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Influences of miscible and immiscible oils on flow characteristics through capillary tube. Part I: experimental study.

Author(s) : FUKUTA M., YANAGISAWA T., ARAI T., et al.

Type of article: Article, IJR article

Summary

A capillary tube is widely used as an expansion device for small refrigeration cycles. In a practical refrigeration cycle, a certain amount of refrigeration oil is discharged from a compressor and refrigerant/oil mixture flows through the capillary tube. This study experimentally investigated the influence of mixing of the refrigeration oil with the refrigerant on the flow through the capillary tube. The experiments were carried out with not only a miscible combination of refrigerant and oil but also an immiscible combination. In both cases, the mass flow rate through the capillary tube and temperature and pressure distributions along the tube were measured under several subcooling and oil concentration conditions. In the case of the miscible combination, the refrigerant's mass flow rate decreased with increasing oil concentration; this was because the viscosity of the liquid phase increased following mixing with viscous oil. Even in the case of the immiscible combination, the oil droplet is so small that it mixes homogeneously in the liquid phase in the capillary tube and the refrigerant mass flow rate decreases following mixing with the immiscible oil. There is no significant influence of the oil concentration on underpressure, which constitutes the pressure difference between the saturation pressure and the flash inception pressure, in both miscible and immiscible combinations.

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Pages: 823-829

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Details

  • Original title: Influences of miscible and immiscible oils on flow characteristics through capillary tube. Part I: experimental study.
  • Record ID : 2004-1569
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 7
  • Publication date: 2003/11

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