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1 International Journal of Applied Mechanics and Engineering

1 2005

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Study on the rheological properties of Baker's yeast suspension

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Solecki M. , Heim A. , Owczarz P. , Kilbey G. , Delia M. L. , Frances C.

International Journal of Applied Mechanics and Engineering

2005

tom Vol. 10, no spec

137-142

Rheological properties of a suspension of baker's yeast Saccharomyces cerevisiae at the concentration ranging from 0.002 to 0.17g d.w./cm3 were investigated. Flow curves were determined at the temperature 4oC by means of cylindrical rotary one- and double-gap rheometers and a capillary rheometer. A significant effect of an increasing concentration of microorganisms on the growth of apparent viscosity of the suspension was reported. At lower concentrations and shear rates, significant discrepancies were often observed between properties determined by rheometers of different constructions and sizes. This follows from different properties of particular devices that are revealed especially near the limiting measuring ranges. For very small shear rates yield stresses were observed. Results of mathematical modeling and a complete analysis of results show that the yeast suspension has the properties of Newtonian liquids.