Fröba AP, Will S, Leipertz A (2000)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2000
Publisher: Springer Verlag (Germany)
Book Volume: 21
Pages Range: 1225-1253
Light scattering by thermally excited capillary waves on liquid surfaces or interfaces can be used For the investigation of viscoelastic properties of fluids. In this work, we carried nut the simultaneous determination of the surface tension and the liquid kinematic viscosity of some alternative refrigerants by surface light scattering (SLS) on a gas-liquid interface. The experiments are based on a hetero dyne detection scheme and signal analysis by photon correlation spectroscopy (PCS). R23 (trifluoromethane), R32 (difluoromethane), R125 (pentafluoroethane). R143a (1,1,1-trifluoroethane), R134a (1,1,1,2-tetrafluoroethane); R152a (1,1-difluoroethane), and R123 (2,2-dichloro-1,1,1-trifluoroethane) were investigated under saturation conditions over a wide temperature range, from 233 K up to the critical point. It is estimated that the uncertainty of the present sur-Face tension data for the whole temperature range is less than +/-0.2 mN(.)m(-1). For temperatures up to about 0.95T(c). the kinematic viscosity of the liquid phase could be obtained with an absolute accuracy of better than 2%. For the highest temperatures studied in this work, measurements for the kinematic viscosity exhibit a maximum uncertainty of about +/-4%. Viscosity and surface tension data are represented by a. polynomial function of temperature and by a van der Waals-type sui face tension equation, respectively. The results are discussed in detail with comparison to literature data.
APA:
Fröba, A.P., Will, S., & Leipertz, A. (2000). Saturated liquid viscosity and surface tension of alternative refrigerants. International Journal of Thermophysics, 21, 1225-1253.
MLA:
Fröba, Andreas Paul, Stefan Will, and Alfred Leipertz. "Saturated liquid viscosity and surface tension of alternative refrigerants." International Journal of Thermophysics 21 (2000): 1225-1253.
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