Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.2/2083
Título: Vibrating-wire viscometers for liquids at high pressures
Autor: Oliveira, Carla Padrel de
Assael, Marc J.
Papadaki, Maria
Wakeham, William A.
Palavras-chave: High pressure
Vibrating wire
Data: 1992
Citação: Oliveira, Carla Padrel de [et al.] - Vibrating-wire viscometers for liquids at high pressures. "International Journal of Thermophysics". ISSN 0195-928X (Print) 1572-9567 (Online). Vol. 13, Nº 4 (1992), p. 593-615
Resumo: The design and operation of two independent vibrating-wire viscometers are described. The instruments are intended for operation in the liquid phase at pressures up to 300 MPa and have been designed specifically for this purpose using the detailed theory of the device. Extensive evidence is adduced to demonstrate that the operation of the viscometers is consistent with the theory. Although the instruments attain a precision in viscosity measurements of __+1% when used in an absolute mode the accuracy that can be achieved is no better than __+3%. However, if the instrument is calibrated for two welldefined instrumental parameters, the uncertainty in the reported viscosity is improved to _+0.5%. The results of measurements of the viscosity of normal heptane in the temperature range 303 to 348 K at pressures up to 250 MPa made with one of the viscometers are reported. The results are shown to be totally consistent with measurements reported earlier using the instrument designed for lower pressures.
Peer review: yes
URI: http://hdl.handle.net/10400.2/2083
ISSN: 0195-928X (Print)
1572-9567 (Online)
Aparece nas colecções:Ciências e Tecnologia - Artigos em revistas internacionais / Papers in international journals

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