Results 151 to 160 of about 661 (214)

Axial diffusion effect on concentration dispersion

International Journal of Heat and Mass Transfer, 2015
Abstract 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 coefficient.
Zi Wu, G Q Chen
exaly   +2 more sources

AXIAL DISPERSION IN THE ANNULAR BED REACTOR

Chemical Engineering Communications, 1984
The objective of the present work was to study the effects of axial dispersion on the behavior of the annular bed reactor using the methanation of carbon monoxide as the test reaction.
Mark E Davis
exaly   +2 more sources

Axial dispersion in biofilters

Biochemical Engineering Journal, 1998
Abstract Biological destruction of toluene vapor from air streams was studied in a laboratory scale biofilter. The packing material (peat) used in the reactor was immobilized with acclimatized bacterial suspension. The original microbial consortium was obtained as an activated sludge suspension from a local waste water treatment plant.
S.M. Zarook, A.A. Shaikh, S.M. Azam
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +2 more sources