Abstract
The effects of lubricating oil on the flow boiling heat transfer of the low global warming potential (GWP) refrigerant 2,3,3,3-tetrafluoropropene (HFO-1234yf) in small-diameter tubes with inner diameters of 2 and 4 mm were experimentally investigated. Measurements of the local heat transfer coefficient and observations of the flow pattern were conducted to clarify the change in heat transfer performance and flow pattern under different vapor quality, mass flux, heat flux, and oil mass fraction conditions. The results showed that with an increasing oil mass fraction, the local heat transfer coefficient increased at lower vapor quality because of intensified foaming phenomena. However, the heat transfer coefficient decreased monotonically with oil mass fraction in the high-quality vapor region. Foaming phenomena were seen at different mass and heat fluxes during the visual observations.
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