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S4 Ciências e Engenharia do Petróleo |
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Titulo:
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MEASUREMENT OF VISCOSITY USING WAVE MODE CONVERSION
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Resumo :
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ABSTRACT. THIS PAPER PRESENTS A NOVEL CELL TO MEASURE THE DYNAMIC VISCOSITY OF LIQUIDS USING ULTRASOUND AND WAVE MODE CONVERSION. THE CELL USES THE COMPLEX REFLECTION COEFFICIENT OF SHEAR WAVES AT A SOLID-LIQUID INTERFACE. THE TRANSMITTED AND REFLECTED WAVES ARE MEASURED BY A LARGE APERTURE PVDF MEMBRANE. THE MAGNITUDE AND PHASE OF THE COEFFICIENT ARE OBTAINED BY NORMALIZING THE SIGNAL FROM THE SOLID-LIQUID INTERFACE WITH RESPECT TO THE ONE FROM THE SOLID-AIR INTERFACE IN FREQUENCY DOMAIN. THE RELATIVE REFLECTION METHOD IS USED FOR SHEAR WAVES. MEASUREMENTS OF THE VISCOSITY OF AUTOMOTIVE OILS WERE MADE IN THE RANGE FROM 1 TO 10 MHZ. THE EXPERIMENTAL RESULTS WERE COMPARED WITH THOSE FROM A ROTATIONAL VISCOMETER.
KEYWORDS: ULTRASOUND, DYNAMIC VISCOSITY, WAVE MODE CONVERSION.
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Autores :
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Adamowski, Júlio Cezar
Buiochi, Flávio
Higuti, Ricardo Tokio
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Trabalho Completo :
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