A void fraction model for annular flow in horizontal tubes
An important feature of detailed system simulation models for unitary air conditioners is the calculation of charge inventory. Void fraction determination in the two-phase regions of the heat exchangers is the primary challenge associated with charge inventory calculations. Annular flow is one of th...
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| Veröffentlicht in: | International journal of heat and mass transfer 2003-10, Vol.46 (21), p.4051-4057 |
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| container_title | International journal of heat and mass transfer |
| container_volume | 46 |
| creator | Harms, Todd M. Li, Daqing Groll, Eckhard A. Braun, James E. |
| description | An important feature of detailed system simulation models for unitary air conditioners is the calculation of charge inventory. Void fraction determination in the two-phase regions of the heat exchangers is the primary challenge associated with charge inventory calculations. Annular flow is one of the predominant flow regimes encountered in horizontal heat exchangers. Analytical annular flow models typically fail to accurately represent void fraction. Thus, many of the available void fraction models are empirically based. To improve the prediction capabilities of void fraction models, a mechanistic void fraction model has been developed for annular flow in horizontal tubes. The present model considers the effect of momentum eddy diffusivity damping at the liquid–vapor interface. Two approaches are presented for determining the wall shear stress. The modeling results are compared to predictions from various void fraction models found in the literature. The present model is found to work well at moderate mass fluxes. |
| doi_str_mv | 10.1016/S0017-9310(03)00228-X |
| format | Article |
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Void fraction determination in the two-phase regions of the heat exchangers is the primary challenge associated with charge inventory calculations. Annular flow is one of the predominant flow regimes encountered in horizontal heat exchangers. Analytical annular flow models typically fail to accurately represent void fraction. Thus, many of the available void fraction models are empirically based. To improve the prediction capabilities of void fraction models, a mechanistic void fraction model has been developed for annular flow in horizontal tubes. The present model considers the effect of momentum eddy diffusivity damping at the liquid–vapor interface. Two approaches are presented for determining the wall shear stress. The modeling results are compared to predictions from various void fraction models found in the literature. The present model is found to work well at moderate mass fluxes.</description><identifier>ISSN: 0017-9310</identifier><identifier>EISSN: 1879-2189</identifier><identifier>DOI: 10.1016/S0017-9310(03)00228-X</identifier><identifier>CODEN: IJHMAK</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Air conditioning. Ventilation ; Applied sciences ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; Fluid dynamics ; Fundamental areas of phenomenology (including applications) ; General. 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Void fraction determination in the two-phase regions of the heat exchangers is the primary challenge associated with charge inventory calculations. Annular flow is one of the predominant flow regimes encountered in horizontal heat exchangers. Analytical annular flow models typically fail to accurately represent void fraction. Thus, many of the available void fraction models are empirically based. To improve the prediction capabilities of void fraction models, a mechanistic void fraction model has been developed for annular flow in horizontal tubes. The present model considers the effect of momentum eddy diffusivity damping at the liquid–vapor interface. Two approaches are presented for determining the wall shear stress. The modeling results are compared to predictions from various void fraction models found in the literature. The present model is found to work well at moderate mass fluxes.</description><subject>Air conditioning. Ventilation</subject><subject>Applied sciences</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Fluid dynamics</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>General. 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| ispartof | International journal of heat and mass transfer, 2003-10, Vol.46 (21), p.4051-4057 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Air conditioning. Ventilation Applied sciences Energy Energy. Thermal use of fuels Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) General. Properties of wet air Heating, air conditioning and ventilation Multiphase and particle-laden flows Nonhomogeneous flows Physics |
| title | A void fraction model for annular flow in horizontal tubes |
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