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ISSN Druckformat: 2169-2785
ISSN Online: 2167-857X
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REVIEW AND MODELING OF TWO-PHASE FRICTIONAL PRESSURE GRADIENT AT MICROGRAVITY CONDITIONS
ABSTRAKT
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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