Abstract
A liquid balancing column and differential magnetic reluctance pressure transducers were used to simultaneously measure two-phase frictional pressure drop and vapor volume fraction in vertical boiling and adiabatic flow of refrigerant R11. The vapor quality is obtained through a heat balance. The experimental setup, operating procedure, data acquisition system, data analysis, and error estimation are described. Good accuracy is obtained. Results for vertical upflow and downflow under both boiling and adiabatic conditions in a 19.1 mm tube, 1.48 m long, with mass fluxes of 256 and 401 kg/(m 2·s), heat fluxes of 4.0 and 11.4 kW/m 2, and vapor volume fraction ranging from approximately 0.5 to 1.0 are given. All values of two-phase multipliers evaluated from measured frictional pressure drop data in vertical upflow fall in a range bounded by the predictions of the Chisholm correlation and the homogeneous model. For vertical downflow, the frictional pressure drop exhibits an anomalous behavior similar to that reported by a previous investigator. All vapor volume fraction data can be well correlated by a scheme based on the Zuber-Findlay drift flux model.
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