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Národní úložiště šedé literatury Nalezeno 28 záznamů.  předchozí11 - 20další  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Porosity and Cell Size of CO2 Blown Polystyrene Foams: Experiments and Modelling.
 Sovová, Helena ; Nistor, A. ; Topiař, Martin ; Kosek, J.
In our experiments, polystyrene films of the thickness of hundreds of micrometers up to a few milimeters were exposed to supercritical CO2 at saturation conditions in the range of 40-100 °C and 18-28 MPa. Additional experiments were conducted with polystyrene modified with light hydrocarbons. The cell size distribution and porosity of foams were measured and related to the saturation conditions and depressurization time.
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Preparation of Microcellular Polystyrene Foams with Supercritical CO2 and Co-Solvent.
 Topiař, Martin ; Nistor, A. ; De Masi, D. ; Kosek, J.
In this work, we use co-solvents to increase the foam porosity. Microcellular PS foams were prepared by the pressure induced foaming method using scCO2 and various co-solvents.
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Supercritical Fluid Extraction of Eucalyptus Volatile Oil in View of Thermodynamic Modelling.
 Sovová, Helena ; Stateva, R.P. ; Topiař, Martin
The aim of this contribution is to determine this relationship in the case of eucalyptus oil. The oil from the leaves of Eucalyptus grandis L., which was selected for experiments, is rich in a monoterpene alfa-pinene, a monoterpene oxide 1,8-cineole, a sesquiterpene aromadendrene, and a sesquiterpene alcohol globulol. The composition of saturated vapour phase in volatile oil+CO2 system was measured by sampling the extract from either milled dry leaves or essential oil on inert carrier, using a sufficiently large solvent residence time. Gas chromatography was used to analyse the composition of the samples, leaves, and essential oil. The extraction pressure and temperature were varied in the region of scCO2 with relatively low density, where the solvent selectivity is more pronounced. The experimental results were used to determine the temperature dependence of the parameters of thermodynamic model for the studied system.
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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.
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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.
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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.
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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.
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Deep Oxidation of Ethanol over Co-Mn-Al Mixed Oxides Supported on Pelletized Magnesia-Alumina: Role of Acid-base Properties.
 Jirátová, Květa ; Balabánová, Jana ; Kovanda, F. ; Obalová, L.
In the present study, we applied the method of impregnation using acidic solution of metal salts in combination with a support having basic properties that could limit penetration of active components into the support pellets.
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Co3O4 Supported on Different Supports for N2O Decomposition.
 Klyushina, A. ; Pacultová, K. ; Jirátová, Květa ; Obalová, L.
In this work Co3O4 catalysts supported on different kind of shaped supports (rings, quadrulobes) were prepared by incipient wetness impregnation method. As support materials commercial supports made of MgAl oxides, Al2O3 and TiO2 were used. The catalysts were characterized by AAS, XRD, Raman, FTIR, SEM, H2-TPR and nitrogen adsorption methods and tested for nitrous oxide decomposition.
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Simple Equipment for Measurement of Total Pressure Tested on Poly(ethylene glycol) + Water System.
 Pavlíček, Jan ; Bogdanić, Grozdana ; Wichterle, Ivan
In this work, new equipment designed for total pressure determination in mixtures where one of component is not volatile, such as polymer + solvent systems, is presented. It enables measurement of pressure above solutions in a wider concentration range. The equipment has been tested and calibrated using vapour pressure of pure water. It consist of thermostat with temperature measurement (AΣΛ, model F250), 100 ml vessel for solution with magnetic stirrer with a very strong driver, and of heated manifold for charging, degassing and for pressure measurement. Pressure is measured with use of absolute heated capacitance unit MKS Baratron (pressure range 1000 Torr = 133 kPa). Mixtures were prepared by weighing to obtain volume of 50 ml, approx.
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