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Gas Hold-up and Volumetric Mass Transfer Coefficient of Various Impeller Types in Gas-Liquid Dispersion with Higher Viscosity
Zedníková, Mária ; Linek, V. ; Moucha, T.
In a vessel with inner diameter 0.29 m supplied by one, two or three impellers on a common shaft, there were measured transport characteristics (gas hold-up and volumetric mass transfer coefficient) in dependence on power consumption. As an impeller there was used the pitched blade impeller pumping the liquid either upwards or downwards. Air was used as a gas phase and 3% solution of Sokrat 44 as a liquid phase. The solution behaves as a newton liquid with viscosity 12.9mPa.s. Volumetric mass transfer coefficient was measured by dynamic pressure method. Gas hold-up and kLa were presented in dependence on power consumption and on gas superficial velocity. Results are compared with the data of given impeller types obtained in low viscous solutions and with the data of other impeller types.
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Risk ased inspection (RBI)
Přibáň, Miroslav ; Žemlička, F. ; Hora, Petr ; Vlach, J.
Risk Based Inspection (RBI) represents modern quickly developed practiceof inspection and in-service examination strategy of structure as part ofplant integrity management. The role of Acoustic emission in the RBI isdiscussed in the article and contribution of AE as part of the RBIstrategy is emphasized.
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Effect of surfactants ageing on drag reduction
Mík, Václav ; Myška, Jiří
Four different surfactants were investigated in a closed hydraulic loop in order to find the influence of age of the solution on drag reducing effectiveness and on decrease of critical shear stress. It shows that ageing of a particular surfactant is dependent on its concentration. Different sensitivity of solutions to flow disturbances indicates an individualism of single surfactants with worm-like micelles.
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Rheology and texture of multiphase emulsion systems
Štern, Petr ; Pokorný, J.
Sensory and texture analyses are important tools to characterise the acceptance of food products by consumers. The aim was to correlate the results of rheological and sensory analysis because they can directly an more easily be applied in production and quality control. As an example were chossen Tartar souces - emulsion of edible oil in an aqueous phase consisting of water, salts, vinegar, modified starch and other flavoring. Functional relations between rheological parameters of tartar souces and sensory characteristics were determined.
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(P,V,T) Behaviour of Benzene + C3-Alkylbenzene Liquid Systems at Temperatures 298.15 K to 328.15 K
Linek, Jan ; Morávková, Lenka
Densities of liquid systems benzene + isopropylbenzene, benzene + 1,2,4-trimethylbenzene, and benzene + 1,3,5-trimethylbenzene were measured at temperatures (298.15, 308.15, 318.15 a 328.15) K by means of a vibrating-tube densimeter. Excess molar volumes calculated from the density data yield the temperature dependence of this quantity within 298-328 K.
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Computer Treatment of the Viscometric Data Displaying Apparent Wall Slip Effect
Večeř, Marek ; Wein, Ondřej
In the present poster and a PC show, we demonstrate such software designe to support all available sensors (Z,PP, and CP) of HAAKE RS rotational rheometres, and including one novel (KK) sensor, designed specially for the liquids displaying AWS effect. The primary data, including the related calibration parameters, are extracted from the HAAKE RheoWin ASCII export and further treated in a plot-supportin dialogue mode, including selection/discrimination of a new 8-parameter model, representing the Fluidity&Slip viscometric material functions.
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Effective Transport Properties of Reconstructed Porous Catalysts
Salejová, G. ; Kosek, J. ; Šolcová, Olga ; Schneider, Petr
The structure of porous catalysts is traditionally characterized by textural analysis, such as mercury porosimetry and BET sorption isotherm. Moreover, the effective transport properties of porous catalysts could be measured in the Graham diffusion cell, in the permeation cell, etc. In this contribution the electron microscopy images of porous catalysts are systematically analyzed, the spatially 3D porous media are reconstructed and their effective transport properties evaluated and critically compared with experimental values of effective transport parameters.
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Transport Parameters of Porous Solids: Wicke-Kallenbach and Graham's Diffusion Cell
Soukup, Karel ; Šolcová, Olga
The arrangement has two disadvantages: the necessity to monitor composition of the two outlet gas streams, which requires analytical instruments and the strict requirement of equal pressure in both compartments. On the other hand measurement could be carry out in raised temperature and/or pressure. GrahamŽs diffusion cell is based on validity of GrahamŽs law. This cell overcomes both disadvantages of the classic Wicke-Kallenbach cell.
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