An improved two-phase flow pattern map is proposed for evaporation in horizontal tubes. The new map was developed based on flow pattern data for five different refrigerants covering a wide range of mass velocities and vapor qualities. The new map is valid for both adiabatic and diabatic (evaporating) flows and accurately identifies about 96 percent of the 702 data points. In addition, the new flow pattern map includes the prediction of the onset of dryout at the top of the tube during evaporation inside horizontal tubes as a function of heat flux and flow parameters.

Issue Section:
Boiling and Condensation
Keywords:
Evaporation, Flow Visualization, Multiphase Flows
Topics:
Boiling, Evaporation, Flow (Dynamics), Two-phase flow, Flow visualization, Heat flux, Multiphase flow, Refrigerants, Vapors
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