Share

GAS-LIQUID FLOW PATTERNS IN REFRIGERANT-OIL MIXTURES.

Author(s) : MANWELL S. P., BERGLES A. E.

Summary

THE REFRIGERANT WAS R12 AND THE OIL WAS A 300 SUS NAPHTHENIC MINERAL OIL. EXPERIMENTS WITH APPROXIMATELY ADIABATIC TEST SECTION CONDITIONS WERE CONDUCTED FOR A MASS FLUX RANGE OF 45 TO 430 KG/M2.S AT 0.31 MEGAPASCAL FOR 0, 2, 5, AND 10 % OIL CONCENTRATIONS. FOAMING ASSOCIATED WITH REFRIGERANT-OIL MIXTURES IN SMOOTH TUBES WASHES THE SIDE WALLS OF THE TUBE WITH ROLL WAVES, BUT FOAM WAS NOT OBSERVED IN THE CORE OF THE TUBE. FOR PURE R12 FLOWS, THE MICRO-FIN SURFACE PROMOTED THIN FLOWING FILMS ON THE SIDE ANDUPPER WALLS, WHICH REPRESENTS A SIGNIFICANT IMPROVEMENT IN SURFACE WETTING CHARACTERISTICS OVER THE SMOOTH TUBE. THE EXPERIMENTS HAVE SHOWN THAT BOTH OIL AND MICRO-FIN EFFECTS CAN IMPROVE SURFACE WETTIGHACRSS. BECAUSE SURFACE WETTING IS AN IMPORTANT FACTOR IN DETERMINING THE HEAT TRANSFER COEFFICIENT FOR TWO-PHASE FLOW, THE RESULTS ALSO CONTRIBUTE TO THE UNDERSTANDING OF HEAT TRANSFER EFFECTS DUE TO REFRIGERANT-OIL MIXTURES AND MICRO-FIN SURFACES.

Details

  • Original title: GAS-LIQUID FLOW PATTERNS IN REFRIGERANT-OIL MIXTURES.
  • Record ID : 1992-0524
  • Languages: English
  • Publication date: 1990
  • Source: Source: ASHRAE Trans.
    vol. 96; n. 2; 456-464; 15 fig.; 18 ref.
  • Document available for consultation in the library of the IIR headquarters only.

Indexing