured base temperature, which has been generally noted for saturated boiling in annular two-phase flow.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}

Conference:
Other availability
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