Non-Newtonian behaviour of yeast suspensions |
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Authors: | El-Temtamy Seham Farahat Laila el-din Azza Nour Gaber Ahmed |
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Institution: | (1) Egyptian Petroleum Research Institute, Nasr City, Egypt;(2) Present address: Chem. Eng. Dep., Cairo University, Guiza, Cairo |
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Abstract: | Summary The rheological properties of yeast (Baker's yeast) suspensions in water and in water-methanol-electrolyte solutions have been investigated using a Fann V.G. concentric cylinder viscometer. The resulted rheograms could be described by the power law model for non-Newtonian fluids with the flow behaviour index n<1 indicating pseudo-plastic behaviour. This flow behaviour index was constant under all operating conditions while the consistancy index k increased exponentially with increasing wet yeast volume fraction. The addition of methanol and electrolytes had a negligible effect on the rheological properties. Changing the pH of the suspension acidic to lowered the apparent viscosities. |
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