scholarly journals Gaseous dispersion into stratified building wakes

1970 ◽  
Author(s):  
B. T. Yang ◽  
R. N. Meroney
Keyword(s):  
Gaseous Dispersion

Gaseous dispersion in laminar flow through a circular tube

1965 ◽  
Vol 284 (1399) ◽  
pp. 540-550 ◽  
Keyword(s):  
Circular Tube ◽  
Dispersion Coefficient ◽  
Straight Tube ◽  
Laminar Regime ◽  
Thermal Conductivity Detector ◽  
Longitudinal Dispersion Coefficient ◽  
Dispersion Coefficients ◽  
Effective Dispersion ◽  
Flow Through ◽  
Gaseous Dispersion

The dispersion of a pulse of ethylene injected into nitrogen, flowing in the laminar régime through straight and curved tubes, has been investigated at pressures of 1.0 and 4.4 atm. From the study of the concentration profiles with a thermal conductivity detector (katharometer) it is found that the experimental results for gas velocities between 1.00 and 16.00 cm/s agree well with the analytical solution to this problem for a straight tube given by Sir Geoffrey Taylor and extended by Aris. In particular, at low velocities, the effective dispersion coefficients tend to the molecular diffusivities. The presence of a bend slightly reduces the effective longitudinal dispersion coefficient and the introduction of constrictions enhances it. Data are also given on a number of other gas pairs. It is concluded that measurements of dispersion provide an accurate and simple way of studying diffusion in gas mixtures.

scholarly journals The Use of 14C in Natural Materials to Establish the Average Gaseous Dispersion Patterns of Releases from Nuclear Installations

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 593-602 ◽  
Author(s):  
R L Otlet ◽  
A J Walker ◽  
H Longley
Keyword(s):  
Good Precision ◽  
Main Study ◽  
Dispersion Models ◽  
Individual Tree ◽  
Natural Materials ◽  
The Past ◽  
Dispersion Patterns ◽  
Nuclear Installation ◽  
Experimental Values ◽  
Gaseous Dispersion

The Harwell Low Level measurements Laboratory has been measuring a variety of natural materials from locations close to United Kingdom nuclear installations since 1977. The measurements are made first, to establish the past effects of releases to the atmosphere of 14C as observed from individual tree rings and second, to establish dispersion contours averaged over extended periods. The main study area has been in Cumbria, around the BNFL nuclear installation at Sellafield. 14C, which can be measured to good precision even at values close to the normal natural levels, provides a powerful technique for the provision of practical experimental values much wanted for theoretical dispersion models.

Concentration meter for wind tunnel studies of gaseous dispersion

1972 ◽  
Vol 6 (12) ◽  
pp. 911-916 ◽  
Author(s):  
Jiří Motyčka ◽  
Hans J. Leutheusser
Keyword(s):  
Wind Tunnel ◽  
Gaseous Dispersion

scholarly journals Geometric and mechano-sorption modification of fumed nanosilica in the gaseous dispersion media

2019 ◽  
Vol 20 (1) ◽  
pp. 22-26 ◽  
Author(s):  
E.F. Voronin ◽  
L.V. Nosach ◽  
V.M. Gun’ko ◽  
B. Charmas
Keyword(s):  
Molecular Weight ◽  
Bioactive Compounds ◽  
Inorganic Salts ◽  
Low Molecular Weight ◽  
Polymeric Systems ◽  
Low Molecular Weight Compounds ◽  
Dispersion Media ◽  
Gaseous Dispersion

Methods of geometric and solvate-stymulated mechano-sorption-activated modification of fumed nanosilica in the gaseous dispersion media were developed and used to prepare functionalyzed nanofillers for polymeric systems. Non-volatile high- and low-molecular weight compounds (such as polymers, organic bioactive compounds, organic and inorganic salts) can be used as modifiers of nanofillers.

Gaseous dispersion in laminar flow through a circular tube with mass transfer to a retentive layer

1966 ◽  
Vol 293 (1435) ◽  
pp. 562-572 ◽  
Keyword(s):  
Circular Tube ◽  
Porous Solid ◽  
Physical Parameters ◽  
Concentration Profiles ◽  
Thermal Conductivity Detector ◽  
Gaseous Diffusion ◽  
Flow Through ◽  
Flowing Stream ◽  
Gaseous Tracer ◽  
Gaseous Dispersion

The dispersion of a pulse of a gaseous tracer injected into a flowing stream of a second gas has been studied under conditions where the tracer can also exchange by diffusion with a stagnant gaseous zone held in a porous solid. Such a system closely models that used in gas chromatography with capillary columns, and it has the advantage that the geometric and physical parameters may be controlled and measured more accurately than in a chromatographic column. From the study of the concentration profiles of the tracer with a thermal conductivity detector (katharometer) it is found that the experimental results for gas velocities between 1 and 30 cm/s agree well with the analytical solution to the problem given by Aris. It is shown that dispersion of the tracer may also be correlated with the structure of the porous solid and consequently such measurements may be of value in the study of gaseous diffusion in catalysts and other porous materials.

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