PERMEABILITY STUDIES: I. SURFACE AREA MEASUREMENTS USING A MODIFIED KOZENY EQUATION

1946 ◽  
Vol 24a (6) ◽  
pp. 103-116 ◽  
Author(s):  
J. C. Arnell
Keyword(s):  
Atmospheric Pressure ◽  
Fine Particles ◽  
Gas Permeability ◽  
Flow Equation ◽  
Granular Bed ◽  
Knudsen Flow ◽  
Surface Areas ◽  
Permeability Studies ◽  
Modified Equation

The Kozeny equation for the determination of surface areas by the gas-permeability method has been modified by the introduction of a second term, which takes the form of the Knudsen flow equation. This modified equation gives consistent results for the specific surface of a granular bed of fine particles with mean pressures of the flowing gas ranging from 2.6 cm. to almost atmospheric pressure. The results obtained from experimental data are in agreement with those calculated by direct visual and electron microscope counting.

A possible modification of groundwater flow equation using coordinate transformations

2014 ◽  
Vol 15 (2) ◽  
pp. 278-287 ◽  
Author(s):  
Abdon Atangana ◽  
Ernestine Alabaraoye
Keyword(s):  
Groundwater Flow ◽  
Prolate Spheroid ◽  
Flow Equation ◽  
Time Space ◽  
Adomian Decomposition ◽  
Iteration Methods ◽  
Groundwater Flow Equation ◽  
Factor Α ◽  
Modified Equation ◽  
Good Agreement

We described a groundwater model with prolate spheroid coordinates, and introduced a new parameter, namely τ the silhouette influence of the geometric under which the water flows. At first, we supposed that the silhouette influence approaches zero; under this assumption, the modified equation collapsed to the ordinary groundwater flow equation. We proposed an analytical solution to the standard version of groundwater as a function of time, space and uncertainty factor α. Our proposed solution was in good agreement with experimental data. We presented a good approximation to the exponential integral. We obtained an asymptotic special solution to the modified equation by means of the Adomian decomposition and variational iteration methods.

scholarly journals Determination of several fullerenes in sewage water by LC HR-MS using atmospheric pressure photoionisation

2015 ◽  
Vol 2 (2) ◽  
pp. 167-176 ◽  
Author(s):  
E. Emke ◽  
J. Sanchís ◽  
M. Farré ◽  
P. S. Bäuerlein ◽  
P. de Voogt
Keyword(s):  
Atmospheric Pressure ◽  
Sewage Water ◽  
Normal Phase ◽  
Phase Column

By using a normal phase column, this method is capable of unambiguously identifying and quantifying (functionalised) fullerenes in sewage water.

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