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  • 1
    Electronic Resource
    Electronic Resource
    Surface Tension of HFC Refrigerant Mixtures (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 119-127 
    Details
    ISSN: 1572-9567
    Keywords: differential capillary-rise method ; mixtures ; R-410A ; R-410B ; R-407C ; R-404A ; R-507 ; refrigerants ; surface tension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface tension of refrigerant mixtures, i.e., R-410A (50 mass% R-32/50 mass% R-125), R-410B (45 mass% R-32/55 mass% R-125), R-407C (23 mass% R-32/25 mass% R-125/52 mass% R-134a), R-404A (44 mass% R-125/52 mass% R-143a/4 mass% R-134a), and R-507 (50 mass% R-125/50 mass% R-143a), has been measured and correlated in the present study. Although the first three mixtures are very important as promising replacements for R-22 in air-conditioners and heat-pumps and the last two are promising replacements for R-502, surface tension data for these mixtures were not previously available. The measurements were conducted under conditions of coexistence of the sample liquid and its saturated vapor in equilibrium. The differential capillary rise method (DCRM) was used, with two glass capillaries with inner radii of 0.3034±0.0002 and 0.5717±0.0002 mm. The temperature range covered was from 273 to 323 K, and the uncertainty of measurements for surface tensions and temperatures is estimated to be at most ±0.2 mN·m−1 and ±20 mK, respectively. A mixing rule was selected for representing the temperature dependence of the resultant data. These data were successfully represented by a mixing rule using mass fraction based on the van der Waals correlation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021482231102
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental surface tensions for HFC-32, HCFC-124, HFC-125, HCFC-141b, HCFC-142b, and HFC-152a (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 791-800 
    Details
    ISSN: 1572-9567
    Keywords: differential capillary-rise method ; HFC-32 ; HCFC-124 ; HFC-125 ; HCFC-141b ; HCFC-1426 ; HFC-152a ; refrigerants ; surface tension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface tension of six alternative refrigerants, i.e., HFC-32 (CH, F, ). HCFC-124 (CHClFCF,), HFC-125 (CHF2CF3). HCFC-14lb ICH,CCI,F). HCFC-142b (CH3CCIF2), and HFC-152a (CH3CHF2), has been measured in the present study. The measurements were conducted under equilibrium conditions between the liquid and its saturated vapor. The differential capillary-rise method (DORM) used two glass capillaries, with inner radii of 0.3034 ± 0.0002 and 0.5717 ±0.0002 mm, respectively. Temperatures in the range from 270 to 340 K were considered. The accuracy of surface tension measurements is estimated to be within ±0.2 mN · m−1. The temperatures are accurate to within ±20 mK. The temperature dependence of the resultant data were successfully represented by van der Waals' correlations to within ±(1.1 mN m−1 for each substance. Available surface tension data are compared with the present data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438864
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    Paper (German National Licenses)
    Fulltext
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