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

2003 ◽  
Vol 2003 (0) ◽  
pp. 237 ◽  
Author(s):  
Xiaodong Sun ◽  
Seungjin Kim ◽  
Mamoru Ishii ◽  
Stephen G. Beus
Keyword(s):  
Transport Equation ◽  
Interfacial Area ◽  
Interfacial Area Transport ◽  
Bubble Interactions ◽  
Interfacial Area Transport Equation ◽  
Confined Flow

Two-Fluid CFD Model of Adiabatic Air-Water Upward Bubbly Flow Through a Vertical Pipe With a One-Group Interfacial Area Transport Equation

2009 ◽  
Author(s):  
Deoras Prabhudharwadkar ◽  
Chris Bailey ◽  
Martin Lopez de Bertodano ◽  
John R. Buchanan
Keyword(s):  
Experimental Data ◽  
Transport Equation ◽  
Bubbly Flow ◽  
Interfacial Area ◽  
Correct Prediction ◽  
Interfacial Area Transport ◽  
One Dimensional ◽  
Interfacial Area Transport Equation ◽  
The One ◽  
Two Fluid

This paper describes in detail the assessment of the CFD code CFX to predict adiabatic liquid-gas two-phase bubbly flow. This study has been divided into two parts. In the first exercise, the effect of Lift Force, Wall Force and the Turbulent Diffusion Force have been assessed using experimental data from the literature for air-water upward bubbly flows through a pipe. The data used here had a characteristic near wall void peaking which was largely influenced by the joint action of the three forces mentioned above. The simulations were performed with constant bubble diameter assuming no bubble interactions. This exercise resulted in selection of the most appropriate closure form and closure coefficients for the above mentioned forces for the range of flow conditions chosen. In the second exercise, the One-Group Interfacial Area Transport equation was introduced in the two-fluid model of CFX. The interfacial area density plays important role in the correct prediction of interfacial mass, momentum and energy transfer and is affected by bubble breakup and coalescence processes in adiabatic flows. The One-Group Interfacial Area Transport Equation (IATE) has been developed and implemented for one-dimensional models and validated using cross-sectional area averaged experimental data over the last decade by various researchers. The original one-dimensional model has been extended to multidimensional flow predictions in this study and the results are presented in this paper. The paper also discusses constraints posed by the commercial CFD code CFX and the solutions worked out to obtain the most accurate implementation of the model.

Implementation and evaluation of one-group interfacial area transport equation in TRACE

2011 ◽  
Vol 241 (3) ◽  
pp. 865-873 ◽  
Author(s):  
Justin D. Talley ◽  
Seungjin Kim ◽  
John Mahaffy ◽  
Stephen M. Bajorek ◽  
Kirk Tien
Keyword(s):  
Transport Equation ◽  
Interfacial Area ◽  
Interfacial Area Transport ◽  
Interfacial Area Transport Equation
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