Two-fluid modeling of the bubbly/slug flow regime transition
- Oak Ridge National Lab., TN (United States)
- Rensselaer Polytechnic Institute, Troy, NY (United States)
When gas and liquid flow in a vertical duct, the distribution of the phases can assume different configurations called flow regimes. If the particular flow regime present in a given two-phase system is known, the most accurate formulation to analyze the thermal-hydraulic behavior of the system is a two-fluid model. A two-fluid model considers each phase independently, including a set of mass, momentum, and energy equations for each phase, and it represents the phasic interaction by using interfacial transfer terms. The interfacial transfer terms are modeled by using constitutive laws that are flow regime dependent. This is why knowledge of the flow regime is of great importance if one is to model two-phase flow mechanistically. However, the state of the art in the understanding of flow regime transition is quite limited; thus, simplified flow regime maps and/or correlations have been widely used to infer flow regime transition. Unfortunately, these maps are normally not mechanistically based and are known to be inadequate even for steady-state, let alone transient, applications. Nevertheless, if the physics that causes flow regime transition is included in the two-fluid model, the resultant extended two-fluid model should be able to predict flow regime transition without the use of flow regime maps. Indeed, the objective of this work was to develop an extended two-fluid model that is capable of predicting the bubbly/slug flow regime transition.
- OSTI ID:
- 6959435
- Report Number(s):
- CONF-931160-; CODEN: TANSAO
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Vol. 69; Conference: American Nuclear Society (ANS) winter meeting, San Francisco, CA (United States), 14-18 Nov 1993; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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