Measuring Newtonian viscosity from the phase of reflected ultrasonic shear wave |
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Authors: | Shah V V Balasubramaniam K |
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Institution: | Department of Aerospace Engineering, Mississippi State University, MS 39762, USA. |
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Abstract: | In this paper, an acoustic shear impedance model is employed to obtain a relation between the viscosity of a Newtonian fluid and phase characteristics of ultrasonic shear wave reflection from a solid-fluid interface. The phase and magnitude of the reflection coefficient can be decoupled in this model. The decoupling allows an independent relation between the acoustic shear impedance (viscosity-density product) and phase of the reflection coefficient. The model was experimentally verified for different fluid-solid combinations. Comparison of the results with the commonly used absolute reflection coefficient method demonstrates that phase measurement provides improved measurements. |
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