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Národní úložiště šedé literatury Nalezeno 19 záznamů.  1 - 10další  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Modelling of Binary Nucleation in Laminar Co - Flow Tube.
 Trávníčková, Tereza ; Havlica, Jaromír ; Hrubý, Jan ; Ždímal, Vladimír
Particle nucleation is one of the important phenomena encountered in both chemical engineering and environmental studies. The Laminar Co-Flow Tube (LCFT) was designed for experimental measurement of binary and ternary nucleation of mixtures of atmospheric aerosols at laboratory conditions, most often H2SO4 + H2O + amines (MEA, TEA)/terpenes (alfa-pinene, limonene). Two models were used for mathematical modeling of momentum and mass transfer in the LFDC. 2D axisymmetric CFD model and simplified 1D analytical model. A parametric study was carried out using both models and the influence of the individual simplifications of analytical model on overall behavior of the system was discussed.
Plný tet: SKMBT_C22019110512052 - Stáhnout plný textPDF
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Indoor Particles of Outdoor Origin in Depositories.
 Mašková, Ludmila ; Smolík, Jiří ; Trávníčková, Tereza ; Havlica, Jaromír ; Ondráček, Jakub ; Ondráčková, Lucie
Pollution in indoor environment can cause irreversible degradation of materials stored there. The air quality in depositories housed in historical buildings depends mainly on outdoor pollution infiltrated through the building envelope. There are several strategies to control the indoor air pollution. However, most of them including reconstruction, which is problematic in historical monuments. Thus detailed information about indoor air quality and factors influencing it is needed.
Plný tet: SKMBT_C22019110512070 - Stáhnout plný textPDF
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The Effect of Collision Parameters and Particle Diameter on Dynamics and Mixing Process of Granular Material by using Discrete Element Method.
 Kozakovič, M. ; Paříková, A. ; Trávníčková, Tereza ; Kohout, M. ; Havlica, Jaromír
This contribution is focused on mixing dynamics and homogenization process of the granular material via Discrete Element Method. The simulation is conducted by using open-source code LIGGGHTS. The mixing process of approximately forty-two thousand monodisperse spherical particles is simulated in a vertical cylindrical mixer with two opposed flat blades. The rake angle of blades is 45°. The mixing process was studied with varying blade rotational speed (from 15 rpm to 540 rpm), coefficient of friction (from 0.05 to 0.9), coefficient of restitution (0.1 to 1.0), Poisson’s ratio (0.1 to 0.45) and particle diameter (2mm, 4 mm). Each of simulated processes was performed for 80 stirrer revolutions.\n\n\n\n
Plný tet: SKMBT_C22018100509470 - Stáhnout plný textPDF
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Nucleation of H2SO4-H2O in Laminar co-Flow Tube: CFD Simulations and Analytical Modelling.
 Trávníčková, Tereza ; Havlica, Jaromír ; Hrubý, Jan ; Ždímal, Vladimír
In this work the validity of two mathematical models differing in the complexity of flow dynamics is tested on two new nucleation isotherms measured by LCFT device. The first model is CFD and commercial software Fluent 16.2 is used for hydrodynamics evaluation. The second one is analytical programmed in the Matlab (Coflow).
Plný tet: SKMBT_C22018100509441 - Stáhnout plný textPDF
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Experiments on Bubble Breakup Induced by Collision with Vortex Ring.
 Zedníková, Mária ; Stanovský, Petr ; Trávníčková, Tereza ; Vejražka, Jiří
The aim of present work is to provide an experiment, in which a single bubble collides with a single eddy. Such simulation of bubble-eddy collision provides experimental data suitable for validation of theoretical models..
Plný tet: SKMBT_C22018100509430 - Stáhnout plný textPDF
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Matematické modelování nukleace kyseliny sírové s vodou v laminární souproudé komoře.
 Trávníčková, Tereza ; Havlica, Jaromír ; Hrubý, Jan ; Ždímal, Vladimír
Plný tet: SKMBT_C22017112809424 - Stáhnout plný textPDF
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Numerical Investigation of Agitated Beds Homogenization in Dependence on Bed Depth via DEM.
 Barczi, T. ; Trávníčková, Tereza ; Kohout, M. ; Havlica, Jaromír
In this contribution open source DEM particle simulation software LIGGGHTS was used. Collision forces are there modelled by the soft-sphere approach with the Hertzian collision model.
Plný tet: SKMBT_C22016090211352 - Stáhnout plný textPDF
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Evaluation of Residence Time Distribution in Millireactor with Laminar Flow: Comparison of Experiments, CFD and Laminar Flow Model.
 Hejda, Stanislav ; Trávníčková, Tereza ; Havlica, Jaromír ; Stavárek, Petr ; Staněk, Vladimír
We present a study of RTD in the case of small straight channels. RTD measurements in liquid phase were performed by a dye injection and its absorbance measurements with a spectrometer at the inlet and the outlet of the reactor. The method consistency was confirmed by a dye mass balance between inlet and outlet which was satisfied with an error of 5% rel. The RTD in the measured section was characterized by so called e-curve E (t), mean residence time and Peclet number for different flow conditions (Reynold´s numbers). The RTD data for various channel lengths and liquid flow rates were compared.
Plný tet: SKMBT_C22016090211351 - Stáhnout plný textPDF
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Binary Nucleation of H2SO4-H2O in Laminar Co-Flow Tube.
 Trávníčková, Tereza ; Škrabalová, Lenka ; Havlica, Jaromír ; Hrubý, Jan ; Ždímal, Vladimír
In this paper we present the first results of measurements on this device. It appears that with this type of chamber equivalent results as measured on the flow chambers with turbulent mixing can be obtained. Moreover, the use of super-clean gases in our experiment helps to eliminate the impact of amines and other\ncompounds to stabilize the clusters.
Plný tet: SKMBT_C22016090211350 - Stáhnout plný textPDF
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Effect of BladeRake Angle on Dynamics and Homogenization of Granular System in a Vertical Bladed Mixer.
 Trávníčková, Tereza ; Havlica, Jaromír ; Kohout, M.
In our contribution we will explain the relationship between the dynamics of the mixing process and the process of homogenization. We believe that results of this comprehensive study will be helpful in optimizing the design and operation of the mixing devices.
Plný tet: SKMBT_C22016090211342 - Stáhnout plný textPDF
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