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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Heat Transfer Behavior in a Sodium Loop due to Inlet Flow Change: Experiments and Numerical Calculations

Yong-bum Lee
Korea Atomic Energy Research Institute P.O. Box 105, Yuseong, Daejeon, 305-600, Korea

Min-Joon Kim
KALMIER Sodium Experimental Technology Development Korea Atomic Energy Reseach Institute P. O. Box 105 Yusong, Daejon, 305-600 Republic of Korea

Seok-Ki Choi
Fast Reactor Development Division, Korea Atomic Energy Research Institute 150-1 Deokjin-dong, Yuseong-gu, Daejeon, 305-353, Korea

Yong Kyun Kim
Department of Mechanical Engineering Dong-A University 840 Hadan-dong, Saha-gu, Pusan 604-714, Korea

Ho-Yun Nam
KALMIER Sodium Experimental Technology Development Korea Atomic Energy Reseach Institute P. O. Box 105 Yusong, Daejon, 305-600 Republic of Korea

DOI: 10.1615/IHTC11.2150
pages 57-62

Abstract

Heat transfer behavior due to an inlet flow change is investigated experimentally and numerically in order to investigate the safety of the natural circulation operation in the decay heat removal in liquid metal reactors. A symmetrically shaped and unsymmetrically heated sodium loop is considered where the natural circulation is represented by a fluid injection. It is found that the flow developed by the urisymmetrical heating in the sodium loop is reversed by the fluid injection at a certain inlet flow rate Vbr. It is also found that near the reversal, there is a sudden increase in temperature, which is very dangerous in reactor operations. As the flow rate grows beyond Vbr, the temperature decreases, which implies the possibility of a forced convection operation in the decay heat removal. A one-dimensional model is considered and numerical calculations for the model are also performed. The numerical results are compared with the experimental results.

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