Prediction of the settling or rising velocity of particles or bubbles finds application in many processes of food industry (gravitational or centrifugal settling, flottation, ecc.) In this paper we concern with the simple case of terminal velocity of a single rigid sphere in unbounded volume of the fluid phase (very dilute food suspension). On the basis of asymptotic analysis, Nguyen et Al. (1997) showed that the terminal velocity of a rigid sphere can be directly predicted on the basis of the physical properties of the solid particle and fluid medium via Archimede number, by a single formula valid for Reynolds number up to 1000. By a dimensionless number analysis we obtained, in this paper, an improved formula for the terminal velocity. We showed that our equation is careful and simple in the same way, but is valid for Reynolds number up to 10000.

ANALISI DIMENSIONALE DELLA SEPARAZIONE DI PARTICELLE SFERICHE DA SOSPENSIONI ALIMENTARI DILUITE

FRISO, DARIO
2006

Abstract

Prediction of the settling or rising velocity of particles or bubbles finds application in many processes of food industry (gravitational or centrifugal settling, flottation, ecc.) In this paper we concern with the simple case of terminal velocity of a single rigid sphere in unbounded volume of the fluid phase (very dilute food suspension). On the basis of asymptotic analysis, Nguyen et Al. (1997) showed that the terminal velocity of a rigid sphere can be directly predicted on the basis of the physical properties of the solid particle and fluid medium via Archimede number, by a single formula valid for Reynolds number up to 1000. By a dimensionless number analysis we obtained, in this paper, an improved formula for the terminal velocity. We showed that our equation is careful and simple in the same way, but is valid for Reynolds number up to 10000.
2006
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/1562209
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