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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.146

ISSN 印刷: 2169-2785
ISSN オンライン: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2014008025
pages 15-40

REVIEW AND MODELING OF TWO-PHASE FRICTIONAL PRESSURE GRADIENT AT MICROGRAVITY CONDITIONS

M. M. Awad
Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt 35516
Yuri S. Muzychka
Department of Mechanical Engineering, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, A1B 3X5, Canada

要約

First, a detailed review of the two-phase frictional pressure gradient at microgravity conditions is presented. Then, a simple method for calculating the two-phase frictional pressure gradient at microgravity conditions using asymptotic analysis is presented. The two-phase frictional pressure gradient is expressed in terms of the asymptotic single-phase frictional pressure gradients for liquid and gas flowing alone. In the present model, the two-phase frictional pressure gradient for x ≅ 0 is nearly identical to the single-phase liquid frictional pressure gradient. Also, the two-phase frictional pressure gradient for x ≅ 1 is nearly identical to the single-phase gas frictional pressure gradient. The proposed model can he transformed into either a two-phase frictional multiplier for liquid flowing alone (Φ2l) or two-phase frictional multiplier for gas flowing alone (Φ2g) as a function of the Lockhart−Martinelli parameter, X. A comparison of the asymptotic model with the experimental data at microgravity conditions is presented, and a robust value of the fitting parameter is chosen as p = 2/7.


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