Abstract
Local heat transfer coefficients were experimentally investigated, with special attention paid to their values along a tube perimeter, for the flow of Refrigerant-22 with 0 to 6 percent by mass of oil contained inside horizontal evaporator tubes. The addition of the oil to the refrigerant produced an increase in the heat transfer coefficient over a wide range of quality at low mass velocities and in the low quality region at high mass velocities where the tube perimeter was not wholly wetted. This increase was attributed to an intensive foaming action which promoted tube wetting. The heat transfer coefficient at high mass velocities, where an annular liquid film was formed over the whole tube perimeter, decreased with increasing quality due to the formation of the oil-rich liquid film, which gradually expanded from the top toward the bottom of the tube.
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