VELOCITY PROFILES OF FLUID/PARTICULATE MIXTURES IN PIPE FLOW USING MRI

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Abstract
Magnetic resonance imaging (MRI) techniques have been utilized to experimentally measure velocity profiles and apparent Theological properties of fluid/paniculate mixtures as functions of flow rate, particle loading, and particle size. The experimental velocity profiles were described by apower law model for these systems. A 3% aqueous sodium alginic acid solution was used to form two particle sizes of 2.5 mm and 5.0mm in diameter. The spheres were suspended in a 0.5% carboxymethyl cellulose solution at loadings ofO, 10, 20, and 30% by weight. The average fluid velocity ranged from 2–35 cm/s. The flow behavior index decreased as flow rate, particle loading or particles size increase. Cumulative residence time curves were evaluated based on this modeling procedure. Results of this research have direct application to aseptic processing of fluid/particulate mixtures.

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