Numerical prediction of a flashing flow of saturated water at high pressure

Transient fluid velocity and pressure fields in a pressurized water reactor (PWR) steam generator (SG) secondary side during the blowdown period of a feedwater line break (FWLB) accident were numerically simulated employing the saturated water flashing model. This model is based on the assumption th...

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Main Authors:	Jong Chull Jo, Jae Jun Jeong, Byong Jo Yun, Frederick J. Moody
Format:	Article
Language:	English
Published:	Elsevier 2018-10-01
Series:	Nuclear Engineering and Technology
Online Access:	http://www.sciencedirect.com/science/article/pii/S173857331830130X

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spelling	doaj-e72aefc4c409440ca1f82dde675637a32020-11-24T23:14:07ZengElsevierNuclear Engineering and Technology1738-57332018-10-0150711731183Numerical prediction of a flashing flow of saturated water at high pressureJong Chull Jo0Jae Jun Jeong1Byong Jo Yun2Frederick J. Moody3Korea Institute of Nuclear Safety, Reactor System Evaluation Dept., 62 Gwahak-ro, Yusung-gu, Daejon, 34142, South Korea; Pusan National University, School of Mechanical Engineering, 63 Busandaehak-ro, Geumjeong-gu, Busan, 46241, South Korea; Corresponding author. Korea Institute of Nuclear Safety, Reactor System Evaluation Dept., 62 Gwahak-ro, Yusung-gu, Daejon, 34142, South Korea.Pusan National University, School of Mechanical Engineering, 63 Busandaehak-ro, Geumjeong-gu, Busan, 46241, South KoreaPusan National University, School of Mechanical Engineering, 63 Busandaehak-ro, Geumjeong-gu, Busan, 46241, South KoreaConsultant, 2125 N. Olive Ave. D-33, Turlock, CA, 95382, USATransient fluid velocity and pressure fields in a pressurized water reactor (PWR) steam generator (SG) secondary side during the blowdown period of a feedwater line break (FWLB) accident were numerically simulated employing the saturated water flashing model. This model is based on the assumption that compressed water in the SG is saturated at the beginning and decompresses into the two-phase region where saturated vapor forms, creating a mixture of steam bubbles in water by bulk boiling. The numerical calculations were performed for two cases of which the outflow boundary conditions are different from each other; one is specified as the direct blowdown discharge to the atmosphere and the other is specified as the blowdown discharge to an extended calculation domain with atmospheric pressure on its boundary. The present simulation results obtained using the two different outflow boundary conditions were discussed through a comparison with the predictions using a simple non-flashing model neglecting the effects of phase change. In addition, the applicability of each of the non-flashing water discharge and saturated water flashing models for the confirmatory assessments of new SG designs was examined.http://www.sciencedirect.com/science/article/pii/S173857331830130X
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Jong Chull Jo Jae Jun Jeong Byong Jo Yun Frederick J. Moody
spellingShingle	Jong Chull Jo Jae Jun Jeong Byong Jo Yun Frederick J. Moody Numerical prediction of a flashing flow of saturated water at high pressure Nuclear Engineering and Technology
author_facet	Jong Chull Jo Jae Jun Jeong Byong Jo Yun Frederick J. Moody
author_sort	Jong Chull Jo
title	Numerical prediction of a flashing flow of saturated water at high pressure
title_short	Numerical prediction of a flashing flow of saturated water at high pressure
title_full	Numerical prediction of a flashing flow of saturated water at high pressure
title_fullStr	Numerical prediction of a flashing flow of saturated water at high pressure
title_full_unstemmed	Numerical prediction of a flashing flow of saturated water at high pressure
title_sort	numerical prediction of a flashing flow of saturated water at high pressure
publisher	Elsevier
series	Nuclear Engineering and Technology
issn	1738-5733
publishDate	2018-10-01
description	Transient fluid velocity and pressure fields in a pressurized water reactor (PWR) steam generator (SG) secondary side during the blowdown period of a feedwater line break (FWLB) accident were numerically simulated employing the saturated water flashing model. This model is based on the assumption that compressed water in the SG is saturated at the beginning and decompresses into the two-phase region where saturated vapor forms, creating a mixture of steam bubbles in water by bulk boiling. The numerical calculations were performed for two cases of which the outflow boundary conditions are different from each other; one is specified as the direct blowdown discharge to the atmosphere and the other is specified as the blowdown discharge to an extended calculation domain with atmospheric pressure on its boundary. The present simulation results obtained using the two different outflow boundary conditions were discussed through a comparison with the predictions using a simple non-flashing model neglecting the effects of phase change. In addition, the applicability of each of the non-flashing water discharge and saturated water flashing models for the confirmatory assessments of new SG designs was examined.
url	http://www.sciencedirect.com/science/article/pii/S173857331830130X
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Numerical prediction of a flashing flow of saturated water at high pressure

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