ICONE11-36114 DEVELOPMENT OF TWO-GROUP INTERFACIAL AREA TRANSPORT EQUATION FOR CONFINED FLOW-I : MODELING OF BUBBLE INTERACTIONS

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概要

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• To provide a dynamic and mechanistic constitutive model for the interfacial area concentration in the two-fluid model, a two-group interfacial area transport equation is developed for confined two-phase flows in this series of papers. This paper presents the modeling of bubble interaction mechanisms in the two-group interfacial area transport equation for confined gas-liquid two-phase flow. The transport equation is applicable to bubbly, cap-turbulent, and churn-turbulent flow regimes. In the two-group interfacial area transport equation, bubbles are categorized into two groups : spherical/distorted bubbles as Group 1 and cap/slug/churn-turbulent bubbles as Group 2. Thus, two sets of equations are used to describe the generation and destruction rates bubble number density, void fraction, and interfacial area concentration for the two groups of bubbles due to bubble expansion and compression, coalescence and disintegration, and phase change. Five major bubble interaction mechanisms are identified for the gas-liquid two-phase flow of interest, such as, bubble coalescence as a result of random collision driven by turbulent eddies, the entrainment of the bubbles following in the wake of preceding bubbles, bubble breakup due to turbulent impact and surface instability for large bubbles, and small bubble shearing-off at the rim of large bubbles. These interaction mechanisms are analytically modeled as the source/sink terms for the transport equations based on certain assumptions for the confined flow. The models include both intra-group (within a certain group) and inter-group (between two groups) bubble interactions. A complete set of models close the two-group interfacial area transport equation, which has embedded the mechanisms of the flow regime transition. The comparisons of the prediction by the one-dimensional two-group interfacial area transport equation with experimental data are presented in the second paper of this series.

• 一般社団法人日本機械学会の論文

著者

• Ishii Mamoru

  Thermal-hydraulics And Reactor Safety Laboratory School Of Nuclear Engineering Purdue University

• Kim Seungjin

  Thermal-hydraulics And Reactor Safety Laboratory School Of Nuclear Engineering Purdue University

• Sun Xiaodong

  Thermal-hydraulics and Reactor Safety Laboratory School of Nuclear Engineering, Purdue University

• Beus Stephen

  Bettis Atomic Power Laboratory, Bechtel Bettis, Inc.

• Beus Stephen

  Bettis Atomic Power Laboratory Bechtel Bettis Inc.

• Sun Xiaodong

  Thermal-hydraulics And Reactor Safety Laboratory School Of Nuclear Engineering Purdue University

関連論文

• ICONE11-36263 INTERFACIAL STRUCTURES IN DOWNWARD TWO-PHASE BUBBLY FLOW
• ICONE11-36115 DEVELOPMENT OF TWO-GROUP INTERFACIAL AREA TRANSPORT EQUATION FOR CONFINED FLOW-II : MODEL EVALUATION
• ICONE11-36114 DEVELOPMENT OF TWO-GROUP INTERFACIAL AREA TRANSPORT EQUATION FOR CONFINED FLOW-I : MODELING OF BUBBLE INTERACTIONS

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