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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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Hydraulics of overflowed bridge
Chára, Zdeněk ; Vlasák, Pavel
The paper deals with an open channel flow around model of a bridge when the water depth is higher than height of the bridge opening. Both the pressured flow through bridge opening and free surgace flow over the model were studied. For both cases discharge coefficients were determined and for overflowed model also the velocity profiles were measured to evaluate the ratio of discharges going below and over the bridge model.
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Laminar and turbulent transition in fine-grained non-Newtonian slurries
Vlasák, Pavel ; Chára, Zdeněk
The transition from laminar to turbulent flow regime is very important for design and operation of non-Newtonian slurries pipelining. The paper deals with experimental investigation of laminar/turbulent transition, flow behaviour and rheological parameters of fine grained highly concentrated non-Newtonian slurries in horizontal pipes. Research is focussed on different character of slurry behaviour in laminar and turbulent region and verification of prediction turbulent model.
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