Abstract
The relationship between interfacial shear and the flow patterns observed in the vertical upflow and downflow of vapor-liquid mixtures has been explored. It was found that the flow pattern transitions in adiabatic flow could be related to the interfacial shear. New observations of the two-phase flow behavior of refrigerant 113 in heated lines indicated that the void fraction vs quality curves and the location of some flow pattern transitions differ under adiabatic and diabatic conditions. The shifts seen in the flow pattern transitions are consistent with the changed interfacial shear derived from the revised void fraction vs quality curves.
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