Abstract
Under the influence of a stationary ultrasonic wave field, fluid-suspended fibres shorter than one-fourth of the acoustic wavelength migrate toward stable equilibrium positions and reorientate to stable equilibrium angular positions. Using optical monitoring of the suspension, acoustic layering and reorientation can be studied as a function of fibre dimensions. To explain some experimental results obtained with a dilute water suspension of paper-making fibres, a theoretical investigation of fibre motion and light scattering behaviour during ultrasonic excitation is required. This paper reports on some aspects of the mathematical model being developed. It is shown that acoustic layering and reorientation are dominant effects for long and short fibres, respectively.
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