Results 271 to 280 of about 1,963,356 (295)
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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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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 ...
Dong-Qiang Lin +2 more
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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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Gas Holdup and Axial Dispersion Coefficient in Gas-Liquid Cocurrent Spout-Fluid Beds
Separation Science and Technology, 1996Abstract An experimental investigation was carried out to determine the effect of gas velocity, liquid velocity, and column diameter on the gas holdup and axial dispersion coefficients in cocurrent spout-fluid beds in three columns with diameters of 74, 114, and 144 mm, all with a height of 1.20 m, at superficial gas and liquid velocities of 0.001–0 ...
Mohammed Zohdi Anabtawi +2 more
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The Chemical Engineering Journal, 1973
Abstract The simplest way of testing flow systems for non-ideal flow behaviour is based on the axially dispersed plug-flow model. A very simple experimental technique involves manually injecting a dose of tracer into the system and following the resulting response(s) down-stream. A method is proposed using a general description fitting to such pulses
M. Šáchová, Z. Štěrbáček
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Abstract The simplest way of testing flow systems for non-ideal flow behaviour is based on the axially dispersed plug-flow model. A very simple experimental technique involves manually injecting a dose of tracer into the system and following the resulting response(s) down-stream. A method is proposed using a general description fitting to such pulses
M. Šáchová, Z. Štěrbáček
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Identification of axial dispersion coefficients by model method in gas/liquid/solid fluidised beds
Chemical Engineering and Processing: Process Intensification, 2001The axial dispersion coefficient, representative of the hydrodynamic behaviour of a fluidised bed, is determined by the model method. This method must be able to simulate the model. Therefore, a discretisation by orthogonal collocation is performed. Then, this determination is carried out in a fluidised bed, which tries to simulate an anaerobic biogas ...
B. Giojelli +4 more
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Revue Générale de Thermique, 1997
Residence time measurements are introduced as a transient measurement technique for the fast and convenient determination of axial dispersion coefficients in plate heat exchangers. In front of the exchanger inlet a salt solution pulse is injected into the steady flow stream and propagates with dispersion to the exit of the exchanger.
Wilfried Roetzel, Frank Balzereit
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Residence time measurements are introduced as a transient measurement technique for the fast and convenient determination of axial dispersion coefficients in plate heat exchangers. In front of the exchanger inlet a salt solution pulse is injected into the steady flow stream and propagates with dispersion to the exit of the exchanger.
Wilfried Roetzel, Frank Balzereit
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