[PDF] Top 20 Gaseous diffusion in porous media. Part 2.-Dry granular materials

... It is of interest to make the following comparison (Table 3) between values for D/Do for spherical particles obtained using equation (7) and from the Burger and Bruggeman equation[r] ... See full document

... The sample was then placed on a suction plate (sintered glass or other porous material), brought into equilibrium with a chosen water potential, a set of diffusion measure[r] ... See full document

... Do = D,,p(273/T)”. For a system of straight parallel tubes, the porosity E is simply AeIA, where Ae is the total cross-sectional area of the parallel tubes and A is the [r] ... See full document

... gas diffusion media of commercial porous electrodes, are: i) diffusion limitations of reagents and products (water and waste gas) as a function of pore diameter, and ii) limitations of ... See full document

... screen. Part 2 of this study will report on the optimised production know-how of these underlays, and compare their acquired properties with commercially available underlays of similar calibre in accordance ... See full document

... speed. This method involves exciting a column of granular material over a range of frequencies. A peak in the detected amplitude determines the resonant frequency. This frequency combined with the length of the ... See full document

... T he ad aptiv e control has its ro o ts in th e m id-fifties. A com prehensive tre a tm e n t of th e fund am ental theory of ad ap tiv e control is given in [2] [15]. A daptive ro b o t control began in th e ... See full document

... Choose 1 of the items that you would like to change in your community and create a poster in English engaging other community members to help.. (Use the guidelines to assist you.).[r] ... See full document

... of granular materials has become much more ...investigating granular materials at the particle scale, there are broadly two camps: one which seeks to characterize granular assemblies, ... See full document

... ϕ µ (5) Ertekin et al. [10] suggested that flow mechanisms of gas in tight reservoirs are influenced by Darcy flow as well as gas molecular concentration gradient. In fact, in tight porous systems gas flow due to ... See full document

... [1, 2, 7]; u U ∗ = ∫ ∫ [cosh ψ̅ − 1 + Zen ∞ (z=0) kT|∇n ∞ | E sinh ψ ̅ ]d(𝒦y) d(𝒦y) 𝒦y ∞ 𝒦y 0 (23) In ...[1, 2, 7]; 𝑢 ∞ 𝑈 ∗ = 𝛽 𝑍𝑒𝜁 𝑘𝑇 + 4 ln cosh ( 𝑍𝑒𝜁 4𝑘𝑇 ) (24) ... See full document

... Poland [1947], suggested several practical methods of controlling sea- water intrusion such as: balancing long-term basic-wide draft and replenish:flekt; maintenance of fresh-water h[r] ... See full document

... The oxidation process is very fast and the polymer gets modified by either cross linking or chain scission reaction creating alteration in molecular weight and loss in mechanical performance. During the process both ... See full document

... a granular column, in which the flow exhibits both erosion and ...of granular columns and showed that the major governing parameter is the aspect ratio, defined as the ratio of the initial height to the ... See full document

... of granular materials at high shear rates was done by the pioneering work of Bagnold (1954), who studied buoyant particles in a plane shear ...of granular ows in the collisional ...of granular ... See full document

... saturated porous media is significant in environmental geomechanics engi- neering because of its relevance to consolidation of porous media in unsaturated ...in porous media may ... See full document

... the porous media and the fluid flow (Bear, 1972; Sposito, 1980; Steefel and Lasaga, 1994; Dewers and Ortoleva, 1994; Indelman and Abramovici, 1994; Cushman and Moroni, ... See full document

... Coulomb friction acting along the channel walls. A principal part of the problem concerns the particular constitutive postulates which relate the stresses and strain [r] ... See full document

... (ECH 2 O EC-5, Decagon Devices), thermal conductivity (SH-1, Decagon Devices), and capillary pres- sure (porous cup tensiometer, Soilmoisture Equipment ... See full document

... Samples of the pore fluid for chemical analysis were taken every 2 to 4 days during the experiment via nine nar- row bore (ID = 0.5 mm) PEEK tubes located along the length of the test chamber. The sampling tubes ... See full document