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Estimation of Steady-State Steam Void-Fraction by Means of the Principle of Minimum Entropy Production
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1964
Year
Steam DistributionEngineeringFluid PropertiesEntropyFluid MechanicsMechanical EngineeringSteady-state Steam Void-fractionComplete EntrainmentEntropy ProductionTransport PhenomenaGas-liquid FlowThermodynamicsHeat TransferMultiphase FlowLiquid EntrainmentMinimum Entropy ProductionTwo-phase Flow
The study analyzes steam‑void fraction in two‑phase flow by applying the principle of minimum entropy production, modeling the flow as a steady‑state process and assessing the impacts of liquid entrainment and wall friction. It finds that the slip‑ratio in an idealized two‑phase flow with zero wall friction and entrainment equals (ρf/ρg)1/3, and experimental data are bracketed between this value and the complete entrainment case (slip ratio = 1).
An analysis of steam-void fraction in two-phase flow is carried out, utilizing the principle that in a steady-state thermodynamic process the rate of entropy production is minimum. The two-phase flow is idealized in the analysis to be a truly steady-state process. The effects of liquid entrainment and wall friction on the void fraction and slip ratio are evaluated. It is found that the slip-ratio in an idealized two-phase flow with zero wall friction and zero entrainment equals (ρf/ρg)1/3. Data from a number of experiments are found to be bracketed between this result and the result obtained by assuming complete entrainment (slip ratio = 1).