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Research Papers: Nuclear Power

Modeling Pressure Fluctuation With Cross Flow in a Tight-Lattice Rod Bundle

[+] Author and Article Information
Weizhong Zhang1

Thermal and Fluid Engineering Group, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japanzhang.weizhong@jaea.go.jp

Hiroyuki Yoshida

Thermal and Fluid Engineering Group, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japanyoshida.hiroyuki@jaea.go.jp

Kazuyuki Takase

Thermal and Fluid Engineering Group, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japantakase.kazuyuki@jaea.go.jp

1

Corresponding author.

J. Eng. Gas Turbines Power 131(2), 022901 (Dec 30, 2008) (6 pages) doi:10.1115/1.3032392 History: Received July 22, 2008; Revised August 18, 2008; Published December 30, 2008

To explore the mechanism of differential pressure fluctuation inducing cross flow between subchannels in the tight-lattice rod bundle, an evaluation method is presented, which permits the prediction in detail of the unsteady differential pressure fluctuation behavior between subchannels. The instantaneous fluctuation of differential pressure between two subchannels in gas-liquid slug flow regime is deemed as a result of the intermittent nature of slug flow in each subchannel. The method is based on the detailed numerical simulation result of two-phase flow that pressure drop occurs mainly in the liquid slug region and it is, however, negligibly small in the bubble region. The instantaneous fluctuation of differential pressure between two subchannels is associated with pressure gradient in the liquid slug for each channel. In addition to a hydrostatic gradient, acceleration and frictional gradients are taken into account to predict pressure gradient in the liquid slug. This method used in conjunction with the numerical simulation code works satisfactorily to reproduce numerical simulation results for instantaneous fluctuation of differential pressure between two modeled subchannels. It is shown that the static head, acceleration, and frictional pressure drops in the liquid slug are main contributions to the fluctuation of differential pressure between subchannels.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Modeled single subchannel without cross flow

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Figure 2

Modeled two subchannels with cross flow

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Figure 3

Simulation results: an example of slug behavior

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Figure 4

Axial cross-sectional-averaged pressure and void fraction distributions

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Figure 5

Detailed pressure distribution in a slug unit

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Figure 6

Cross-sectional-averaged pressure and void distributions in a slug unit

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Figure 7

Schematic of model for evaluation of pressure drop

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Figure 8

Calculation of pressure in question

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Figure 9

Evaluation of model with simulation results for single subchannel without cross flow

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Figure 10

Evaluation of model with simulation results for subchannels with cross flow

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Figure 11

Evaluation of fluctuation of differential pressure between subchannels

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