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1
Content available Thermal treatment of starch slurry in Couette-Taylor flow apparatus
Hubacz R., Masuda H., Horie T., Ohmura N.
Chemical and Process Engineering
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2017
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Vol. 38, nr 3
345--361
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.
2
Content available Starch gelatinisation in Couette-Taylor flow apparatus
Hubacz R., Buczyńska M.
Chemical and Process Engineering
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2011
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Vol. 32, nr 4
267-279
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.
3
Content available Starch gelatinization and hydrolysis in the apparatus with Couette-Taylor flow
Hubacz R., Ohmura N., Wroński S.
Inżynieria i Aparatura Chemiczna
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2010
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Nr 2
55-56
4
Content available Wizualizacja przepływu Couette'a-Taylora dla płynu newtonowskiego : zastosowanie metody CFD
Peryt-Stawiarska S., Tomkiel I.
Inżynieria i Aparatura Chemiczna
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2009
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Nr 3
158-160
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.
5
Content available remote Numerical simulation of hydrodynamics of a Coquette-Taylor contactor in two-phase liquid-liquid systems
Hubacz R.
Chemical and Process Engineering
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2007
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Vol. 28, z. 3
639-647
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.
6
Preparation of water fuel emulsions in a liquid - liquid Couette-Taylor flow contactor
Dłuska E., Hubacz R., Wroński S., Kamieński J., Dyląg M., Wójtowicz R.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 6s
50-53
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.
7
Hydrodynamika w aparacie z dwufazowym przepływem helikoidalnym
Hubacz R., Woliński J., Sujka K., Wroński S.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 6s
92-93
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.
8
Określenie obszarów dwufazowego przepływu helikoidalnego
Hubacz R., Wroński S.
Inżynieria Chemiczna i Procesowa
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2001
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T. 22, z. 3C
543--548
PL
Przedstawiono wstępne badania nad strukturą helikoidalnego przepływu dwufazowego. Zaproponowana została mapa reżimów przepływów.
EN
The preliminary research under structure of two-phase Couette-Taylor flow has been presented. The map of the flow patterns has been proposed.
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