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Simulations of Two-phase Flows Using Interfacial Area Transport Equation

Wang, Xia
http://rave.ohiolink.edu/etdc/view?acc_num=osu1282066341

Abstract Details

2010, Doctor of Philosophy, Ohio State University, Nuclear Engineering.
The current study focuses on providing a reliable computational fluid dynamics (CFD) tool for two-phase flow simulations, which is capable of capturing dynamic changes of interfacial structures and achieving accurate predictions of flow behaviors. A set of interfacial area transport equations (IATEs), which dynamically evaluates the interfacial area concentration, was successfully implemented into a CFD software package, namely, Fluent. The interfacial area concentration is a key parameter in modeling the interfacial transfer terms in the two-fluid model due to mechanical and thermal non-equilibrium between the two phases. Given the various flow regimes in two-phase flows, one-group IATE and two-group IATE developed in the literature were separately incorporated into the two-fluid model and subsequently validated under different flow conditions: liquid-liquid two-component bubbly; air-water bubbly, cap-bubbly, and churn-turbulent flows. Numerical results obtained from the two-fluid model incorporated with the IATE models were generally in good agreement with the experimental data. A set of adjustable model coefficients was also established for three-dimensional simulations when the influence of the lateral phase distribution in a circular flow channel on the one-group IATE model was considered. In addition, contributions of the bubble interaction mechanisms and interfacial forces to the phase distributions of two-phase flow were numerically investigated. It was observed that the lift force was significant for the phase distributions in gas-liquid two-phase flows; however it might cause convergence issues when large bubbles exist in the flow field of interest. Furthermore, a mathematical property, i.e., the well-posedness of the proposed one-dimensional three-field model with the two-group IATE model, was studied. The necessary condition to ensure well-posedness was obtained using characteristic analysis. The momentum flux parameters were introduced to help stabilize the proposed model.
Xiaodong Sun (Advisor)
Tunc Aldemir (Committee Member)
Richard Christensen (Committee Member)
Richard Denning (Committee Member)
225 p.
Engineering
two-phase flow simulation; two-fluid model; interfacial area transport equation; interfacial force; well-posedness

Recommended Citations

Citations

  • Wang, X. (2010). Simulations of Two-phase Flows Using Interfacial Area Transport Equation [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1282066341

    APA Style (7th edition)

  • Wang, Xia. Simulations of Two-phase Flows Using Interfacial Area Transport Equation. 2010. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1282066341.

    MLA Style (8th edition)

  • Wang, Xia. "Simulations of Two-phase Flows Using Interfacial Area Transport Equation." Doctoral dissertation, Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1282066341

    Chicago Manual of Style (17th edition)

osu1282066341
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© 2010, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.