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Wyszukujesz frazę "fluctuation velocity" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Study of the turbulent flow structure around a standard Rushton impeller
    Autorzy:
    Kysela, B.
    Konfršt, J.
    Fořt, I.
    Kotek, M.
    Chára, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/184917.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Rushton turbine
    mixing, ensemble-average mean velocity
    fluctuation velocity
    LDA/LDV
    PIV
    velocity profiles
    turbina Rushtona
    mieszanie
    wahanie prędkości
    PRA / LDV
    profil prędkości
    Opis:
    The velocity field around the standard Rushton turbine was investigated by the Laser Doppler Anemometry (LDA) and Particle Image Velocime try (PIV) measurements. The mean ensemble-averaged velocity profiles and root mean square values of fluctuations were evaluated at two different regions. The first one was in the discharge stream in the radial direction from the impeller where the radial flow is dominant and it is commonly modelled as a swirling turbulent jet. The validity range of the turbulent jet model was studied. The second evaluated region is under the impeller where flow seems to be at first sight rather rigorous but obtained results show nonnegligible values of fluctuation velocity.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 1; 137-147
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of flow structure and performance of the centrifugal compressor impeller
    Autorzy:
    Grzelczak, M.
    Tralewski, A.
    Pałucki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/175160.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    centrifugal compressors
    cross-section of the rotor
    velocity fluctuation
    tangential/meridional velocity
    comppressor impellers
    Opis:
    The presently applied desulfurization technologies require a supply of air through centrifugal compressors realizing the pressure increment on the level of 150–200 kPa. Taking the necessary mass flow rate of the processed air into account it is necessary to increase the efficiency of the compression process realized in these machines. The paper will include the results of the works related to the analysis of the gas flow in the compression stage operating with two impellers. The first one has been described with a mathematical function preserving the condition of ruled surface and the geometry of the other impeller has been modeled according to the shape of the meridional velocity profile in the inlet section thus forming leading edge. The common feature of both impellers is the same mathematical function that describes the meridional section and the profile of the blade. The outer diameter of each of the impellers is 200 mm and the blade angle in the outlet section 45◦. The compression stage reaches the pressure ratio of 1.4 at the nominal mass flow of 0.73 kg/s maintaining the impeller rotational speed on the level of 24 400 rpm. For the evaluation of the operating parameters and the nature of the gas flow in the compression stage operating with two impellers computational fluid dynamics simulations were carried out and experimental research has been performed using laser Doppler anemometry for impeller of ruled surface.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 132; 87-101
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Turbulent Energy Dissipation Rate in a Vessel Agitated by a Rushton Turbine
    Autorzy:
    Šulc, R.
    Pešava, V.
    Ditl, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185567.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixing
    Rushton turbine
    local turbulent energy dissipation rate
    energy spectrum
    function
    fluctuation velocity
    mieszanie
    turbina Rushtona
    rozpraszanie energii
    widmo energii
    prędkość wahania
    Opis:
    The scaling of turbulence characteristics such as turbulent fluctuation velocity, turbulent kinetic energy and turbulent energy dissipation rate was investigated in a mechanically agitated vessel 300 mm in inner diameter stirred by a Rushton turbine at high Reynolds numbers in the range 50 000 < Re < 100 000. The hydrodynamics and flow field was measured using 2-D TR PIV. The convective velocity formulas proposed by Antonia et al. (1980) and Van Doorn (1981) were tested. The turbulent energy dissipation rate estimated independently in both radial and axial directions using the one-dimensional approach was not found to be the same in each direction. Using the proposed correction, the values in both directions were found to be close to each other. The relation /(N3·D2) const. was not conclusively confirmed.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 2; 135-149
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the results for calculation of vortex currents after sudden expansion of the pipe with different diameters
    Autorzy:
    Kholboev, B. M.
    Navruzov, D. P.
    Asrakulova, D. S.
    Engalicheva, N. R.
    Turemuratova, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174200.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fluktuacja prędkości
    prąd wirowy
    anizotropia turbulencji
    two-fluid turbulence model
    sudden expansion
    velocity fluctuation
    intensity of fluctuations
    gas resistance
    quasi-periodic regime
    Opis:
    In this work, a numerical study of a sharply expanding highly swirling flow is carried out using v2-f models based on the Comsol Multiphysics 5.6 software package and a two-fluid turbulence model. The results obtained are compared with known experimental data with different pipe diameters. The purpose of this work is to test the ability of models to describe anisotropic turbulence. It is shown that the two-fluid model is more suitable for studying such flows.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 115--123
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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