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Pokroky v popisu termodynamických vlastností soustav obsahujících alkanoly
Aim, Karel ; Nezbeda, Ivo
Two lines of research dealing with the applications of the so called primitive models (of association) to describe the thermodynamic properties of alkanolic systems will be outlined, namely (i) molecular simulations for the water and methanol mixtures, and (ii) equation of state developments for the alkanol and carbon dioxide systems. Molecular simulations on water–methanol mixtures were performed by using primitive models that descend from realistic models of molecular interaction for both compounds. The results for both the excess mixing and partial molar properties of the system over the entire concentration range were compared with the molecular simulation results for the commonly accepted complex realistic models (effective pair-wise potentials) and with experimental data.
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Studie chování stgoupajících bublin v různých kapalinách
Smutná, K. ; Wichterle, K. ; Večeř, Marek
Experimental work dealing with influence of liquid properties on behavior of medium-sized ellipsoidal bubbles (equivalent diameter 4 – 10 mm) is submitted in the contribution. The ellipsoidal bubble exhibits periodical motion with characteristic nonlinear trajectory. Contexture of the horizontal motion and the bubble wobbling is a course for characteristic bubble orientation throughout rising – bubble turns to ambient flow with the maximum crosssection.
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Oscilace tvarů stoupajících bublin
Wichterle, K. ; Smutná, K. ; Večeř, Marek
We have developed a mathematical model of this motion including two parameters: eccentricity of the ellipsoid and amplitude of the wobbling. Assuming statistically uniform rotation of the bubble, the model results probability density for all related quantities, i.e.: vertical and horizontal dimensions, equivalent ellipse axes, angle of inclination. By comparison of experimental data with the model predictions, parameters of the model have been evaluated. Evidently, gas bubble shape cannot be described by the common correlation suitable for drops.
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Nový tlakový snímač pro aplikaci v mikro chemickém inženýrství
Steckenborn, A. ; Křišťál, Jiří ; Kareš, T. ; Jiřičný, Vladimír ; Sichler, P. ; Krause, P.
In the contribution the construction and technical data of the flow-through micro channel pressure probe (FMPP) – a new In-Line Pressure Sensor – are presented. The experimental data of pressure drop measurements with different micro channels are compared: a micro reactor with rectangular channel and low aspect ratio and capillaries with inner diameters of 1.0, 0.5 and 0.1 mm. This work shows the capability of the probe for pressure drop measurements in one-phase flow (gas or liquid) and introductory measurement of two-phase gas-liquid flows. Some limits with the present state of the development are shown.
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