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Wyszukujesz frazę "turbulent mixing" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Analysis of kinetics of multicomponent, heterogeneous granular mixtures – Laminar and turbulent flow approach
Autorzy:
Królczyk, J. B.
Powiązania:
https://bibliotekanauki.pl/articles/184979.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mixing
granular materials
kinetics
turbulent stage
laminar stage
mieszanie
materiał sypki
kinetyka
etap burzliwy
etap laminarny
Opis:
Mixing of granular materials is unquestionably important. Mixing solids is common in industrial applications and frequently represents a critical stage of the processes. The effect of mixing determines the quality of the products. Achieving a gas or liquid mixture ideally homogeneous in terms of composition in the case of dissolving components is not that difficult, while in case of granular materials that usually differ in sizes and densities, obtaining a homogenous mixture is practically impossible. The aim of the paper is to present the kinetics of mixing of a multicomponent, nonhomogeneous granular mixture. For the first time in mixing of granular materials, a reference has been made to the terminology used in kinematics of fluid mixtures to determine the state of the mixture: turbulent or laminar. By means of statistical analysis the mixing process was divided into two stages. The initial phase of the process was called the stage of turbulent changes, due to large differences in the quality of the observed mixtures; the final step of the process was called the stage of laminar, stable changes, where further mixing did not result in a significant improvement in quality. The research was conducted in industrial conditions in a two-tonne mixer.
Źródło:
Chemical and Process Engineering; 2016, 37, 2; 161-173
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
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
    Wyświetlanie 1-2 z 2

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