### Abstract

This paper presents the general strategy for modeling the source and sink terms in the two-group interfacial area transport equation. The two-group transport equation is applicable in bubbly, cap bubbly, slug, and churn-turbulent flow regimes to predict the change of the interfacial area concentration. This dynamic approach has an advantage of flow regime-independence over the conventional empirical correlation approach for the interfacial area concentration in the applications with the two-fluid model. 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 of 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. Based upon a detailed literature review of the research on the bubble interactions, five major bubble interaction mechanisms are identified for the gas-liquid two-phase flow of interest. A systematic integral approach, in which the significant variations of bubble volume and shape are accounted for, is suggested for the modeling of two-group bubble interactions. To obtain analytical forms for the various bubble interactions, a simplification is made for the bubble number density distribution function.

Original language | English (US) |
---|---|

Pages (from-to) | 1309-1331 |

Number of pages | 23 |

Journal | Annals of Nuclear Energy |

Volume | 30 |

Issue number | 13 |

DOIs | |

State | Published - Sep 1 2003 |

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### All Science Journal Classification (ASJC) codes

- Nuclear Energy and Engineering

### Cite this

*Annals of Nuclear Energy*,

*30*(13), 1309-1331. https://doi.org/10.1016/S0306-4549(03)00075-6

}

*Annals of Nuclear Energy*, vol. 30, no. 13, pp. 1309-1331. https://doi.org/10.1016/S0306-4549(03)00075-6

**Modeling strategy of the source and sink terms in the two-group interfacial area transport equation.** / Ishii, Mamoru; Sun, Xiaodong; Kim, Seungjin.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Modeling strategy of the source and sink terms in the two-group interfacial area transport equation

AU - Ishii, Mamoru

AU - Sun, Xiaodong

AU - Kim, Seungjin

PY - 2003/9/1

Y1 - 2003/9/1

N2 - This paper presents the general strategy for modeling the source and sink terms in the two-group interfacial area transport equation. The two-group transport equation is applicable in bubbly, cap bubbly, slug, and churn-turbulent flow regimes to predict the change of the interfacial area concentration. This dynamic approach has an advantage of flow regime-independence over the conventional empirical correlation approach for the interfacial area concentration in the applications with the two-fluid model. 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 of 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. Based upon a detailed literature review of the research on the bubble interactions, five major bubble interaction mechanisms are identified for the gas-liquid two-phase flow of interest. A systematic integral approach, in which the significant variations of bubble volume and shape are accounted for, is suggested for the modeling of two-group bubble interactions. To obtain analytical forms for the various bubble interactions, a simplification is made for the bubble number density distribution function.

AB - This paper presents the general strategy for modeling the source and sink terms in the two-group interfacial area transport equation. The two-group transport equation is applicable in bubbly, cap bubbly, slug, and churn-turbulent flow regimes to predict the change of the interfacial area concentration. This dynamic approach has an advantage of flow regime-independence over the conventional empirical correlation approach for the interfacial area concentration in the applications with the two-fluid model. 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 of 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. Based upon a detailed literature review of the research on the bubble interactions, five major bubble interaction mechanisms are identified for the gas-liquid two-phase flow of interest. A systematic integral approach, in which the significant variations of bubble volume and shape are accounted for, is suggested for the modeling of two-group bubble interactions. To obtain analytical forms for the various bubble interactions, a simplification is made for the bubble number density distribution function.

UR - http://www.scopus.com/inward/record.url?scp=0038237516&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038237516&partnerID=8YFLogxK

U2 - 10.1016/S0306-4549(03)00075-6

DO - 10.1016/S0306-4549(03)00075-6

M3 - Article

AN - SCOPUS:0038237516

VL - 30

SP - 1309

EP - 1331

JO - Annals of Nuclear Energy

JF - Annals of Nuclear Energy

SN - 0306-4549

IS - 13

ER -