Abstract
The relationship between void fraction and quality was determined as a function of mass velocity for refrigerant 113 and its vapor in steady-state downward flow. These data were used together with the so-called “dynamic slip” model to determine the product of interfacial drag, C LG , and interfacial area per unit volume, A LG . Visual observations of flow-pattern transitions along with drag disk and void fraction measurements, were made during flow transients. The “dynamic slip” model and the previously calculated values of C LGA LG , were used to determine the appropriate relationship between α and x during the transient. This enables comparison of the transient flow pattern observations with steady-state flow maps. The comparison indicated that the transient data approximately followed the steady-state map but that in most cases the existing flow pattern persists slightly past the steady-state boundary.
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