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    Wyświetlanie 1-6 z 6
    Tytuł:
    Investigation of mixing time in liquid under influence of rotating magnetic field
    Autorzy:
    Przybył, A.
    Rakoczy, R.
    Konopacki, M.
    Kordas, K.
    Drozd, R.
    Fijałkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/185725.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rotating magnetic field
    mixing time
    hydrodynamics
    mixing effect
    obracanie pola magnetycznego
    czas mieszania
    hydrodynamika
    efekt mieszania
    Opis:
    The aim of the study was to present an experimental investigation of the influence of the RMF on mixing time. The obtained results suggest that the homogenization time for the tested experimental set-up depending on the frequency of the RMF can be worked out by means of the relationship between the dimensionless mixing time number and the Reynolds number. It was shown that the magnetic field can be applied successfully to mixing liquids.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 4; 555-565
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of liquid blending dynamics with Maxblend impellers by Electrical Resistance Tomography
    Autorzy:
    Iwasawa, Suzuka
    Kubo, Honami
    Takenaka, Katsuhide
    Pintus, Sandro
    Maluta, Francesco
    Montante, Giuseppina
    Paglianti, Alessandro
    Powiązania:
    https://bibliotekanauki.pl/articles/2086792.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    maxblend impeller
    mixing time
    electrical resistance tomography
    stirred tank
    wirnik
    czas mieszania
    tomografia oporności elektrycznej
    Opis:
    The aim of the investigation was liquid mixing time measurement in a laboratory scale stirred tank equipped with a metal Maxblend impeller and comparison with the corresponding mixing time obtained with other conventional impellers. The data are collected by Electrical Resistance Tomography, whose applicability in this case is non-trivial, because of the electrical interferences between the large paddles of the impeller and the measuring system. The raw data treatment methodology purposely developed for obtaining the homogenization dynamics curve is presented. A robust approach for a fine and low cost investigation of the mixing performances of close-clearance impellers in opaque systems is suggested. The analysis of the local and averaged conductivity time traces reveals the effect of important variables, such as the fluid viscosity and the vessel configuration, on the mixing time under various agitation conditions. The data collection and post processing procedures open the way to the application of the technique to multiphase and non-Newtonian fluids stirred with close-clearance impellers.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 3; 197--207
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of a mixing process induced by a rotating magnetic field with the application of magnetic particles
    Autorzy:
    Rakoczy, Rafał
    Kordas, Marian
    Markowska-Szczupak, Agata
    Konopacki, Maciej
    Augustyniak, Adrian
    Jabłońska, Joanna
    Paszkiewicz, Oliwia
    Dubrowska, Kamila
    Story, Grzegorz
    Story, Anna
    Ziętarska, Katarzyna
    Sołoducha, Dawid
    Borowski, Tomasz
    Roszak, Marta
    Grygorcewicz, Bartłomiej
    Dołęgowska, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/2086782.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixing process
    alternating magnetic field
    magnetic particles
    mixing time
    Navier–Stokes equation
    proces mieszania
    zmienne pole magnetyczne
    cząstki magnetyczne
    czas mieszania
    równanie Naviera-Stokesa
    Opis:
    We demonstrate in this study that a rotating magnetic field (RMF) and spinning magnetic particles using this kind of magnetic field give rise to a motion mechanism capable of triggering mixing effect in liquids. In this experimental work two mixing mechanisms were used, magnetohydrodynamics due to the Lorentz force and mixing due to magnetic particles under the action of RMF, acted upon by the Kelvin force. To evidence these mechanisms, we report mixing time measured during the neutralization process (weak acid-strong base) under the action of RMF with and without magnetic particles. The efficiency of the mixing process was enhanced by a maximum of 6.5% and 12.8% owing to the application of RMF and the synergistic effect of magnetic field and magnetic particles, respectively
    Źródło:
    Chemical and Process Engineering; 2021, 42, 2; 157--172
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High flow, low shear impellers versus high shear impellers; dispersion of oil drops in water and other examples
    Autorzy:
    Pacek, Andrzej W.
    Nienow, Alvin W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2034043.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high shear
    high flow descriptors
    drop sizes
    mixing time
    bioprocessing
    ścinanie
    deskryptory wysokiego przepływu
    rozmiar kropli
    czas mieszania
    bioprzetwarzanie
    Opis:
    Flow patterns generated by two ChemShear impellers, CS 2 and CS 4 have been measured and flow numbers calculated; Fl = 0.04 for both impellers. Transient and equilibrium drop sizes, d32 μm of 3 different viscosity silicone oils agitated by a high-shear Rushton turbine, RT, a low-shear, high-flow HE3 impeller and the two ChemShears were determined. The equilibrium d32 are correlated for all impellers, by d32 = 1300(εT )−0.58 max.svv0.14 with an R2 = 0.94. However, the time to reach steady state and the equilibrium size at the same specific power do not match the above descriptors of each impeller’s characteristics. In other literature, these descriptors are also misleading. In the case of mixing time, a high shear RT of the same size as a high flow HE3 requires the same time at the same specific power in vessels of H/T = 1. In bioprocessing, where concern for damage to cells is always present, free suspension animal cell culture with high shear RTs and low-shear impellers is equally effective; and with mycelial fermentations, damage to mycelia is greater with low shear than high. The problems with these descriptors have been known for some time but mixer manufacturers and ill-informed users and researchers continue to employ them.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 2; 77-90
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Blending characteristics of high-speed rotary impellers
    Autorzy:
    Fořt, I.
    Seichter, P.
    Pešl, L.
    Rieger, F.
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185151.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-speed rotary impeller
    turbulent flow
    impeller power input
    blending time
    impeller blending efficiency
    wirnik obrotowy dużych prędkości
    przepływ turbulentny
    pobór mocy wirnika
    czas mieszania
    efektywność mieszania wirnikiem
    Opis:
    This paper presents a comparison of the blending efficiency of eight high-speed rotary impellers in a fully baffled cylindrical vessel under the turbulent flow regime of agitated charge. Results of carried out experiments (blending time and impeller power input) confirm that the down pumping axial flow impellers exhibit better blending efficiency than the high-speed rotary impellers with prevailing radial discharge flow. It follows from presented remsults that, especially for large scale industrial mrealisations, the axial flow impellers with profiled blades bring maximum energy savings in mcomparison with the standard impellers with inclined flat blades (pitched blade impellers).
    Źródło:
    Chemical and Process Engineering; 2013, 34, 4; 427-434
    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 1-6 z 6

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