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EN
In this paper, thermal processing of starch slurry in a Couette-Taylor flow (CTF) apparatus was investigated. Gelatinized starch dispersion, after treatment in the CTF apparatus, was characterized using such parameters like starch granule diameters (or average diameter), starch granule swelling degree (quantifying the amount of water absorbed by starch granules) and concentration of dissolved starch. These parameters were affected mostly by the process temperature, although the impact of the axial flow or rotor rotation on them was also observed. Moreover, the analysis of results showed a relatively good correlation between these parameters, as well as, between those parameter and apparent viscosity of gelatinized starch dispersion. Meanwhile, the increase in the value of the apparent viscosity and in shear-tinning behaviour of dispersion was associated with the progress of starch processing in the CTF apparatus. Finally, the CTF apparatuses of different geometries were compared using numerical simulation of the process. The results of the simulation indicated that the apparatus scaling-up without increasing the width of the gap between cylinders results in higher mechanical energy consumption per unit of processed starch slurry.
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EN
In this paper starch gelatinisation in Couette-Taylor flow (CTF) apparatus (equipped with a water heat jacket) has been investigated. CTF (characterised by the presence of Taylor vortices) provides good environment for gelatinisation, e.g. effective mixing, fast heat transfer, positive influence on starch rheological properties. During experiments starch gelatinisation degree and starch swelling has been studied. It was accompanied by temperature measurements performed along the apparatus. Additionally, starch gelatinisation was investigated by computer simulation. A complete starch gelatinisation was obtained for the shortest investigated residence time in the apparatus when the temperature in the heat jacket was above 85 [degrees]C. Nevertheless, it seems that it is still possible to reduce a residence time value, as well as, the value of Thj, but it may require some acceleration of rotor rotation. The swelling degree of gelatinised starch increased with growing values of residence time, rotor rotation and process temperature. Heat transferred could be affected by the structure of the Taylor vortex flow. No significant destruction of starch granules was observed during the treatment in Couette-Taylor flow apparatus. A quite satisfactory agreement between computer simulation and experiments results was achieved.
PL
W pracy przedstawiono wyniki pomiarów LDA wykonane dla przepływu jednokierunkowego (Taylora-Couette 'd) oraz przepływu dwukierunkowego (Couette'a-Poiseitille'a). Badania wykonano dla płynu nienewtonowskie-go (CMC). Wyniki badań eksperymentalnych opracowano w postaci profili prędkości składowej osiowej. Stwierdzono, że dla przepływu Couette'aPoiseuille 'a istotny wpływ na profil prędkości miał przepływ osiowy. Otrzymane profile prędkości były charakterystyczne dla przepływu laminarnego.
EN
The paper presents LDA results for one-directional Taylor-Couette flow and two-directional Couette-Poiseuille flow. All measurements were carried out for non-Newtonian fluid. Experimental results were visualized in a form of axial velocity profiles. It was concluded that axial flow strongly influenced velocity profiles of Couette-Poiseuille flow. Obtained velocity profiles were typical for laminar flow.
PL
W pracy przedstawiono wyniki symulacji numerycznych CFD dla przepływu Couctle'a-Taylora. Symulacje numeryczne wykonano dla jednofazowego przepływu płynu newtonowskiego (wody) przez trójwymiarową geometrię dwóch współosiowych walców. Wyniki symulacji CFD przedstawiono w postaci map i profili prędkości.
EN
The results of CFD simulation for the Couette-Taylor flow are presented in the paper. The 3D numerical simulations of one-phase flow of Newtonian fluid (water) were carried out. In the work the flow through two coaxial cylinders was considered. Final results were presented in a form of velocity maps and profiles.
EN
The objective of this work was investigation of the hydrodynamics of the flow in Couette-Taylor flow (CTF) in the liquid-liquid system using the computational fluid dynamics software Fluent 6. Characteristic parameters for CTF such as the length of the Taylor vortex pair, axial translation velocity of the vortices and the Kolmogoroff micro-scale were estimated.
PL
Dokonano numerycznej symulacji hydrodynamiki dwufazowego przepływu Couette'a-Taylora w układzie ciecz-ciecz. W badaniach użyto pakietu obliczeniowego Fluent 6. Wyznaczono parametry charakterystyczne dla przepływu Couette.a-Taylora, takie jak: długość pary wirów Taylora, prędkość przepływu osiowego wirów oraz skalę Kołmogorowa w fazie ciągłej.
EN
The study presents a method for emulsion preparation in the liquid - liquid contactor in conditions of Couette-Taylor flow (CTF). Stable 0/W emulsions with a quite narrow drop size distribution have been prepared. Emulsions tested can be used as an alternative diesel fuel of improved engine performance and emission characteristics.
EN
Hydrodynamics of two-phase gas - liquid and liquid - liquid helicoidal flow has been presented. Experimental and numerical study of such flow was carried out.
PL
Przedstawiono wyniki pomiarów mocy dyssypowanej ruchu obrotowego w dwufazowym przepływie Couette'a-Taylora dla układu ciecz-ciecz oraz struktury charakterystyczne dla takiego przepływu. Zaproponowano mapę reżimów przepływu. Obserwowane struktury przepływu sklasyfikowano w zależności od ułamka objętościowego fazy olejowej i zapotrzebowania na moc rotora.
EN
The measurements of the rotor power input were presented. Typical flow structures of liquid-liquid horizontal Couette-Taylor flow were described. The maps of the flow regime were presented. The observed regime was classified according to power input (connected with the rotor rotation) and volume fraction of silicone liquid.
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