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INFLUENCE OF OIL ON REFRIGERANT EVAPORATOR PERFORMANCE. 3. VOID FRACTION AND FLOW REGIME IN THE HORIZONTAL TUBE.

[In Japanese. / En japonais.]

Author(s) : KIM J. S.

Type of article: Article

Summary

AN EXPERIMENT WAS PERFORMED USING A TRANSPARENT TUBE WITH AN INTERNAL DIAMETER OF 20 MILLIMETERS AND A TOTAL LENGTH OF 2,600 MILLIMETERS. OIL-MASS CONCENTRATION WAS CONTROLLED INITIALLY AND CIRCULATED INTO THE SYSTEM. THE VOID FRACTION AT THE MAIN TEST SECTION WAS MEASURED BY DIRECT VOLUME MEASUREMENT. SINCE THE EFFECT OF OIL ON THE TRANSITION OF THE TWO-PHASE FLOW PATTERN IS EMPHASIZED AT LOW-FLOW RATES, THE TESTS WERE DONE AT RELATIVELY LOW MASS VELOCITY, 50 AND 100 KG/M2. SEC. ; 5 DIFFERENT OIL CONCENTRATIONS WERE USED. THE EVAPORATION PRESSURE WAS KEPT AT 105 KILOPASCALS. IN GENERAL, WHEN CONTAMINATION BY THE LUBRICATION OIL OCCURRED, THE VOID FRACTION WAS DECREASINGDUE TO THE CHANGE OF VISCOSITY AND SURFACE TENSION AND THE OCCURENCE OF FOAMING. TO CORRELATE THE VOID FRACTION AS A FUNCTION OF QUALITY, ZIVI'S EXPRESSION WAS MODIFIED TO INCLUDE THE EFFECT OF OIL CONCENTRATION. THE AGREEMENT BETWEEN THE DATA AND THIS PROPOSED CORRELATION WAS FAVOURABLE.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1991-0578
  • Languages: Japanese
  • Source: Trans. JAR - vol. 6 - n. 1
  • Publication date: 1989
  • Document available for consultation in the library of the IIR headquarters only.

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