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Transition Events in Trickle Bed Reactor under Conditions of Steady State and Pulse Regime
Jiřičný, Vladimír ; Staněk, Vladimír ; Hanika, Jiří ; Lederer, V. ; Ondráček, Jakub ; Vychodilová, Hana ; Šimek, J. ; Křišťál, Jiří ; Stavárek, Petr ; Vlček, Dalibor ; Karfík, David
Transition events in trickle bed reactor under conditions of steady state and pulse regime has been studied experimentally in pilot plant trickle bed reactor at elevated pressures 2 and 5bar and temperatures 20 and 50oC.The hydrodynamics maps have been determined in the form pressure drop dependences for wide range of gas and liquid flow rates.
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CFD Flow Simulation in Narrow Channel
Křišťál, Jiří ; Havlica, Jaromír ; Jiřičný, Vladimír
Important multiphase parameters as are volume fraction distribution, phase velocity, or shape and position of the interface are employed in our simulations of the hydrodynamics of gas-liquid flow in a thin-gap channel, 1 mm in width. The volume of fluid (VOF) interface tracking method is used to predict the trajectory and the velocity of a single bubble. The effect of bubble on liquid velocity field is investigated for three bubble sizes. Another goal is the evaluation of the effect of the inlet liquid velocity on bubble motion. The results of this study show different types of dependence of the bubble rise velocity on the inlet liquid velocity for different bubble sizes and also confirm that the ratio of the bubble size to the gap width has to be considered when designing the multiphase micro-reactor systems.
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Transition Phenomena in Trickle Bed Reactor under Steady Stay Gas/liquid Downflow. Part 1
Jiřičný, Vladimír ; Staněk, Vladimír ; Ondráček, Jakub ; Vychodilová, Hana ; Křišťál, Jiří ; Stavárek, Petr ; Vlček, Dalibor ; Karfík, David ; Lederer, J. ; Šimek, J.
Experimental measurement of co current gas/liquid downflow under conditions of steady state. Measurement of the effect of liqud physical properties and type od packing on pressure drop profile along the packed bed layer.
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Počítačová simulace hydrodynamického chování 3D elektrody
Křišťál, Jiří ; Jiřičný, Vladimír
In recent years, three-dimensional electrodes have been widely studied. In this design the cathode is formed by a slow-moving packed bed of metal particles. The advantage of this set-up is the continuous recovery of interfacial area between growing particles and the electrolyte. To achieve the proper particle size distribution and also to prevent apparatus breakdown due to bed plugging, it is essential to retain the mass-flow of particles. We focus on the design of three dimensional electrodes in which the mass flow will occur under a wide range of conditions. In the preliminary phase of our research, we use CFD package Fluent to study the hydrodynamic behaviour of a multiphase flow in a rectangular channel. For validation of numerical models, experiments for determination of real particle velocity profiles are carried out.
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