Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.2/2040
Título: Viscosity measurements of compressed liquid refrigerant blend R-507A, using a vibrating-wire technique
Autor: Avelino, Helena M. N. T.
Fareleira, João M. N. A.
Oliveira, Carla Padrel de
Palavras-chave: Viscosity measurements
Vibrating-wire viscometer
Refrigerant blend R-507A
Data: 2008
Editora: American Chemical Society
Citação: Avelino, Helena M. N. T.; Fareleira, João M. N. A.; Oliveira, Carla Padrel de - Viscosity measurements of compressed liquid refrigerant blend R-507A, using a vibrating-wire technique. "Journal of Chemical & Engineering Data". ISSN 0021-9568 (Print) 1520-5134 (Online). Vol. 53, Nº 1 (2008), p. 53-56
Resumo: The refrigerant blend R-507A (50 wt % HFC-143a, 50 wt % HFC-125) is an azeotropic mixture of hydrofluorocarbon refrigerants, 1,1,1-trifluoroethane (HFC-143a) and pentafluoroethane (HFC-125). The paper reports viscosity measurements, performed with a vibrating-wire viscometer, of the refrigerant blend R-507A,at five temperatures in the range (253 to 293) K. The measurements were carried out at pressures from slightly above saturation up to 10 MPa, except for the isotherms at 253.26 K where the maximum pressure was 7.52 MPa and at 263.23 K where the maximum pressure was 7.09 MPa. The overall uncertainty of these measurements is estimated to be ( 1.0 %. The data obtained were correlated by means of a modified hard-sphere based correlation technique. The root-mean-square deviation, rmsd, of the experimental results from the correlation equations is 0.23 %, and their bias is not significant. This correlation method has also been used to interpolate and extrapolate the present results to enable comparisons with measurements performed by other authors of the viscosity of liquid R-507A at different temperatures and pressures.
Peer review: yes
URI: http://hdl.handle.net/10400.2/2040
ISSN: 0021-9568 (Print)
1520-5134 (Online)
Versão do Editor: DOI: 10.1021/je700345b
Aparece nas colecções:Ciências e Tecnologia - Artigos em revistas internacionais / Papers in international journals

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