Results 261 to 270 of about 1,497,791 (338)
On the effect of tracer density on axial dispersion in a batch oscillatory baffled column
Chemical Engineering Journal, 2002 In this paper, we report our modelling evaluation on the effect of tracer density on axial dispersion in a batch oscillatory baffled column (OBC). Tracer solution of potassium nitrite, its specific density ranged from 1.0 to 1.5, was used in the study ...
Xiongwei Ni, Tony Howes
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Axial dispersion in packed beds
Chemical Engineering Science, 1975Abstract 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
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Axial dispersion in aeration tanks
Water Quality Research Journal, 1966Abstract 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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The correlation of axial dispersion data
The Canadian Journal of Chemical Engineering, 1970AbstractThe 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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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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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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Augmentation of Axial Dispersion by Intermittent Oscillatory Flow
Journal of Biomechanical Engineering, 1998The 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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Chemical Engineering JournalThe Gas Flow Modulation technique (GFM) is a recently introduced approach for measuring axial gas dispersion coefficients in bubble columns. This technique overcomes the limitations of the traditional tracer-based ap- proaches, enabling axially ...
Sara Marchini +2 more
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On axial dispersion in fixed beds
Chemical Engineering and Processing: Process Intensification, 1993Abstract 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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Microscopic calculation of axial dispersion for quaterthiophene crystals
Journal of Luminescence, 2005We 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 +6 more
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Axial dispersion in packed fiber beds
The Chemical Engineering Journal and the Biochemical Engineering Journal, 1995Abstract 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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