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    Wyświetlanie 1-3 z 3
    Tytuł:
    Transient CFD simulations of turbulent liquid - liquid flow in a Kenics static mixer. Radial and tangential velocities
    Autorzy:
    Murasiewicz, H.
    Jaworski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/779172.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    LES
    ciecz-ciecz
    przepływ burzliwy
    mieszalnik Kenics
    liquid-liquid
    turbulent flow
    Kenics mixer
    Opis:
    The results of modelling of the two-phase turbulent flow of a two-phase, liquid-liquid mixture in a Kenics static mixer were reported. Advanced transient simulations were performed using the large eddy simulation (LES) approach and a broader analysis of the velocity field was carried out. The two-phase flow was modelled employing the Eulerian approach in the pseudo-homogeneous version of the mixture model. Three cases were again considered, which differed by the density of the two phases and the simulations were performed for Reynolds number of 10,000. The LES results for the tangential and radial components were compared with those obtained in the steady-state RANS approach.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 2; 36-40
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD modelling of two-phase liquid-liquid flow in a SMX static mixer
    Autorzy:
    Pianko-Oprych, P.
    Jaworski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/778737.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    CFD
    LES
    QMOM
    przepływ dwufazowy
    dyspersja ciecz-ciecz
    mieszalnik statyczny SMX
    two-phase flow
    liquid-liquid dispersion
    SMX static mixer
    Opis:
    The paper provides an overview of the application of Computational Fluid Dynamics tools for predicting transport processes in two-phase flow in a SMX static mixer. The overview is achieved by taking a brief look at factors: mesh generation, development of sub-models, post-processing including validation and quantitative verification of CFD results with experimental data. Two types of numerical approach were used in the simulations: the Reynolds averaged Navier-Stokes in the steady-state mode with the standard k-??turbulence model and Large Eddy Simulations in the unsteady mode. Both CFD techniques were applied to calculate flow velocities, pressure drop and homogenisation level in a SMX static mixer of the liquid-liquid mixture. The steady state drop size distribution was obtained by implementation procedure containing the population balance equation, where transport equations for the moments of the drop size distribution are solved and the closure problem is overcome by using the Quadrature Method of Moments.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 3; 41-49
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization the operation parameters of SDA desulfurization tower by flow coupling chemical reaction model
    Autorzy:
    Mei, Dan
    Shi, Junjie
    Zhu, Yuzheng
    Xu, Xuemei
    Xing, Futang
    Shi, Ling
    Powiązania:
    https://bibliotekanauki.pl/articles/778336.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    spray drying absorber tower
    gas-liquid two-phase flow
    droplet diameter
    desulfurization efficiency
    amount of scaling
    Opis:
    Spray Drying Absorber (SDA) has been widely used for large-scale desulfurization. However, it also has some limitations. For example, the liquid absorbent easily causes scaling, which impedes the contact between the serous fluid and the flue gas and reduces the chemical reaction rate and desulfurization efficiency. This paper establishes the mathematical and physical model of gas and liquid two-phase flow and droplet evaporation and heat transfer in rotary spray desulfurization tower. To study the accumulation and distribution of chemical reaction precipitates in the desulfurization tower and analyze the removal efficiency of sulfur dioxide (SO2) in different atomization diameters, this paper establishes a simulation model concerning the coupling of desulfurization reaction and flow field calculation based on the absorption and reaction mechanism of SO2. Baffle in different widths are set to optimize the internal floweld and balance the distribution of flue gas. By setting baffles of different widths to optimize the flow feld in the tower and changing the distribution of flue gas, this model reduces the scaling while ensuring the desulfurization efficiency. The results of the simulation experiment have verified that the droplet with a diameter of 50 μm is the optimal option, which can effectively remove the scaling and ensure that the desulfurizing tower runs in high efficiency and stability. When the width of baffes is 2250 mm, the efficiency of desulfurization exceeds 95%, and the amount of scaling on the desulfurization tower main wall is controlled at the minimum level, which is the optimal option for production.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 1; 35-45
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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