Non-newtonian modeling of polarization phenomena during fruit juice concentration by membranes

Non-newtonian modeling of polarization phenomena during fruit juice concentration by membranes

Autori: S. Curcio, V. Calabrò, G. Iorio, B. de Cindio
Presentato al: Southern Europe Conference on Rheology
Anno: 1999
Volume: 2 - Issue: Unico
Casa Editrice: SIR-Cuen Napoli
Lingua: English

Abstract
A theoretical study of transport phenomena in membrane processes is presented. The proposed solution is based on the application of boundary layer theory coupled with the well-known osmotic pressure model. Aim of the study is the individuation of the operating conditions that, in laminar regime, limits concentration polarization phenomena occurring during macromolecular solutions concentration by means of membranes. Concentration polarization can be considered a membrane reversible fouling because its effects can be reduced decreasing the trans-membrane pressure (driving force) or feeding to the system a less concentrated solution. The attention has been focused on orange juice solutions; these may be considered, in a wide shear rate range, non-newtonian fluids modeled by a power-low equation. The dependence of apparent viscosity and, therefore, of diffusion coefficient upon concentration has been taken into account, too.

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XIX Italian Society of Rheology Conference

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The Italian Society of Rheology (SIR) organizes every two years the Italian Rheology Conference, which is the meeting point of the National and International rheological community to promote knowledge and discuss research in the field of rheology. The Conference consists of keynote lectures, oral communications and posters on topics related to all the thematic areas of rheology. The XIX edition will be held in the conference rooms of Plesso Belmeloro, in the city centre of Bologna, in June 16th-19th, 2026. Book your accommodation in Bologna well in advance, the city is a famous tourist destination and has limited availability of accommodations!

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