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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

SINGLE-PHASE CONVECTIVE HEAT TRANSFER IN A ROD BUNDLE CONTAINING PARTIAL BLOCKAGE

Ngoc Hung Nguyen
Korea University of Science and Technology, Gajeong-ro 217, Yuseong-Gu, Daejeon, 305-350, Republic of Korea; Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yuseong-gu, Daejeon, 305-353, Republic of Korea

Jong-Rok Kim
Korea Atomic Energy Research Institute, Daedeok-Daero 989 Beon-Gil 111, Yuseong-Gu, Daejeon, KOREA

SeungHyun Hong
Korea Atomic Energy Research Institute, Daedeok- Daero 989-111, Yuseong-gu, Daejeon, 305-353, Republic of Korea

Sang-Ki Moon
Korea Atomic Energy Research Institute Daedeok-daero 989-111, Yuseong-gu, Daejeon, 305-353, Republic of Korea

Chul-Hwa Song
Korea University of Science and Technology, Gajeong-ro 217, Yuseong-Gu, Daejeon, 305-350, Republic of Korea; Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yuseong-gu, Daejeon, 305-353, Republic of Korea

Abstract

In the hypothesis of a large break loss-of-coolant accident (LB LOCA), during the early stage of reflooding phase, the dominant heat transfer mechanism is mainly single-phase convective heat transfer to vapor. A series of experiments on the wall-to-vapor convective heat transfer has been conducted in 5×5 rod bundles containing 3×3 ballooned rods of 90% flow blockage ratio. The experimental results showed significant increase in local heat transfer downstream of the blockage. The increase in heat transfer might result from flow separation occurred due to the expansion at the top end of the blockage. The single-phase heat transfer enhancement models implemented in the COBRA-TF code underestimated local heat transfer in the blockage downstream region. Therefore, a new flow blockage correlation was proposed to improve the prediction capability of the conventional models in the COBRA-TF code by more accurately describing the effect of flow separation. The new correlation showed good agreement with the experimental data.

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