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An improved mechanistic critical heat flux model for subcooled flow boiling

Abstract

Based on the bubble coalescence adjacent to the heated wall as a flow structure for CHF condition, Chang and Lee developed a mechanistic critical heat flux (CHF) model for subcooled flow boiling. In this paper, improvements of Chang-Lee model are implemented with more solid theoretical bases for subcooled and low-quality flow boiling in tubes. Nedderman-Shearer`s equations for the skin friction factor and universal velocity profile models are employed. Slip effect of movable bubbly layer is implemented to improve the predictability of low mass flow. Also, mechanistic subcooled flow boiling model is used to predict the flow quality and void fraction. The performance of the present model is verified using the KAIST CHF database of water in uniformly heated tubes. It is found that the present model can give a satisfactory agreement with experimental data within less than 9% RMS error. 9 refs., 5 figs. (Author)
Authors:
Kwon, Young Min; [1]  Chang, Soon Heung [2] 
  1. Korea Atomic Energy Research Institute, Taejon (Korea, Republic of)
  2. Korea Advanced Institute of Science and Technology, Taejon (Korea, Republic of)
Publication Date:
Dec 31, 1997
Product Type:
Conference
Report Number:
ETDE/KR-99732628; CONF-9710296-
Reference Number:
SCA: 420400; PA: KR-99:000313; EDB-99:037431; SN: 99002059940
Resource Relation:
Conference: Korean Nuclear Society autumn meeting, Taegu (Korea, Republic of), 24-25 Oct 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the korean nuclear society autumn meeting vol I, October 24-25, 1997 Taegu, Korea; PB: 797 p.
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; CRITICAL HEAT FLUX; HEAT TRANSFER; BOILING; COALESCENCE; BUBBLES; BUBBLE GROWTH; SUBCOOLED BOILING; TUBES; FRICTION FACTOR; FLUID FLOW; SLIP; SLIP FLOW; VOID FRACTION
OSTI ID:
324154
Research Organizations:
Korean Nuclear Society, Taejon (Korea, Republic of)
Country of Origin:
Korea, Republic of
Language:
English
Other Identifying Numbers:
Other: ON: DE99732628; TRN: KR9900313
Availability:
OSTI as DE99732628
Submitting Site:
KR
Size:
pp. 552-557
Announcement Date:
Apr 01, 1999

Citation Formats

Kwon, Young Min, and Chang, Soon Heung. An improved mechanistic critical heat flux model for subcooled flow boiling. Korea, Republic of: N. p., 1997. Web.
Kwon, Young Min, & Chang, Soon Heung. An improved mechanistic critical heat flux model for subcooled flow boiling. Korea, Republic of.
Kwon, Young Min, and Chang, Soon Heung. 1997. "An improved mechanistic critical heat flux model for subcooled flow boiling." Korea, Republic of.
@misc{etde_324154,
title = {An improved mechanistic critical heat flux model for subcooled flow boiling}
author = {Kwon, Young Min, and Chang, Soon Heung}
abstractNote = {Based on the bubble coalescence adjacent to the heated wall as a flow structure for CHF condition, Chang and Lee developed a mechanistic critical heat flux (CHF) model for subcooled flow boiling. In this paper, improvements of Chang-Lee model are implemented with more solid theoretical bases for subcooled and low-quality flow boiling in tubes. Nedderman-Shearer`s equations for the skin friction factor and universal velocity profile models are employed. Slip effect of movable bubbly layer is implemented to improve the predictability of low mass flow. Also, mechanistic subcooled flow boiling model is used to predict the flow quality and void fraction. The performance of the present model is verified using the KAIST CHF database of water in uniformly heated tubes. It is found that the present model can give a satisfactory agreement with experimental data within less than 9% RMS error. 9 refs., 5 figs. (Author)}
place = {Korea, Republic of}
year = {1997}
month = {Dec}
}