Abstract
An experimental study has been made of boiling heat transfer on a fine horizontal wire in refrigerant-oil mixtures with a wide range of pressure up to 24 bar. The effect of oil on boiling heat transfer becomes more marked in a high heat flux region. Especially, in the case of R 115 with a small solubility for oil, an anomalous phenomenon appears that the heat transfer coefficient contrarily decreases with increasing the heat flux beyond a certain heat flux which depends on the system pressure as well as the oil is concentration although it is below the critical heat flux. In the R 11 oil mixtures, the effect oil is contrary depending on the system pressure, that is, the oil enhances the heat transfer at the oil concentration below 2 or 3 wt % for p=2 bar, but deteriorates it over the experimental range of the oil concentration for p=1 and 5 bar. The intensity of the effect of oil on the boiling heat transfer depends on the type of oil.
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