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Wyszukujesz frazę "particle flow" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    A study on polymer particle flow in a disk zone of a screw - disk extruder
    Autorzy:
    Rydzkowski, T.
    Michalska-Pożoga, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/185830.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    extrusion
    screw disk extrusion
    flow trajectory of particle
    wytłaczanie
    trajektoria przepływu cząstek
    Opis:
    The paper presents the summary of research on polymer melt particle motion trajectories in a disc zone of a screw-disk extruder. We analysed two models of its structure, different in levels of taken simplifications. The analysis includes computer simulations of material particle flow and results of experimental tests to determine the properties of the resultant extrudate. Analysis of the results shows that the motion of melt in the disk zone of a screw-disk extruder is a superposition of pressure and dragged streams. The observed trajectories of polymer particles and relations of mechanical properties and elongation of the molecular chain proved the presence of a stretching effect on polymer molecular chains.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 1; 121-135
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the sedimentation process using flow visualization methods
    Autorzy:
    Suchecki, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/185147.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sedimentation dynamics curve
    flow visualization
    particle image velocimetry
    krzywa dynamiki sedymentacji
    wizualizacja przepływu
    Opis:
    The aim of the paper was to develop determination methods of sedimentation characteristics using PIV image anemometry and suspension image analysis. Two methods of the investigation of sed- imentation process based on visualization techniques were developed. In the first one, using PIV method, vector fields of the velocity of settling particles are determined and then average particle velocities are calculated to establish the so called sedimentation dynamics curve. In the second one, the methods of suspension image analysis are utilized to determine the positions of the upper dis- continuity and to establish the sedimentation curve. Laboratory research on the sedimentation of agalit particles suspended in glycerine was conducted (using PIV method). Additionally, industrial research on the sedimentation of water-absorbing granular material used after the first carbonation (carbonation I) was conducted in a sugar factory (using the second method). The research consisted of photographic registration of images of the settling suspension by means of the time-lapse photog- raphy technique. A laboratory study was conducted for four values of the volume concentration of agalit particles in glycerine (0.5; 1.0; 1.5 and 2.0 vol%). The research methodology, the scope of the conducted measurements and sample research results together with conclusions are presented in this paper.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 2; 223--233
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of wake structures in bubbly flowsusing Particle Image Velocimetry (PIV)
    Autorzy:
    Lewandowski, Björn
    Fertig, Micha
    Krekel, Georg
    Ulbricht, Mathias
    Powiązania:
    https://bibliotekanauki.pl/articles/952673.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bubbly flow
    Particle Image Velocimetry
    wake analysis
    flowcharacteristics
    high-speedimaging
    przepływ
    cząstki
    analiza
    charakterystyka przepływu
    Opis:
    The flow structure around rising single air bubbles in water and their characteristics, such as equivalentdiameter, rising velocity and shape, was investigated using Particle Image Velocimetry (PIV) and Shadowgraphy in a transparent apparatus with a volume of 120mL. The effect of different volumetricgas flow rates, ranging from 4μL/min to 2 mL/min on the liquid velocity was studied. Ellipsoidalbubbles were observed with a rising velocity of 0.25–0.29 m/s. It was found that a Kármán vortex streetexisted behind the rising bubbles. Furthermore, the wake region expanded with increasing volumetricgas flow rate as well as the number and size of the vortices.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 1; 49-55
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling the dynamics of flexible and rigid fibres
    Autorzy:
    Kondora, G.
    Asendrych, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/185311.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fibre dynamics
    fibre orientation
    Lagrange method
    particle-level simulation
    headbox flow
    dynamika włókien
    orientacja włókien
    metoda Lagrange'a
    symulacja na poziomie cząstek
    Opis:
    A particle-level simulation technique has been developed for modelling fibre suspension flow in a converging channel of a papermachine headbox. The fibre model is represented by a chain of elements connected together. The model was verified by the simulation of rigid fibre dynamics in a simple shear flow. The period of rotation was found to be in a very good agreement with theory and reference data. The model was then employed to simulate fibre motion in a converging channel of a papermachine headbox. Fibre suspension motion was resolved using two-step procedure. Velocity field was calculated by means of a commercial CFD code ANSYS Fluent with RSM turbulence model applied and used as an input to the in-house code allowing to simulate fibre dynamics. Results of the calculations were used to construct the fibre orientation probability distribution (FOPD) which was found to be consistent with available experimental data.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 87-100
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the liquid flow in a vessel with a rotating disk at the liquid surface
    Autorzy:
    Suchecki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/184934.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    liquid flow
    rotating disk
    von Kármán’s equations
    velocity field
    digital particle image
    velocimetry
    przepływ cieczy
    dysk obrotowy
    równanie von Karmana
    pole prędkości
    Opis:
    This study is concerned with liquid flow induced by a disk which rotates steadily around its axis and touches the free surface of liquid contained in a cylindrical vessel. It is a simplified model of the flow in the inlet part of a vertical cooling crystallizer where a rotary distributor of inflowing solution is situated above the free surface of solution contained in the crystalliser. Numerical simulations of flow phenomena were conducted and the simulation results were interpreted assuming an analogy with Kármán’s theoretical equations. In a cylindrical coordinate system, the components of flow velocity were identified as functions of distance from the surface of the rotating disk. The experimental setup was developed to measure velocity fields, using digital particle velocimetry and optical flow. Conclusions concerning the influence of disc rotation on liquid velocity fields were presented and the experimental results were found to confirm the results of numerical simulation. On the basis of simulation data, an approximation function was determined to describe the relationship between the circumferential component of flow velocity and the distance from the disk.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 1; 3-18
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential design improvements of a reverse flow mini-cyclone with a tangential inlet
    Autorzy:
    Dziubak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185760.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air filter
    mini-cyclones
    separation efficiency
    separation performance
    flow resistance
    dust particle size distribution
    filtr powietrza
    minikomocyklony
    skuteczność separacji
    wydajność separacji
    opór przepływu
    rozkład wielkości cząstek pyłu
    Opis:
    This paper presents an effect of general dimensions of a reverse flow mini-cyclone with a tangential inlet on its separation efficiency. Several mini-cyclone design modifications are presented and evaluated for use in the air filtration systems of motor vehicles. Local design improvements of three components of a reverse flow mini-cyclone with a tangential inlet D-40 of an air filter fitted in an all-terrain vehicle engine were introduced. An asymmetric curvilinear shape of an outlet port was used instead of a symmetrical shape. An outlet vortex finder inlet port shape was streamlined, and a cylindrical outlet vortex finder of the cyclone was replaced with a conical one. Experimental evaluation of the effects of the design improvements of mini-cyclone on its separation efficiency and performance as well as flow resistance was carried out. Separation efficiency of the cyclone was determined using the mass method as a product of dust mass retained by the mini-cyclone and supplied to the mini-cyclone in a specified time. Separation performance of the cyclone was determined as the largest dust particle dz =dzmax in a specific test cycle in the cyclone outlet air stream. A polydisperse PTC-D test dust used in Poland, a substitute for AC-fine test dust was used. Dust concentration at the mini-cyclone inlet was kept at 1 g/m3. The size and total number of dust particles in the air stream at the outlet of the original mini-cyclone and at the outlet of the improved mini-cyclone was determined using a particle counter.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 1; 15--31
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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