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Wyszukujesz frazę "hold-up" wg kryterium: Temat

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Gas hold-up analysis in an unsteady stirred vessel by means of infinite series
    Autorzy:
    Frankiewicz, Sebastian S.
    Woziwodzki, Szymon
    Powiązania:
    https://bibliotekanauki.pl/articles/27315623.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    unsteady mixing
    gas hold-up
    non-coalescing system
    stirred vessel
    Opis:
    The use of a liquid level sensor made it possible to measure changes in gas hold-up over time in a stirred tank during unsteady mixing. These results were subjected to Fourier time series analysis and a model of gas hold-up changes in time was proposed. It allowed one to determine the model value of gas hold-up, which can be useful for characterizing gas hold-up during unsteady mixing and as a comparison to gas hold-up during steady mixing. The characteristic frequency was also determined, which corresponds to about twice the oscillation frequency. Model gas hold-up values for coalescing and non-coalescing systems were compared. Moreover, the change of the gas hold-up at constant maximum stirrer rotation frequency and variable gas flow rate for different oscillation frequencies was investigated.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 2; 30--35
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of air-to-pulp ratio and bias factor on flotation of complex cu-zn sulphide ore in the Jameson cell
    Autorzy:
    Gursoy, Y. H.
    Oteyaka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/110799.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    air-to-pulp ratio
    bias factor
    Jameson cell
    flotation
    hold-up
    Opis:
    The air-to-pulp ratio and bias factor are important operating parameters in the Jameson flotation cell. These parameters have significant effect on micro-events taking place between particles and bubbles in flotation, and hence on flotation performance. In this study, the possibilities of obtaining a Cu-Zn rich bulk concentrate from complex sulphide ore from the Cayeli region (Turkey) were investigated using the lab-scale Jameson cell. The effect of air-to-pulp ratio and bias factor on flotation recovery were also studied. The ore has problematic flotation behaviour due to very fine liberation size and oxidation. The results showed that the Cu-Zn rich bulk concentrate can be obtained from the ore with satisfactory grade and recovery. It was determined that the air-to-pulp ratio and bias factor have significant effect on the flotation recovery. The optimum values of air-to-pulp ratio and bias factor in flotation of rather fine sized minerals were determined to be within the range of 1-1.5 and 0.70-0.95, respectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 511-519
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrodynamics of Pilot Plant Scale Airlift Reactor in Presence of Alcohols
    Autorzy:
    Nandi, S.
    Jaju, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779781.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    air-lift reactor
    hydrodynamics
    gas hold-up
    bubble
    multiphase flow
    surfactant
    Opis:
    The overall gas hold-up of a pilot plant scale internal loop airlift reactor was studied in presence of different alcohols in varied concentration. It has been observed that these simple alcohols can enhance overall gas hold-up of the airlift assembly possibly due to formation of protective thin layer over smaller gas bubbles thereby reducing chance of their coalescence. As the alcohols can be used as food source for the micro organisms present in the system, this green and environment friendly process have potential to replace usage of hazardous surfactants often used for enhancing overall hold-up in order to obtain desired mass transfer characteristics. An empirical relationship encompassing overall gas hold-up of the reactor as a function of superficial gas velocity and alcohol concentration is also developed.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 118-123
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of vessel scale on gas hold-up in gas-liquid systems
    Autorzy:
    Cudak, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/2034059.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    agitated vessel
    mixing
    gas hold-up
    aqueous sucrose solution
    mieszanie
    zatrzymywanie gazu
    wodny roztwór sacharozy
    Opis:
    The aim of the research presented in this paper was to determine the effect of vessel scale on gas hold- up in gas-liquid systems. The agitated vessel with internal diameters of T = 0:288 m and T = 0:634 m was filled with a liquid up to the height H = T. For the purpose of measurements, two high-speed impellers were used: Rushton turbine impeller (RT) or A 315 impeller.Within the study, the following parameters were altered: superficial gas velocity, impeller speed, impeller type and concentration of aqueous sucrose solution. In addition, influence of the vessel scale on gas hold-up value was analysed. Experimental results were mathematically described. Equations (5)–(7) do not have equivalents in the literature.
    Źródło:
    Chemical and Process Engineering; 2020, 41, 4; 241-256
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrodynamic characteristics of mechanically agitated air - aqueous sucrose solutions
    Autorzy:
    Cudak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185518.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    agitated vessel
    aqueous solutions of sucrose
    gas hold-up
    power consumption
    mieszalnik
    wodny roztwór sacharozy
    pobór mocy
    Opis:
    The aim of the research presented in this paper was determination of power consumption and gas hold-up in mechanically agitated aerated aqueous low concentration sucrose solutions. Experimental studies were conducted in a vessel of diameter 0.634 m equipped with high-speed impellers (Rushton turbine, Smith turbine or A 315). The following operating parameters were changed: volumetric gas flow rate (expressed by superficial gas velocity), impeller speed, sucrose concentration and type of impeller. Based on the experiments results, impellers with a modified shape of blades, e.g. CD 6 or A 315, could be recommended for such gas-liquid systems. Power consumption was measured using strain gauge method. The results of gas holdup measurements have been approximated by an empirical relationship containing dimensionless numbers (Eq. (2)).
    Źródło:
    Chemical and Process Engineering; 2014, 35, 1; 97-107
    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
    Tytuł:
    Agitation efficiency of different physical systems
    Autorzy:
    Karcz, Joanna
    Szoplik, Jolanta
    Major-Godlewska, Marta
    Cudak, Magdalena
    Kiełbus-Rąpała, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2086781.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    agitated vessel
    power consumption
    mixing time
    heat and mass transfer
    gas hold-up
    wzburzony statek
    pobór energii
    czas mieszania
    wymiana ciepła i masy
    zatrzymywanie gazu
    Opis:
    Efficiency of agitation was considered for different physical systems on the basis of our own experimental studies on homogenisation, heat and mass transfer as well as gas hold-up. Measurements were performed for different physical systems: Newtonian liquids of low and higher viscosity, pseudoplastic liquid, gas–liquid and gas–solid–liquid systems agitated in vessels of the working volume from 0.02 m3 to 0.2 m3. Agitated vessels of different design were equipped with a high-speed impeller (10 impellers were tested). Comparative analysis of the experimental results proved that energy inputs (power consumption) should be taken into account as a very important factor when agitation efficiency is evaluated in order to select a proper type of equipment. When this factor is neglected in the analysis, intensification of the process can be estimated only.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 2; 139--156
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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