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Axial and Radial Dispersion in Rolling Mode Rotating Drums

Powder Technology, 2005
Single particle trajectories, obtained using the Positron Emission Particle Tracking (PEPT) technique, have been used to characterise axial and radial dispersion of granular media in the rolling drum operated in batch and continuous mode.
Xianfeng Fan, D J Parker, J P K Seville
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Axial dispersion in packed beds

Chemical Engineering Science, 1975
Abstract Behaviour of axial dispersion in packed beds is made clear from the properties of the equation of continuity. New dispersion data are added to relate liquid data with gas data in the Stokes flow regime. A special device to send a plane impulse of tracer liquor was developed.
Terukatsu Miyauchi, Tatsuji Kikuchi
openaire   +1 more source

Axial dispersion in aeration tanks

Water Quality Research Journal, 1966
Abstract The primary function of an aeration tank is to provide sufficient time, and a suitable environment for the assimilation of organics by micro-organisms. Initally assimilation occurs by a rapid absorption or adsorption process. After this initial contact-phenomena between the waste and micro-organisms, the biochemical reactions ...
Peter L. Timpany, Keith L. Murphy
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DEM Investigation of the Axial Dispersion Behavior of a Binary Mixture in the Rotating Drum

Powder Technology, 2018
The granular motion of binary-size mixture in a three-dimensional rotating drum operating in the rolling regime is numerically tracked via the discrete element method (DEM), with a focus on the axial dispersion behavior of the different particle types in
Kun Luo, Jia Wei Chew, Liangqi Zhang
exaly   +2 more sources

Axial Dispersion

1992
Abstract The treatment in the previous chapter relates specifically to pure plug flow, which in practice occurs only in extractors such as discrete-stage mixer-settlers and perforated plate columns where phase separation is virtually complete between stages.
H R C Pratt, G W Stevens
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The correlation of axial dispersion data

The Canadian Journal of Chemical Engineering, 1970
AbstractThe axial dispersion which occurs when a binary gas mixture flows through a bed of inert, non‐porous particles is well understood when the dispersion is dominated by either molecular diffusion or by turbulent mixing. In this paper consideration is given to the dispersion which occurs in the transition region between these two extremes of ...
M. F. Edwards, J. F. Richardson
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Prediction of Axial Dispersion in Plug-Flow Reactors Using a Simple Method

Journal of Dispersion Science and Technology, 2012
In most full-scale plug-flow reactors, the flow usually is nonideal because of entrance and exit flow disturbances and axial dispersion. Axial dispersion refers to the degree of back mixing and molecular diffusion of fluid elements in the process stream ...
Alireza Bahadori
exaly   +2 more sources

Microscopic calculation of axial dispersion for quaterthiophene crystals

Journal of Luminescence, 2005
We present a microscopic calculation of the axial dispersion for the quaterthiophene crystal in a spectral region including the first and higher molecular excited states. After evaluating the complex dielectric tensor near the corresponding Frenkel excitons we observe that two of the principal axes referring to the upper Davydov states rotate with ...
LAICINI, MARCO, Spearman, P, TAVAZZI, SILVIA, RAIMONDO, LUISA, MIOZZO, LUCIANO, MORET, MASSIMO, BORGHESI, ALESSANDRO   +6 more
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Axial dispersion in respiratory bronchioles and alveolar ducts

Journal of Applied Physiology, 1988
The mixing of gases in the pulmonary acinus was characterized by analyzing axial gas dispersion during steady flow in models of respiratory bronchioles and alveolar ducts. An analysis (method of moments) developed for addressing dispersion in porous media was used to derive an integral expression for the axial dispersion coefficient (D*).
W J, Federspiel, J J, Fredberg
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Augmentation of Axial Dispersion by Intermittent Oscillatory Flow

Journal of Biomechanical Engineering, 1998
The efficiency of axial gas dispersion during ventilation with high-frequency oscillation (HFO) is improved by manipulating the oscillatory flow waveform such that intermittent oscillatory flow occurs. We therefore measured the velocity profiles and effective axial gas diffusivity during intermittent oscillatory flow in a straight tube to verify the ...
G, Tanaka, Y, Ueda, K, Tanishita
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