Bubble behavior in liquid-gas two-phase flow behind a cross-shaped obstacle in a vertical circular duct

K. Takase1, G. Kawasaki1, K. Ueta1
1 Department of Nuclear System Safety Engineering, Nagaoka University of Technology, Japan

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Abstract

Grid spacers installed in subchannels of fuel assemblies for nuclear reactors can promote heat transfer. However, the fluid velocity and bubble behavior are greatly affected as the cross-sectional area of the flow passage changes. Therefore, the void fraction distribution behind the obstacle that simulates the grid spacer shape simply was measured by using a wire mesh sensor (WMS) system. Moreover, a two-phase flow analysis was performed to investigate the effect of the obstacle on the bubble behavior in a vertical duct.

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References

[1]. Prasser, H. M., Böttger, A. and Zschau, J., “A New Electrode-Mesh Tomograph for Gas-Liquid Flows,” Flow Measurement and Instrumentation, 9, 1998.
[2]. H. M. Prasser, H. M., Krepper E. and Lucas, D., “Fast Wire-Mesh Sensors for Gas-Liquid Flows and Decomposition of Gas Fraction Profiles According to Bubble Size Classes”, Second Japanese-European Two-Phase Flow Group Meeting, Tsukuba, Japan, September, 25-29, 2000.
[3]. Prasser, H. M., Scholz, D., and Zippe, C., 2001, “Bubble Size Measurement Using Wire-Mesh Sensors”, Flow Measurement and Instrumentation, 12, 4, 2001.
[4]. Douce1, A., Mimouni1, A.., Guingo1, M., Morel2, M., J. Laviéville1, J. and Baudry1, C., “Validation of Neptune CFD 1.0.8 for Adiabatic Bubbly Flow and Boiling Flow”, CFD4NRS-3, September, 14-16, Washington DC, USA, 2010.