On the pressure dependence of the viscosity of aqueous sugar solutions |
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Authors: | Email author" target="_blank">Petra?F?rstEmail author Franz?Werner Antonio?Delgado |
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Institution: | 1.Lehrstuhl für Fluidmechanik und Prozessautomation, Weihenstephaner Steig 23, D-85354 Freising,Germany |
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Abstract: | New experimental data for the pressure dependence of the viscosity of aqueous solutions of different sugars are presented. Measurements were carried out with a gravity driven high pressure viscometer with a maximum pressure of 700 MPa. The influence of both concentration and temperature on the pressure dependence of the viscosity is considered. Next to the data, a viscosity model based on a suspension model is introduced and it is shown that it is able to predict the viscosity for sugar solutions in a broad parameter range, including pressure. It is demonstrated that the relative viscosity for varying sugar mass fraction at constant pressure coincides with the pressure-dependent relative viscosity for a fixed sugar mass fraction, suggesting that there are no structural changes occurring under pressure. A brief interpretation of the viscosity model is given. |
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