title: Measuring Newtonian viscosity from the phase of reflected ultrasonic shear wave.
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.
authors.affiliation: Department of Aerospace Engineering, Mississippi State University, MS 39762, USA.
authors.forename: V V
authors.initials: VV
authors.lastname: Shah
authors.forename: K
authors.initials: K
authors.lastname: Balasubramaniam
mesh_terms: D000535:Aluminum; D006108:Graphite; D006838:Hydrocarbons; D008962:Models, Theoretical; D019904:Polymethyl Methacrylate; D012996:Solutions; D014465:Ultrasonics; D014783:Viscosity
chemical_list: D006838:Hydrocarbons; D012996:Solutions; D006108:Graphite; D019904:Polymethyl Methacrylate; D000535:Aluminum