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1 Polish Journal of Chemical Technology

2 2015

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Mixing characteristics for gas-liquid system in an external-loop air-lift column

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Musiał M. , Bitenc M. , Karcz J.

This paper presents the results of the experimental investigations of hydrodynamics for an external-loop air-lift column. Process characteristics (gas hold-up, liquid velocities, liquid circulation time and mixing time) were analyzed as a function of the modified Froude number. The obtained results were presented graphically and in the form of the quantitative correlations.

Experimental analysis of an effect of the nutrient type and its concentration on the rheological properties of the baker’s yeast suspensions

100%

Major-Godlewska M. , Bitenc M. , Karcz J.

Polish Journal of Chemical Technology

2015

tom 17

nr 3

110-117

The aim of the study presented was to experimentally analyze an effect of the nutrient type and its concentration on the variability of rheological properties of the baker’s yeast suspensions for different time periods. Aqueous suspensions of the baker’s yeast of various concentration (solution I, without nutrient) and yeasts suspended in aqueous solution of sucrose or honey as nutrients with different concentration (solution II or solution III) were tested. Experiments were carried out using rotational rheoviscometer of type RT10 by a company HAAKE. The measurements were conducted for different time periods (from 1 h up to 144 h) at given fluid temperature. On the basis of the obtained data, rheological characteristics of the aqueous solution of baker’s yeast suspensions without and with nutrients of different sucrose or honey concentration were identified and mathematically described.