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Thermophysical properties of CO2-lubricant mixtures and their effect on 2-phase flow in small channels (less than 1 mm).

Author(s) : SEETON C. J., HRNJAK P.

Summary

This paper develops an equation-based approach for the VLE and VLLE properties of CO2-lubricant mixtures. Since carbon dioxide is only partially soluble in many of the working lubricants now available, knowing the separation temperature (miscibility) and phase inversion temperature is of importance in the design of heat exchangers, compressors and auxiliary equipment. Also, of special interest to compressor design engineers is the knowledge of the CO2-lubricant liquid viscosity; and for microchannel heat exchanger designers, the interfacial surface tension can be vitally important. The second part of the part investigates how these thermophysical properties of CO2-lubricant mixtures affect the two-phase flow patterns in tubes less than 1 mm. This will focus on how the mixture vapour to liquid density and viscosity ratios and the CO2-lubricant mixture surface tension interact in the formation of flow patterns in tubes less than 1 mm in diameter.

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Details

  • Original title: Thermophysical properties of CO2-lubricant mixtures and their effect on 2-phase flow in small channels (less than 1 mm).
  • Record ID : 2007-1933
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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