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  • 1
    Electronic Resource
    Electronic Resource
    The influence of walls on the motion of a sphere in non-Newtonian liquids (1983)
    Springer
    Rheologica acta 22 (1983), S. 27-33 
    Details
    ISSN: 1435-1528
    Keywords: Wall effect ; pseudoplasticity ; sphere ; drag
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The influence of the contained wall on the drag of a sphere moving through a non-Newtonian fluid is analysed in this work separately for the low Reynolds number and the high Reynolds number regions. In the former, we make use of the two-concentric-sphere model. It is predicted that the wall effect will decrease with the increase of the shear-thinning anomaly and this is in a reasonable agreement with the available experimental data and correlations. The wall effect in the high Reynolds number region is analysed in this work using the cell model (used to study the motion of an assemblage of solid spheres) and the predictions are in satisfactory agreement with the available empirical correlation for non-Newtonian fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01679826
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  • 2
    Electronic Resource
    Electronic Resource
    Approximate solutions for drag coefficient of bubbles moving in shear-thinning elastic fluids (1985)
    Springer
    Rheologica acta 24 (1985), S. 202-206 
    Details
    ISSN: 1435-1528
    Keywords: Bubble ; drag coefficient ; shear-thinning elastic fluid ; Ellis model ; Carreau model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The drag coefficient for bubbles with mobile or immobile interface rising in shear-thinning elastic fluids described by an Ellis or a Carreau model is discussed. Approximate solutions based on linearization of the equations of motion are presented for the highly elastic region of flow. These solutions are in reasonably good agreement with the theoretical predictions based on variational principles and with published experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333248
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  • 3
    Electronic Resource
    Electronic Resource
    A power-law fluid flow past a porous sphere (1981)
    Springer
    Rheologica acta 20 (1981), S. 128-132 
    Details
    ISSN: 1435-1528
    Keywords: Pseudoplasticity ; porous wall ; sphere ; drag ; sheardependent viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Es wird ein Modell für die Strömung einer nichtnewtonschen Flüssigkeit längs einer porösen Kugel entwickelt. Die auf die in einer Ostwald-DeWaele-Flüssigkeit bewegte Kugel ausgeübte Reibungskraft wird durch eine Näherungslösung der Bewegungsgleichungen für schleichende Strömung gewonnen. Man findet, daß der Einfluß der Abweichung vom newtonschen Verhalten um so ausgeprägter wird, je größer die Porosität ist.
    Notes: Summary A model has been developed for the flow of a non-Newtonian fluid past a porous sphere. The drag force exerted on a porous sphere moving in a power-law fluid is obtained by an approximate solution of equations of motion in the creeping flow regime. It is predicted that the effect of the pseudoplastic anomaly on the drag force is more pronounced at large porosity parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01513055
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of very small bubbles on kLa measurement in viscous microbiological cultures (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 345-347 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In gas-liquid dispersions based on viscous non-Newtonian fluids, numerous very small bubbles are formed due to their high residence times in contacting devices such as bubble columns. The influence of these small bubbles on the measurement of the volumetric mass transfer coefficient in the contactor by the dynamic CO2 gas analysis method is discussed. It is found that their effect on this measuring technique is insignificant compared to that when using the conventional dissolved-oxygen technique.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300303
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