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    Wyświetlanie 1-8 z 8
    Tytuł:
    Exergetic Analysis For A Complete Node Of Fluidised-Bed Drying Of Poppy Seeds
    Autorzy:
    Skoneczna-Łuczków, J.
    Ciesielczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185488.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidised drying
    efficiency
    exergy
    poppy seed
    suszenia fluidalnego
    wydajność
    egzergia
    Opis:
    The article presents an experimental-theoretical analysis of fluidised-bed drying of poppy seeds directed on minimisation of energy. The analysis was performed for a complete drying node incorporating a heat exchanger and a fan. Two complementary factors were used in the exergetic evaluation: exergy efficiency and unit consumption of exergy. An analysis of drying in stationary bed was carried out for comparison purposes. Results of the exergetic analysis can become a basis for innovative works focused on decreasing energy consumption of a technological node being analysed, e.g. by the use of recirculation of fluidising-drying medium.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 4; 437-447
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energetic Efficiency of Mixing and Mass Transfer in Single Phase and Two-Phase Systems
    Autorzy:
    Bałdyga, J.
    Jasińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184853.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chemical test reaction
    energetic efficiency
    mass transfer
    mixing
    chemiczne reakcje testowe
    wydajność energetyczna
    transfer masy
    mieszanie
    Opis:
    In this work a concept of energetic efficiency of mixing is presented and discussed; a classical definition of mixing efficiency is modified to include effects of the Schmidt number and the Reynolds number. Generalization to turbulent flows is presented as well. It is shown how the energetic efficiency of mixing as well as efficiencies of drop breakage and mass transfer in twophase liquid-liquid systems can be identified using mathematical models and test chemical reactions. New expressions for analyzing efficiency problem are applied to identify the energetic efficiency of mixing in a stirred tank, a rotor stator mixer and a microreactor. Published experimental data and new results obtained using new systems of test reactions are applied. It has been shown that the efficiency of mixing is small in popular types of reactors and mixers and thus there is some space for improvement.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 1; 79-96
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of new chemical test reactions to study mass transfer from shrinking droplets and micromixing in the rotor-stator mixer
    Autorzy:
    Bałdyga, J.
    Kotowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184911.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efficiency of mixing
    mass transfer
    micromixing
    rotor-stator mixer
    test reaction
    wydajność mieszania
    transfer masy
    mikromieszanie
    reakcja testowa
    Opis:
    A pair of fast competitive reactions, neutralization and 2,2-dimetoxypropane (DMP) hydrolysis, has been applied do study mass transfer and micromixing in a T 50 Ultra-Turrax® - IKA rotor-stator device. In experiments the dispersed organic phase containing p-Toluenesulfonic acid (pTsOH) dissolved in diisopropyl ether, whereas the continuous phase was represented by the aqueous solution of sodium hydroxide, 2,2-dimetoxypropane (DMP) and ethanol. During mixing a fast mass transfer of a solute (pTsOH) from organic phase droplets, which were shrinking due to fast dissolution of the organic solvent, was followed by micromixing and chemical reactions in the continuous phase. Measured hydrolysis yields were applied to express effects of mixing on the course of chemical reactions. Modeling was based on application of models describing drop breakup, mass transfer in the liquid-liquid system and micromixing. Combined effects of mass transfer and drop breakage on drop population were expressed using the population balance equations. The model has been used to interpret experimental results, in particular to identify the efficiency of mixing.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 3; 477-489
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of CFD simulations of the flow pattern in an agitated system with a pitched blade worn turbine
    Autorzy:
    Skocilas, J.
    Fort, I.
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185244.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pitched blade impeller
    erosion wear
    ensemble-average mean velocity
    impeller
    pumping capacity
    CFD simulation
    prędkość uśredniona
    wirnik
    wydajność pompy
    symulacji CFD
    Opis:
    This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (= 45[degrees] and 30[degrees]) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors’ previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 39-49
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test Reactions To Study Efficiency Of Mixing
    Autorzy:
    Jasińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185281.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micromixing
    efficiency of mixing
    IEM model
    engulfment model
    chemical test
    reactions
    mikromieszanie
    wydajność mieszania
    model IEM
    model zatopienia
    test chemiczny
    Opis:
    Effects of mixing on the course of fast chemical reactions are relatively well understood, especially in homogeneous systems. This enables to design and operate chemical reactors with the goal to achieve a high yield of a desired product and use systems of complex reactions as a chemical probe (chemical test reactions) to identify progress of mixing and quality of mixture. Recently, a number of studies have focused on the application of chemical test reactions to identify energy efficiency of mixing, being a convenient way of comparing mixers and reactors in terms of their mixing efficiency. This review offers a presentation of chemical test reactions available in the literature and methods of applications of test reactions to identify the energy efficiency of mixing. Also methods to assess the extent of micromixing by measuring product distribution or segregation index, and to determine the time constant for mixing are presented for single phase homogeneous systems and two-phase liquid-liquid systems.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 2; 171-208
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Membrane gas separation module with pulsed retentate for low-permeable component recovery
    Autorzy:
    Battalov, Stanislav V.
    Trubyanov, Maxim M.
    Puzanov, Egor S.
    Sazanova, Tatyana S.
    Drozdov, Pavel N
    Vorotyntsev, Ilya V.
    Powiązania:
    https://bibliotekanauki.pl/articles/185429.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    membrane gas separation
    unsteady-state operation
    process intensification
    separation
    efficiency
    membrane module
    separacja gazów membranowych
    operacja niestabilna
    intensyfikacja procesu
    separacja
    wydajność
    moduł membranowy
    Opis:
    The paper presents the experimentalstudy of a novel unsteady-statemembrane gas separation approachfor recovery of a slow-permeant component in the membrane module with periodical retentate with-drawals. The case study consisted in the separation of binary test mixtures based on the fast-permeantmain component (N2O, C2H2) and the slow-permeant impurity (1% vol. of N2)using a radial counter-current membrane module. The novel semi-batch withdrawal technique was shown to intensify theseparation process and provide up to 40% increase in separation efficiency compared to a steady-stateoperation of the same productivity.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 1; 57--65
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pumping capacity of pitched blade multi – stage impellers
    Autorzy:
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185756.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pitched blade impeller
    multi-stage impeller
    impeller pumping capacity
    velocity
    profile
    laser Doppler anemometry
    wirnik wielostopniowy
    wydajność pompowania wirnika
    prędkość
    profil
    laser Dopplera
    Opis:
    This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity and flow in the mixing bath in comparison with an independently operating pitched blade impeller with the same geometry. In case of a relatively close distance between Impellers H3/d= 0.5 - 0.75, the multi-stage impeller creates only one circulation loop and the impellers itself behave identically as pumps in series. However for relative higher distance of impellers than H3/d= 1.25, the multi-stage impeller creates two separated circulation loops.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 1; 47-53
    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 1-8 z 8

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