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Improvements to TRAC models of condensing stratified flow. Pt. 1. Co-current flow

Technical Report:

Abstract

Direct contact condensation in stratified flow is an important phenomenon in LOCA analyses. In this report, the TRAC interfacial heat transfer model for stratified condensing flow has been assessed against the Bankoff experiments. A rectangular channel option has been added to the code to represent the experimental geometry. In almost all cases the TRAC heat transfer coefficient (HTC) over-predicts the condensation rates and in some cases it is so high that the predicted steam is sucked in from the normal outlet in order to conserve mass. Based on their cocurrent and countercurrent condensing flow experiments, Bankoff and his students (Lim 1981, Kim 1985) developed HTC models from the two cases. The replacement of the TRAC HTC with either of Bankoff`s models greatly improves the predictions of condensation rates in the experiment with cocurrent condensing flow. However, the Bankoff HTC for countercurrent flow is preferable because it is based only on the local quantities rather than on the quantities averaged from the inlet. (author).
Publication Date:
Dec 01, 1991
Product Type:
Technical Report
Report Number:
AEA-RS-1077
Reference Number:
SCA: 420400; PA: AIX-24:001361; SN: 93000913135
Resource Relation:
Other Information: PBD: Dec 1991
Subject:
42 ENGINEERING; FLOW MODELS; T CODES; HEAT TRANSFER; LOSS OF COOLANT; TWO-PHASE FLOW; VAPOR CONDENSATION; 420400; HEAT TRANSFER AND FLUID FLOW
OSTI ID:
10108741
Research Organizations:
AEA Reactor Services, Winfrith (United Kingdom)
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Other: ON: DE93609340; CNN: Project AEA LHT 1.1.9; NSRMU HTH/PWR/04; TRN: GB9203351001361
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
GBN
Size:
[49] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Zhang, Q, and Leslie, D C. Improvements to TRAC models of condensing stratified flow. Pt. 1. Co-current flow. United Kingdom: N. p., 1991. Web.
Zhang, Q, & Leslie, D C. Improvements to TRAC models of condensing stratified flow. Pt. 1. Co-current flow. United Kingdom.
Zhang, Q, and Leslie, D C. 1991. "Improvements to TRAC models of condensing stratified flow. Pt. 1. Co-current flow." United Kingdom.
@misc{etde_10108741,
title = {Improvements to TRAC models of condensing stratified flow. Pt. 1. Co-current flow}
author = {Zhang, Q, and Leslie, D C}
abstractNote = {Direct contact condensation in stratified flow is an important phenomenon in LOCA analyses. In this report, the TRAC interfacial heat transfer model for stratified condensing flow has been assessed against the Bankoff experiments. A rectangular channel option has been added to the code to represent the experimental geometry. In almost all cases the TRAC heat transfer coefficient (HTC) over-predicts the condensation rates and in some cases it is so high that the predicted steam is sucked in from the normal outlet in order to conserve mass. Based on their cocurrent and countercurrent condensing flow experiments, Bankoff and his students (Lim 1981, Kim 1985) developed HTC models from the two cases. The replacement of the TRAC HTC with either of Bankoff`s models greatly improves the predictions of condensation rates in the experiment with cocurrent condensing flow. However, the Bankoff HTC for countercurrent flow is preferable because it is based only on the local quantities rather than on the quantities averaged from the inlet. (author).}
place = {United Kingdom}
year = {1991}
month = {Dec}
}