Summary
A family of sensors which measure the complex coefficient of dynamic viscosity (η *) is discussed. Using a first order approximation to a general viscoelastic fluid, it is shown how these instruments determineη * for a general linear viscoelastic fluid. The measurement technique employed relates the linear viscous damping and resonant frequency of these instruments in the presence and absence of fluid toη *. This analysis also provides the inherent limitations of the sensors.
Übersicht
Eine Familie von Sensoren wird diskutiert, welche den komplexen Koeffizienten (η *) der Viskosität misst. Mit Hilfe einer Approximation erster Ordnung eines allgemeines viskoelastisches Fluid wird gezeigt, wie diese Instrumente verwendet werden können, umη * für ein allgemeines linear viskoelastisches Fluid zu bestimmen. Die Messtechnik verwendet die Tatsache, daß Resonanzfrequenz und linearviskose Dämpfung der Sensoren abhängig sind vom Fluid, welches sich in der direkten Umgebung des Sensors befindet. Die Analyse, die hier verwendet wird, zeigt Möglichkeiten und Grenzen der Sensoren auf.
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Dual, J., O'Reilly, O.M. Resonant torsional vibrations: an application to dynamic viscometry. Arch. Appl. Mech. 63, 437–451 (1993). https://doi.org/10.1007/BF00788042
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DOI: https://doi.org/10.1007/BF00788042