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Title: An experimental study of convective boiling in a partially heated horizontal channel with offset strip fins

Abstract

Measured local heat transfer data and visually observed two-phase behavior are reported for convective boiling of methanol and water in a partially heated horizontal channel with offset strip fins. In this study, a special test section was used that permitted direct visual observation of the two-phase flow while simultaneously measuring the convective boiling heat transfer coefficient at several locations along the channel. One wall of the channel was heated while the opposite and lateral walls were adiabatic. Measured local heat transfer coefficients on the heated portion of the channel wall were obtained for top heating and bottom heating of the horizontal channel. For the conditions examined here, the two-phase flow was in the stratified, wavy, or annular flow regime over almost the entire length of the channel. It was visually observed that virtually no nucleate boiling is present when the flow is in the regimes. A flow regime map is presented, which summarizes the observed two-phase flow characteristics. At the same quality and mass flux levels, the measured heat transfer coefficients for top heating and bottom heating were found to be virtually the same for the conditions examined here. In addition for the same quality and mass flux, the convectivemore » boiling heat transfer coefficients for top heating and bottom heating agree well with the results for comparable experiments with the channel oriented vertically. Hence, prior to dryout of the liquid film, the boiling heat transfer performance appears to be insensitive to channel orientation. Observed differences in the dryout conditions for top heating and bottom heating are also discussed.« less

Authors:
; ;  [1]
  1. Univ. of California, Berkeley (United States)
Publication Date:
OSTI Identifier:
5940043
Resource Type:
Journal Article
Journal Name:
Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)
Additional Journal Information:
Journal Volume: 110:1; Journal ID: ISSN 0022-1481
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; BOILING; HEAT TRANSFER; CONVECTION; CRYOGENICS; DATA; FINS; METHANOL; REFRIGERATING MACHINERY; TWO-PHASE FLOW; WATER; ALCOHOLS; ENERGY TRANSFER; FLUID FLOW; HYDROGEN COMPOUNDS; HYDROXY COMPOUNDS; INFORMATION; MACHINERY; MASS TRANSFER; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Mandrusiak, G D, Carey, V P, and Xu, X. An experimental study of convective boiling in a partially heated horizontal channel with offset strip fins. United States: N. p., 1988. Web. doi:10.1115/1.3250456.
Mandrusiak, G D, Carey, V P, & Xu, X. An experimental study of convective boiling in a partially heated horizontal channel with offset strip fins. United States. https://doi.org/10.1115/1.3250456
Mandrusiak, G D, Carey, V P, and Xu, X. 1988. "An experimental study of convective boiling in a partially heated horizontal channel with offset strip fins". United States. https://doi.org/10.1115/1.3250456.
@article{osti_5940043,
title = {An experimental study of convective boiling in a partially heated horizontal channel with offset strip fins},
author = {Mandrusiak, G D and Carey, V P and Xu, X},
abstractNote = {Measured local heat transfer data and visually observed two-phase behavior are reported for convective boiling of methanol and water in a partially heated horizontal channel with offset strip fins. In this study, a special test section was used that permitted direct visual observation of the two-phase flow while simultaneously measuring the convective boiling heat transfer coefficient at several locations along the channel. One wall of the channel was heated while the opposite and lateral walls were adiabatic. Measured local heat transfer coefficients on the heated portion of the channel wall were obtained for top heating and bottom heating of the horizontal channel. For the conditions examined here, the two-phase flow was in the stratified, wavy, or annular flow regime over almost the entire length of the channel. It was visually observed that virtually no nucleate boiling is present when the flow is in the regimes. A flow regime map is presented, which summarizes the observed two-phase flow characteristics. At the same quality and mass flux levels, the measured heat transfer coefficients for top heating and bottom heating were found to be virtually the same for the conditions examined here. In addition for the same quality and mass flux, the convective boiling heat transfer coefficients for top heating and bottom heating agree well with the results for comparable experiments with the channel oriented vertically. Hence, prior to dryout of the liquid film, the boiling heat transfer performance appears to be insensitive to channel orientation. Observed differences in the dryout conditions for top heating and bottom heating are also discussed.},
doi = {10.1115/1.3250456},
url = {https://www.osti.gov/biblio/5940043}, journal = {Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)},
issn = {0022-1481},
number = ,
volume = 110:1,
place = {United States},
year = {Mon Feb 01 00:00:00 EST 1988},
month = {Mon Feb 01 00:00:00 EST 1988}
}