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Pipeline transport of fossile fuels
Vlasák, Pavel ; Berman, V. ; Chára, Zdeněk
The paper deals with hydraulic pipeline transport of fossil fuels. A general analysis of coal and heavy viscous oil pipelining systems is introduced and pipeline transport of concentrated coal-water slurry, coal-water fuel, coal pipelining in other than water carrier liquid (e.g. methanol) and capsule pipeline transport (coal-log pipelining) is described.
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Thinning of kaolin slurry
Vlasák, Pavel ; Chára, Zdeněk ; Konfršt, Jiří
After mixing kaolin with water attractive and repulsive forces between kaolin particles initiate process of coagulation and peptisation, respectively. The coagulation process in the kaolin slurry gives rise to voluminous aggregates of kaolin particles, where a great deal of water is fixed.
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Transport hrubých částic v nenewtonovských suspenzích
Vlasák, Pavel ; Chára, Zdeněk ; Konfršt, Jiří
The paper deals with flow behaviour of slurries containing colloidal, clay, dust and also coarse-grained particles. The slurry flow behaviour changes form Newtonian to non-Newtonian in dependence on the solid phase concentration and composition, especially on the contents of colloidal particles. Flow behaviour of fluidic fly and bottom ash slurries, clay and sand slurries was experimentally investigated with respect to the solids composition, volumetric concentrationa and slurry velocity. The re-circulation pipe loop with smooth stainless steel pipes of the inner diameters D = 17.5, 26.8 and 36 mm was used for measuring the slurry flow parameters. Also the effect of time and intensity of shearing was studied for time dependent fluidic ash slurries
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Experimentální výzkum odporu rotačně se pohybující kulové částice
Lukerchenko, Nikolay ; Kvurt, Y. ; Chára, Zdeněk ; Vlasák, Pavel
Saltatory solid particles conveyed by fluid impact a channel bed from time to time. As a result of the collision the particles receive angular velocity, which gradually decreases with time. For numerical simulation of saltation it is necessary to know values of the drag rotation coefficient. In this paper experimental results of the rotating spherical particles moving in water are described. The rubber spherical balls with density near that of water were used; each of them was speeded up in a special chute that ensured that the particle rotated in a given plane. Values of the drag coefficient of the rotating spherical particle were determined in a dependence on rotation particle Reynolds number
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