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Updated: Aug 27, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
An experimental validation of a nonlinear acoustic resistance model for an acoustically compact area contraction with
Luke H Humphreys1, Daniel C Stubbs1, David E Scarborough1
1Aerospace Engineering Department, Auburn University, Auburn, Alabama 36849, USA lukeh@auburn.edu, dcs0008@auburn.edu, des0018@auburn.edu.
Abstract:
In a previously published paper, a model for the nonlinear acoustic response of an area contraction including bias flow was presented. The model's prediction for the zero-driving resistance grew progressively worse as the steady-flow Mach number increased. This trend suggests that the forward loss coefficients should depend on the steady Mach number. This letter provides an empirical fitting of this Mach number dependence, along with additional validation data for the model. These additional validation data corroborate the model's prediction that the nonlinear impedance is frequency independent. This letter additionally provides an experimental methodology for determining the characteristic length with sample results.
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