A energia, o ambiente e a sociedade: que futuro? A dependência energética da nossa sociedade tem vindo a aumentar cada vez mais em nome do desenvolvimento tecnológico e do bem-estar social. Contudo o preço a pagar é cada vez maior devido à falta de atenção para que se mantenha uma relação com o ambiente que garanta a sua sustentabilidade. Muitos fenómenos naturais estarão associados a esta relação fraca o que c...
In industrial practice, there is a demand for a reference standard for viscosity that is established for a readily available fluid to simplify the calibration of industrial viscometers for moderately high viscosities [(50 to 125) mPa · s]. Diisodecyl phthalate (DIDP) has been suggested as that reference fluid, and a number of studies of its properties have been carried out in several laboratories throughout the...
The present article describes a novel vibrating-wire viscometer that has been shown to be able to measure viscosities up to 135 mPaâs, after calibration against water at 20 °C, to provide direct traceability to the primary reference for viscosity. For the purpose of validating the instrument, measurements of the viscosity of some selected fluids, including standard reference liquids with viscosity on the order ...
A recently developed dual vibrating-wire technique has been used to perform viscosity measurements of liquid toluene in the temperature range 213 K ≤ T ≤ 298 K, and at pressures up to approximately 20 MPa. The results were obtained by operating the vibrating-wire sensor in both forced and free decay modes. The estimated precision of the viscosity measurements, in either mode of operation, is ±0.5%, for temperat...
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