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Experimental studies of heat transfer in system CMC solutions-air for reactor equipped with two stirrers

100%
Karcz J.
|
1993
|
issue 3
70-79
EN
Distributions of the in were experimentally evaluated along the wall of the jacketed, baffled nonstandard stirred tank equipped with two Rushton disc turbines. Local values of the heat transfer coefficient were measured by means of a special . Measurements were carried out for stirred tank with inner diameter D+0.3 m (liquid height in the tank H=2D). Results of the investigations were approximated analytically.
2
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CFD method for evaluation of critical impeller speed required for floating particles suspension

63%
Kacperski Ł., Karcz J.
Czasopismo Techniczne
|
-
PL
In the paper, critical impeller speeds were analyzed on the basis of the performed simulations of the concentration distribution of the floating particles suspension in an agitated vessel, equipped with pitched blade turbine. The required range of the standard deviation of the local particles concentration in a suspension was assumed as comparative criterion. The results obtained from numerical computations were compared with the values of the critical impeller speeds determined experimentally.
3
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Numerical study of hydrodynamics in an agitated vessel equipped with ecentrically located high-speed impeller

63%
Domański M., Karcz J.
Czasopismo Techniczne
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-
PL
In this study the results of numerical simulations of hydrodynamics in an agitated vessel with eccentrically located impeller (HE3 or propeller) are presented. Mathematical model of the velocity field is based on Navier-Stocks equation. Characteristics of turbulent flow of liquid is described with the use of CFD methods. In this work the Scale Adaptive Simulation approach coupled with Sliding Mesh method is used. The time-dependent simulations were carried out with ANSYS 14 CFX software.
4
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Mixing characteristics for gas-liquid system in an external-loop air-lift column

51%
Musiał M., Bitenc M., Karcz J.
Czasopismo Techniczne
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-
PL
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.
5
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Experimental analysis of an effect of the nutrient type and its concentration on the rheological properties of the baker’s yeast suspensions

51%
Major-Godlewska M., Bitenc M., Karcz J.
|
EN
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.
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