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Nucleate boiling of refrigerant-oil mixtures: bubble equilibrium and oil enrichment at the interface of a growing vapour bubble.

Author(s) : MITROVIC J.

Type of article: Article

Summary

On the assumption of ideal mixture behaviour and a non-volatile oil, an expression is derived that connects the temperature, the oil concentration and the size of the bubble in equilibrium with the mixture. Using this expression, it is shown that oil, added to a refrigerant, can facilitate the bubble formation and improve the heat transfer. For this to occur, the oil must contain some surface active components. When oil diffusion in the liquid occurs, a minimum driving temperature difference is needed for the film to establish. At a temperature difference above this minimum value, the oil film enveloping the bubble influences its growth kinetics. The film acts as "an interphase" that must be passed through by refrigerant molecules to evaporate.

Details

  • Original title: Nucleate boiling of refrigerant-oil mixtures: bubble equilibrium and oil enrichment at the interface of a growing vapour bubble.
  • Record ID : 1999-3406
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 41 - n. 22
  • Publication date: 1998/11

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