In-Subchannel Two-Dimensional Flow Structure Induced by Bubble-Liquid Interfacial Forces
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
D8-1 Multi-Scale Multi-Physics Couplings; Multi-Physics Applications to LWR Fuel and Subchannel Anal

Tsutomu Ikeno (Nuclear Fuel Industries, Ltd)
Tatsuya Sasakawa (Nuclear Fuel Industries, Ltd)
Isao Kataoka (Osaka University)


Flow structure induced by bubble-liquid interfacial forces was investigated by using a two- dimensional CMFD technique. The mass, momentum, turbulence energy and bubble diffusion equations were used as the fundamental equations. The basis for these equations was the two- fluid model: the equation of liquid phase was picked up from the equation system theoretically derived for the gas-liquid two-fluid turbulent flow. Existing interfacial force models were newly introduced into the cross-sectional momentum equations. Asymmetry of non-circular channel like sub-channel caused cross-sectional flow patterns which varied with balance among the interfacial forces. The flow structure characterized void fraction distribution in sub-channel.

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