Results 251 to 260 of about 1,553,042 (294)
Axial diffusion effect on concentration dispersion
International Journal of Heat and Mass Transfer, 2015 This work presents an analytical attempt to illustrate the effect of axial diffusion on concentration dispersion in packed tube flows. The concentration moment method is applied to derive the analytical solution for time-dependent Taylor dispersion ...
Zi Wu, G Q Chen
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A new numerical method for axial dispersion characterization in microreactors [PDF]
Chemical Engineering Science, 2017 Axial dispersion is a key phenomenon in reactor engineering that can affect yield and selectivity when reactions are carried out. Therefore its characterization is necessary for an adequate modelling of the reactor. The development of compact reactors to
Christophe Gourdon, Michel Cabassud
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Experimental Thermal and Fluid Science, 1993
Abstract A periodic transient test 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 model uses a parameter called the axial dispersive Peclet number to account for the deviation of the flow pattern from ideal plug flow. It takes
W. Roetzel, X. Luo, Y. Xuan
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Abstract A periodic transient test 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 model uses a parameter called the axial dispersive Peclet number to account for the deviation of the flow pattern from ideal plug flow. It takes
W. Roetzel, X. Luo, Y. Xuan
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Axial dispersion coefficient in high-speed counter-current chromatography
Journal of Chromatography A, 2009Experimental measurements of axial dispersion coefficients in high-speed counter-current chromatography have been carried out in the single-phase and two-phase modes. Axial dispersion coefficients were calculated from the residence time distribution curve (or the elution profile).
Zhao, Chun-Xia +2 more
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On the constancy of axial dispersion coefficients in liquid fluidized beds
The Chemical Engineering Journal, 1992Abstract The assumption of constant axial dispersion coefficient in residence time distribution (RTD) experiments is examined for liquid fluidized beds. Experimental results show this assumption to be violated in short beds. A quantitative criterion is proposed for the constraint required to achieve the true value of the axial dispersion coefficient ...
Mohammad Asif +2 more
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Liquid backmixing in bubble columns and the axial dispersion coefficient
AIChE Journal, 1998AbstractLiquid backmixing in bubble columns is commonly described using the 1‐D axial dispersion model, wherein all the contributing mechanisms leading to liquid macromixing are lumped into a single axial dispersion coefficient. No relationship has been reported that allows the quantification of various fluid‐dynamic contributions to the axial ...
Sujatha Degaleesan +1 more
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Experimental determination of axial dispersion coefficient in a bubble column
Chemical Engineering Science, 1980Abstract A new graphical method of finding axial dispersion coefficients in a bubble column is developed. This method requires only the area above an experimental curve, thus is simpler than the conventional method of curve fitting. The new method is used to find the dimensionless dispersion number in the bubble column and shows that the dispersion ...
Soon-Jai Khang, Samir P. Kothari
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A general correlation to predict axial dispersion coefficients in aerated channel reactors
Water Research, 2008Tracer studies have been widely applied to characterize the flow behavior in activated sludge reactors. The channel reactor with bottom aerators is one of the widespread designs in large wastewater treatment plants. Its flow behavior is well modeled either as a plug flow reactor with axial dispersion or as the perfect mixing cells in series.
Le Moullec, Y. +3 more
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Behavior of macromolecules in dilute solutions: II—On the axial dispersion coefficient
The Canadian Journal of Chemical Engineering, 1975AbstractUsing pulse‐input technique, axial dispersion coefficients were determined for polystyrene in tetrahydrofuran, in toluene and in a toluene/methanol mixture flowing in a long capillary tube under conditions such that the Reynolds number was less than 500. Low polydispersity polystyrene materials with nominal molecular weights ranging from 900 to
H. R. Chen, L. P. Blanchard
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Axial Dispersion Coefficients for Laminar Flows in Water Distribution Systems
World Environmental and Water Resources Congress 2009, 2009A dispersive transport component has recently been incorporated into the constituent transport equation used for modeling water quality in pressurized distribution systems. Among the various issues that arose from this major development, dispersion coefficients (E) relevant to water distribution systems still remain unknown.
P. Romero-Gomez +3 more
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