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    Wyświetlanie 1-14 z 14
    Tytuł:
    Effect of impeller shape on solid particle suspension
    Autorzy:
    Rieger, F.
    Jirout, T.
    Ceres, D.
    Seichter, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185746.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixing
    axial impeller
    hydrofoil impeller
    just-suspended impeller speed
    electrochemical metod
    mieszanie
    wirnik osiowy
    prędkość wirnika
    metoda elektrochemiczna
    Opis:
    This paper deals with the effect of impeller shape on off-bottom particle suspension. On the basis of numerous suspension measurements, correlations are proposed for calculating the just-suspended impeller speed for a standard pitched four-blade turbine and three types of hydrofoil impellers produced by TECHMIX for several particle sizes and for a wide range of particle concentrations. The suspension efficiency of the tested impellers is compared with the efficiency of a standard pitched blade turbine on the basis of the power consumption required for off-bottom suspension of solid particles. It is shown that the standard pitched blade turbine needs highest power consumption, i.e. it exhibits less efficiency for particle suspension than hydrofoil impellers produced by TECHMIX.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 139-152
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study on blending characteristics of axial flow impellers
    Autorzy:
    Fort, I.
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185615.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wirnik osiowy
    wirnik tarczowy
    przepływ burzliwy
    axial flow impeller
    pitched-blade impeller
    turbulent flow
    impeller power input
    blending time
    Opis:
    This paper presents an analysis of the blending characteristics of axial flow high-speed impellers under a turbulent regime of flow of an agitated low viscosity liquid. The conductivity method is used to determine the time course of blending (homogenisation) of miscible liquids in a pilot plant fully baffled mixing vessel, and a torquemeter is used for measuring the impeller power input in the same system. Four-blade and six-blade pitched blade impellers and three high efficiency axial flow impellers are tested for the given degree of homogeneity (98%). The experimental results and also the results of the authors' previous study, in accordance with the theoretical approach described in the literature, show that there is a universal relationship between the impeller power number and the dimensionless blending time, taking into consideration the impeller-to-vessel diameter ratio, independent of the geometry of the axial flow impeller but dependent on the degree of homogeneity. This relationship is found to be valid on a pilot plant scale under a turbulent flow regime of an agitated liquid.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 311-319
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pumping capacity of pitched blade multi – stage impellers
    Autorzy:
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185756.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pitched blade impeller
    multi-stage impeller
    impeller pumping capacity
    velocity
    profile
    laser Doppler anemometry
    wirnik wielostopniowy
    wydajność pompowania wirnika
    prędkość
    profil
    laser Dopplera
    Opis:
    This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity and flow in the mixing bath in comparison with an independently operating pitched blade impeller with the same geometry. In case of a relatively close distance between Impellers H3/d= 0.5 - 0.75, the multi-stage impeller creates only one circulation loop and the impellers itself behave identically as pumps in series. However for relative higher distance of impellers than H3/d= 1.25, the multi-stage impeller creates two separated circulation loops.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 1; 47-53
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Blending characteristics of high-speed rotary impellers
    Autorzy:
    Fořt, I.
    Seichter, P.
    Pešl, L.
    Rieger, F.
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185151.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-speed rotary impeller
    turbulent flow
    impeller power input
    blending time
    impeller blending efficiency
    wirnik obrotowy dużych prędkości
    przepływ turbulentny
    pobór mocy wirnika
    czas mieszania
    efektywność mieszania wirnikiem
    Opis:
    This paper presents a comparison of the blending efficiency of eight high-speed rotary impellers in a fully baffled cylindrical vessel under the turbulent flow regime of agitated charge. Results of carried out experiments (blending time and impeller power input) confirm that the down pumping axial flow impellers exhibit better blending efficiency than the high-speed rotary impellers with prevailing radial discharge flow. It follows from presented remsults that, especially for large scale industrial mrealisations, the axial flow impellers with profiled blades bring maximum energy savings in mcomparison with the standard impellers with inclined flat blades (pitched blade impellers).
    Źródło:
    Chemical and Process Engineering; 2013, 34, 4; 427-434
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comments on Flow characteristics of axial high speed impellers
    Autorzy:
    Joshi, J.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/185547.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    charakterystyka przepływowa
    wirnik osiowy
    flow characteristics
    axial impeller
    Opis:
    Fort et al. (2010) have written another useful article on flow characteristics generated by axial high speed impellers. I agree with the authors that the knowledge of flow patterns is crucial for developing reliable design procedures for instance, for mixing and blending (Baldyga and Bourne, 1997; Nienow, 1997; Ranade et al., 1991), for solid suspension (Raghva Rao et al., 1988; Zwietering, 1958), for gas induction (Joshi and Sharma, 1977) and bioreactions where controlled shear is important (Joshi et al., 1996). With this context, the work of Fort et al. (2010) needs some clarification and further extension.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 2; 311-315
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Replay to Comments on Flow characteristics of axial high speed impellers
    Autorzy:
    Fort, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/185464.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    charakterystyka przepływowa
    wirnik osiowy
    flow characteristics
    axial impeller
    Opis:
    The comments made by Professor Joshi are a most welcome addition to the findings presented by us (Fort et al., 2010). We agree that many valuable studies in the past dealt with experimental investigation of turbulent velocity field in stirred systems with axial high-speed impellers. Therefore it would be highly desirable to present a comprehensive comparison of the efficiency of various types of impellers, especially for their optimum design for processes in chemical and biochemical industries. Nevertheless in such a comparison it should be taken to consideration the quality and reliability of experimental data, because both chosen experimental techniques and selected independent variables (position of impeller, viscosity and density of agitated liquid, etc.) have to be well defined and comparable in all investigated stirred systems.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 2; 317-318
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of CFD simulations of the flow pattern in an agitated system with a pitched blade worn turbine
    Autorzy:
    Skocilas, J.
    Fort, I.
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185244.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pitched blade impeller
    erosion wear
    ensemble-average mean velocity
    impeller
    pumping capacity
    CFD simulation
    prędkość uśredniona
    wirnik
    wydajność pompy
    symulacji CFD
    Opis:
    This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (= 45[degrees] and 30[degrees]) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors’ previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 39-49
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller
    Autorzy:
    Ameur, H.
    Bouzit, M.
    Helmaoui, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185604.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wirnik Scaba
    numeryczne badania 3D
    przepływ nienewtonowski
    3D numerical study
    non-Newtonian fluid
    stirred vessel
    Scaba impeller
    impeller eccentricity
    Opis:
    The present work deals with agitation of non-Newtonian fluids in a stirred vessel by Scaba impellers. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterise at every point flow patterns especially in the region swept by the impeller. A shear thinning fluid with yield stress was modelled. The influence of agitator speed, impeller location and blade size on the fluid flow and power consumption was investigated. The results obtained are compared with available experimental data and a good agreement is observed. It was found that an increase in blade size is beneficial to enlargement of the well stirred region, but that results in an increased power consumption. A short distance between the impeller and the tank walls limits the flow around the agitator and yields higher power consumption. Thus, the precise middle of the tank is the most appropriate position for this kind of impeller.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 351-366
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous velocity measurement of phases in a liquid-gas system
    Autorzy:
    Musoski, R.
    Stelmach, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185238.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluorescence
    self-aspirating impeller
    phase velocity
    PIV
    fluorescencja
    samozasysający wirnik
    prędkość fazowa
    Opis:
    Results of velocity measurements of liquid and gas bubbles in a tank with a self-aspirating disk impeller are analysed. Studies were carried out using a fluorescent dye tracer in the measuring system with two cameras (simultaneous phase velocity measurement) and with one camera (sequential measurement of phase velocity). Based on a comparative analysis of the acquired data it was found that when differences in the phase velocities were small the simultaneous velocity measurement gave good results. However, sequential measurement gives greater possibilities for setting the measuring system and if the analysis of instantaneous velocities is not necessary, it seems to be a better solution.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 4; 577-585
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of liquid blending dynamics with Maxblend impellers by Electrical Resistance Tomography
    Autorzy:
    Iwasawa, Suzuka
    Kubo, Honami
    Takenaka, Katsuhide
    Pintus, Sandro
    Maluta, Francesco
    Montante, Giuseppina
    Paglianti, Alessandro
    Powiązania:
    https://bibliotekanauki.pl/articles/2086792.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    maxblend impeller
    mixing time
    electrical resistance tomography
    stirred tank
    wirnik
    czas mieszania
    tomografia oporności elektrycznej
    Opis:
    The aim of the investigation was liquid mixing time measurement in a laboratory scale stirred tank equipped with a metal Maxblend impeller and comparison with the corresponding mixing time obtained with other conventional impellers. The data are collected by Electrical Resistance Tomography, whose applicability in this case is non-trivial, because of the electrical interferences between the large paddles of the impeller and the measuring system. The raw data treatment methodology purposely developed for obtaining the homogenization dynamics curve is presented. A robust approach for a fine and low cost investigation of the mixing performances of close-clearance impellers in opaque systems is suggested. The analysis of the local and averaged conductivity time traces reveals the effect of important variables, such as the fluid viscosity and the vessel configuration, on the mixing time under various agitation conditions. The data collection and post processing procedures open the way to the application of the technique to multiphase and non-Newtonian fluids stirred with close-clearance impellers.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 3; 197--207
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling particle deagglomeration in a batch homogenizer using full CFD and mechanistic models
    Autorzy:
    Krzosa, Radosław
    Wojtas, Krzysztof
    Golec, Jakub
    Makowski, Łukasz
    Orciuch, Wojciech
    Adamek, Radosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2034041.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    population balance
    titanium dioxide
    CFD
    breakup
    high shear impeller
    bilans populacji
    dwutlenek tytanu
    wirnik o wysokim ścinaniu
    Opis:
    Modelling of titanium dioxide deagglomeration in the mixing tank equipped with a high shear impeller is presented in this study. A combination of computational fluid dynamics with population balance was applied for prediction of the final particle size. Two approaches are presented to solve population balance equations. In the first one, a complete population balance breakage kinetics were implemented in the CFD code to simulate size changes in every numerical cell in the computational domain. The second approach uses flow field and properties of turbulence to construct a mechanistic model of suspension flow in the system. Such approach can be considered as an attractive alternative to CFD simulations, because it allows to greatly reduce time required to obtain the results, i.e., the final particle size distribution of the product. Based on experiments shattering breakage mechanism was identified. A comparison of the mechanistic model and full CFD does not deviate from each other. Therefore the application of a much faster mechanistic model has comparable accuracy with full CFD. The model of particle deagglomeration does not predict a very fast initial drop of particle size, observed in the experiment, but it can predict, with acceptable accuracy, the final particle size of the product.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 2; 105-118
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the mechanism of gas bubble break-up in liquids during the self-aspirating impeller operation
    Autorzy:
    Stelmach, J.
    Kuncewicz, Cz.
    Musoski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/185320.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    self-aspirating impeller
    PIV
    gas bubble size distribution
    energy dissipation rate
    gas bubble sizes
    pęcherzyk gazu
    rozpraszanie energii
    Opis:
    Feasibility of a model of gas bubble break-up and coalescence in an air-lift column enabling determination of bubble size distributions in a mixer with a self-aspirating impeller has been attempted in this paper. According to velocity measurements made by the PIV method with a self-aspirating impeller and Smagorinski’s model, the spatial distribution of turbulent energy dissipation rate close to the impeller was determined. This allowed to positively verify the dependence of gas bubble velocity used in the model, in relation to turbulent energy dissipation rate. Furthermore, the range of the eddy sizes capable of breaking up the gas bubbles was determined. The verified model was found to be greatly useful, but because of the simplifying assumptions some discrepancies of experimental and model results were observed.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 3; 441-457
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of models of gas bubble break-up causedby eddies generated by a self-aspirating disk impeller
    Autorzy:
    Stelmach, Jacek
    Musowski, Radosław
    Powiązania:
    https://bibliotekanauki.pl/articles/185375.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    self-aspirating disk impeller
    bubble break-up
    population balance model
    samozasysający wirnik tarczowy
    rozpad bańki
    model równowagi populacji
    Opis:
    The paper presents a photographic analysis of the break-up of gas bubbles flowing out of the outletsof a self-aspirating disk impeller. It was found that bubbles detached from the interfacial surface mostoften disintegrate to form several daughter bubbles. Further in the work, the population balance modelwas verified for several formulas describing the bubble break-up rate. It has been found that a good fitto the experimental data is provided by the formula given by Laakkonen for 5 daughter bubbles. Thepossibility of using the Monte Carlo method to model the bubble break-up process was also determined.For this method, a good agreement of results was achieved for the division into a maximum of 10daughter bubbles. In the case of this method it was also found necessary to use the function of break-upfrequency at a higher rate for smaller bubbles.
    Źródło:
    Chemical and Process Engineering; 2020, 41, 1; 45--57
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of different factors on momentum transfer in mechanically agitated multiphase systems
    Autorzy:
    Cudak, M.
    Kiełbus-Rąpała, A.
    Major-Godlewska, M.
    Karcz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185715.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiphase system
    agitated vessel
    critical impeller speed
    gas hold-up power
    consumption
    układ wielofazowy mieszalnika
    krytyczne prędkości wirnika
    konsumpcja
    Opis:
    A comparative analysis concerning the influence of different factors on momentum transfer in mechanically agitated systems was carried out on the basis of experimental results for solid-liquid, gas-liquid and gas-solid-liquid systems. The effects of the impeller - baffles system geometry, scale of the agitated vessel, type and number of impellers and their off-bottom clearance, as well as physical properties of the multiphase systems on the critical impeller speeds needed to produce suspension or dispersion, power consumption and gas hold-up were analysed and evaluated.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 1; 41-53
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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