Results 261 to 270 of about 700,926 (305)

On axial dispersion in fixed beds

Chemical Engineering and Processing: Process Intensification, 1993
Abstract The primary purpose of this paper is to show that the criticisms by Tsotsas and Schlunder (1988) of an earlier paper (Gunn, 1969) are based upon elementary mathematical errors of the part of Tsotsas and Schlunder. A summary of experimental data on axial dispersion in liquids and gases shows that the dependence of the axial dispersion ...
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Axial Dispersion of Sedimented Colloids

Separation Science and Technology, 1982
Abstract After an ensemble of identical particles has had time to settle along the y-axis to their equilibrium distribution in a field of potential energy %oS(y) by gravity, but prevented from adsorbing by double-layer repulsion, their dispersion by Poiseuille flow between two horizontal plates is predicted. The residence-time distribution of particles
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Danckwerts' degree of segregation for the axial dispersion model

Chemical Engineering Science, 1991
Abstract Danckwerts' degree of segregation for the axial dispersion model has been calculated using some values of the Peclet number. The Monte Carlo technique has been applied to simulate a random walk, which is the discrete approximation of the axial dispersion model. The axial dispersion model's degree of mixing does not reach the state of maximum
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Strömungsungleichverteilung und axiale Dispersion in Festbetten

Chemie Ingenieur Technik, 1989
Modelisation de l'ecoulement fluide solide dans un lit de particule. L'etude se fait aux echelles micro, meso et macroscopique a partir des donnees experimentales obtenues a l'aide d'un ...
Evangelos Tsotsas, Ernst‐Ulrich Schlünder   +1 more
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Experimental characterization of axial dispersion in coiled flow inverters [PDF]

Chemical Engineering Research and Design, 2017
Narrow residence time distributions (RTDs) are desirable in many chemical engineering processes. However, when a system operates in the laminar flow regime, significant fluid dynamic dispersion takes place.
Luca Mazzei, Asterios Gavriilidis
exaly   +1 more source

Axial dispersion in beds of small particles

The Chemical Engineering Journal, 1972
Abstract Axial dispersion coefficients (EA) in beds of small (0.1–1 mm) particles are often needed to interpret reaction rate data. A chromatographic technique was used to evaluate such coefficients for beds of porous catalyst particles and beds of non-porous glass beads over a wide range of velocities (Rep = 0. 00237 to 11.9).
Motoyuki Suzuki, J.M. Smith
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Axial dispersion through tube constrictions

AIChE Journal, 1980
AbstractTracer gas dispersion was measured for laminar flow through three different tube constrictions, at orifice Reynolds numbers between 10 and 5000 and Schmidt numbers of 0.213 and 0.769. Each constriction generates a confined jet which significantly enhances axial dispersion at intermediate Reynolds numbers ranging from 100 to 1000.
David W. Weaver, James S. Ultman
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Axial Dispersion in an Apparatus with Mobile Packing

Collection of Czechoslovak Chemical Communications, 1993
The paper deals with modelling of the flow of liquid on a plate with mobile packing. The results of measurements have been interpreted by means of a simple dispersion model whose two parameters were determined from the nonideal step-input of a tracer and its response.
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Axial dispersion in coiled tubular reactors

Analytica Chimica Acta, 1986
Abstract A theoretical and experimental treatment of axial dispersion in coiled tubes is presented. The dispersion, δ, is related to the theoretical plate height divided by four times the radius of the tube (H/4r). This parameter, when plotted against the product of the Reynolds number and the Schmidt number (ReSc), accurately predicts maxima in ...
Denys F. Leclerc, Carr J. Smith, E.Clifford Toren   +2 more
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Axial dispersion in packed fiber beds

The Chemical Engineering Journal and the Biochemical Engineering Journal, 1995
Abstract The application of fibrous sorbent materials in gas and liquid separations as an alternative to conventional granular sorbents has attracted increased attention over the last decade. Though axial dispersion of flow in granular beds has been investigated extensively, published experimental data concerning the dispersion phenomena in porous ...
G. van Zee, R. Veenstra, J. de Graauw
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