Results 121 to 130 of about 12,352 (163)
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Axial dispersion coefficients in packed beds at low reynolds numbers
The Canadian Journal of Chemical Engineering, 1969AbstractPeclet numbers describing axial dispersion in gas flow through packed beds of spheres were obtained using a two measurement point, pulse technique in a test section four inches inside diameter and 5.14 feet high. Three packing sizes were investigated, corresponding to tube to particle diameter ratios of 6.4, 17, and 66In the experiments the ...
Jack C. Urban, A. Gomezplata
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The simultaneous determination of axial dispersion and mass transfer coefficients
Chemical Engineering Science, 1967Abstract A method is illustrated for the simultaneous determination of axial dispersion and mass transfer parameters for some continuous flow process operations. The procedure involves the matching of computed and experimental axial concentration profiles.
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MEASUREMENT OF AXIAL DISPERSION COEFFICIENT IN A PACKED BED USING X-RAY
Materials and Manufacturing Processes, 2002Dispersion of the liquid in a porous media is of great importance in many areas of engineering and has been studied by several researchers so far. A new experimental method has been developed to measure the dispersion coefficient. X-ray absorption technique provides a better understanding of dispersion that characterizes the mixing phenomenon in the ...
Basavaraj, MG, Gupta, GS
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A unified correlation for predicting liquid axial dispersion coefficient in bubble columns
Chemical Engineering Science, 2001Abstract Experimental measurements of gas holdup and liquid axial dispersion coefficients have been carried out in two bubble columns (column I; D c =15 cm and column II; D c =20 cm ), operating with co-current upflow of gas and liquid. In addition, measurement of bubble size was investigated.
S Moustiri +3 more
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Biotechnology Letters, 1991
The production of CO2 in tower fermenters which can cause back mixing, and thereby reducing the efficiency of such fermenters has been modelled with respect to fermentation. It is confirmed that the effect is significant. The effect of variations in the kinetic parameters, the maximum specific growth rate and the biomass yield coefficient was found to ...
T Setiadi, V. F. Larsen
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The production of CO2 in tower fermenters which can cause back mixing, and thereby reducing the efficiency of such fermenters has been modelled with respect to fermentation. It is confirmed that the effect is significant. The effect of variations in the kinetic parameters, the maximum specific growth rate and the biomass yield coefficient was found to ...
T Setiadi, V. F. Larsen
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A correlation for dispersed phase axial mixing coefficients in rotating disc contactors
Journal of Chemical Technology & Biotechnology, 2005AbstractA correlation for the estimation of dispersed phase axial mixing coefficients in terms of all the operating and fundamental variables was established. The proposed correlations are found to be a good representation of the present data (260 data points) obtained using four liquid‐liquid systems from two different sources.
Thanapalan Murugesan, Iyyasami Regupathi
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Industrial & Engineering Chemistry Research, 1996
Axial dispersion coefficients of squalene, benzoic acid, and oleic acid were measured in packed beds using supercritical carbon dioxide as a solvent over the temperature range 313−333 K, pressure range 100−300 bar, and Reynolds number range 2−80. Measurements were performed under both horizontal and vertical flow conditions, using a variety of particle
Owen J. Catchpole +2 more
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Axial dispersion coefficients of squalene, benzoic acid, and oleic acid were measured in packed beds using supercritical carbon dioxide as a solvent over the temperature range 313−333 K, pressure range 100−300 bar, and Reynolds number range 2−80. Measurements were performed under both horizontal and vertical flow conditions, using a variety of particle
Owen J. Catchpole +2 more
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Revue Générale de Thermique, 1998
An extended temperature oscillation measurement technique based on the axial dispersion model is proposed for the determination of both heat transfer coefficients and axial dispersion coefficients in heat exchangers. The test technique uses a sinusoidal inlet temperature variation which is realized with a computer controlled compact electric heater ...
Wilfried Roetzel, Xing Luo
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An extended temperature oscillation measurement technique based on the axial dispersion model is proposed for the determination of both heat transfer coefficients and axial dispersion coefficients in heat exchangers. The test technique uses a sinusoidal inlet temperature variation which is realized with a computer controlled compact electric heater ...
Wilfried Roetzel, Xing Luo
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Variation of the local effective axial dispersion coefficient with bed height in expanded beds
Chemical Engineering Journal, 2005Abstract The local axial dispersion characteristics are very important and fundamental for the analyzing, modeling and understanding of biomolecules adsorption performance in expanded bed adsorption. In this work, the local effective axial dispersion coefficients along the bed height of an expanded bed system with porous adsorbent particles ...
Junxian Yun +2 more
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Measurement of the axial dispersion coefficient of cohesive powders in rotary kilns
2016While continuous rotary calcination is a widely used thermal treatment in large-scale catalyst manufacturing, fundamental understanding of the process is absent from scientific literature. Thus, the goal of this research is to improve fundamental understanding of rotary calcination processes to aid in scale-up.
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