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    Wyświetlanie 1-12 z 12
    Tytuł:
    Triple diffusive convection of a non-Newtonian fluid under the combined effect of compressibility and variable gravity
    Autorzy:
    Aggarwal, A. K.
    Dixit, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/265482.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    dyfuzja
    płyn Rivlina-Ericksena
    ściśliwość
    zmienna grawitacja
    triple diffusion
    Rivlin-Ericksen fluid
    suspended particles
    porous medium
    compressibility
    variable gravity
    Opis:
    In this paper, triple diffusive convection in a Rivlin-Ericksen fluid layer, which is permeated with suspended particles in the porous medium under the effect of compressibility and variable gravity, is investigated. Linear stability theory and normal mode analysis have been used to study the problem under consideration. It is observed that, for stationary convection, suspended particles, compressibility and medium permeability have destabilizing/stabilizing effects under certain conditions. The variable gravity parameter destabilizes the system whereas stable solute gradients have a stabilizing effect.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 1-11
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermosolutal instability in compressible viscoelastic dusty fluid through porous medium
    Autorzy:
    Kumar, P.
    Mohan, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/265807.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn lepkosprężysty
    cząstki zawieszone
    materiały porowate
    thermosolutal instability
    compressible Walters B’ viscoelastic fluid
    suspended particles
    porous medium
    Opis:
    Thermosolutal instability in a compressible Walters B’ viscoelastic fluid with suspended particles through a porous medium is considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For stationary convection, the Walters B’ viscoelastic fluid behaves like a Newtonian fluid and it is found that suspended particles and medium permeability have a destabilizing effect whereas the stable solute gradient and compressibility have a stabilizing effect on the system. Graphs have been plotted by giving numerical values to the parameters to depict the stability characteristics. The stable solute gradient and viscoelasticity are found to introduce oscillatory modes in the system which are non-existent in their absence.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 99-112
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of superposed fluids through magnetic field with suspended particles of different permeability saturated through porous layer
    Autorzy:
    Singh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265428.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    porous medium
    suspended particles
    Rivlin-Ericksen fluid
    magnetic field
    porowatość
    pole magnetyczne
    ciecz Rivlina-Ericksena
    Opis:
    The instability of plane interface between two superposed Rivlin-Ericksen elastico-viscous fluids saturated through a porous medium has been studied to include the suspended (dust) particles effect. Following the linearized stability theory and normal mode analysis the dispersion relation is obtained. For stationary convection, the Rivlin-Ericksen elastico-viscous fluid behaves like Newtonian fluids. It found that for a potentially stable arrangement the Rivlin-Ericksen elastico-viscous fluid of different permeabilities in the presence of suspended particles in a porous medium is stable, whereas in a potentially unstable case instability of the system occurs. In the presence of a magnetic field for a potentially stable arrangement the system is always stable and for the potentially unstable arrangement, the magnetic field succeeds in stabilizing certain wave-number band which was unstable in the absence of the magnetic field.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 889-898
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation study on clogging of suspended particles in in-situ leaching of uranium at different concentrations and flow velocity
    Autorzy:
    Zhou, Chunze
    Wang, Hongqiang
    Wu, Tongpan
    Hu, Eming
    Lei, Zhiwu
    Wang, Qingliang
    Powiązania:
    https://bibliotekanauki.pl/articles/24085848.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    in-situ leaching of uraniom
    physical clogging
    suspended particles
    porous medium
    permeability coefficient
    Opis:
    Clogging problem has become one of the key problems restricting the mining efficiency of in-situ leaching of uranium, and the related research on the law and mechanism of physical clogging has not been reported. In order to identify and understand the complicated law and mechanism, experimental device is established to simulate the physical clogging caused by suspended particles in the uranium process, the physical clogging law and mechanism under different concentrations and velocity of flow are studied. The experimental results show that with the concentration of suspended particles increasing from 100, 200, 300 to 400 mg/L, the permeability of porous media gradually decreases, and the clogging phenomenon becomes more and more obvious. When the size of suspended particles is small and the velocity is 15 mL/min, the porous medium will not appear clogging, while the velocity is 25mL/min, the whole porous medium will slowly appear internal deposition clogging. When the size of suspended solids is larger and the flow rate is 9, 12, 15mL/min, the higher the velocity, the faster the clogging will be, and backwash can alleviate the surface clogging but cannot change the final clogging result. According to the experiment and actual situation, the physical clogging in in-situ leaching of uranium is mainly surface clogging and filter clogging.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162150
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of active carbon with various particle shapes obtained in char-steam reaction
    Autorzy:
    Buczek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/185786.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zgazowanie
    cząstki cylindryczne
    węgiel aktywny
    struktura porowata
    porous structure
    surface area
    partial gasification
    ring and cylindrical particles
    active carbons
    Opis:
    The porous structure of cylindrical and ring-shaped char material was developed by partial steam gasification. Micropore and mesopore structures of active carbons with various forms of burn-off were evaluated by nitrogen adsorption/desorption isotherms. Parameters of the Dubinin-Radushkevich equation were calculated as well as the micropore size distribution by the Horvath-Kawazoe method. The results of textural investigations showed that more uniform micropore structure and better mechanical properties were found for ring-shaped active carbons.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 3; 335-344
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On thermal instability of Kuvshiniski fluid with suspended particles saturated in a porous medium in the presence of a magnetic field
    Autorzy:
    Singh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265476.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    thermal convection
    Kuvshiniski fluid
    suspended particles
    magnetic field
    porous medium
    Opis:
    The thermal instability of a Kuvshiniski viscoelastic fluid is considered to include the effects of a uniform horizontal magnetic field, suspended particles saturated in a porous medium. The analysis is carried out within the framework of the linear stability theory and normal mode technique. For the case of stationary convection, the Kuvshiniski viscoelastic fluid behaves like a Newtonian fluid and the magnetic field has a stabilizing effect, whereas medium permeability and suspended particles are found to have a destabilizing effect on the system, oscillatory modes are introduced in the system, in the absence of these the principle of exchange of stabilities is valid. Graphs in each case have been plotted by giving numerical values to the parameters, depicting the stability characteristics. Sufficient conditions for the avoidance of overstability are also obtained.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 981-994
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydroxy functionalized porous polymer particles derived from mixtures of hydrophilic and hydrophobic monomers
    Hydroksyfunkcjonalizowane porowate cząstki polimerowe otrzymane z mieszaniny hydrofilowych i hydrofobowych monomerów
    Autorzy:
    Bukowska, A.
    Bukowski, W.
    Kleczyńska, S.
    Dychtoń, K.
    Drajewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/947283.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    2-hydroxyethyl methacrylate
    hydroxy functionalized porous polymer particles
    suspension polymerization
    w/o emulsion
    metakrylan 2-hydroksyetylu
    hydroksyfunkcjonalizowane porowate cząstki polimerowe
    polimeryzacja suspensyjna
    emulsja w/o
    Opis:
    Porous, hydroxy functionalized, polymer particles, having BET surface areas up to 146 m2/g, were synthesized by suspension polymerization of water in oil (w/o) emulsions. The emulsions were prepared by mixing polyoxyethylene sorbitan monooleate (Tween-80) solutions in water with a mixture of 2-hydroxyethyl methacrylate (HEMA), styrene (S) and divinylbenzene (DVB) dissolved in a mixture of cyclohexanol (CyOH) and octanol (OctOH). The resulting polymer particles were characterized by optical microscopy, scanning electron microscopy, infrared spectroscopy, and thermal gravimetric analysis. Nitrogen adsorption/desorption isotherms and particle size distribution were also determined. The influence of the organic porogen nature and the concentrations of divinylbenzene and Tween-80, the fraction of water in the w/o emulsions and the agitator rotation on the properties of the provided polymer particles were analyzed and discussed.
    Nowe hydroksyfunkcjonalizowane porowate cząstki polimerowe o powierzchni właściwej 146 m2/g syntetyzowano metodą polimeryzacji suspensyjnej emulsji typu woda w oleju w/o. Emulsje otrzymano w wyniku zmieszania wodnych roztworów Tween-80 z mieszaniną metakrylanu 2-hydroksyetylu (HEMA), styrenu (S) i diwinylobenzenu (DVB) rozpuszczoną w mieszaninie cykloheksanolu (CyOH) i oktanolu (OctOH). Otrzymane polimery charakteryzowano metodami mikroskopii optycznej, skaningowej mikroskopii elektronowej, spektroskopii w podczerwieni i analizy termicznej (TGA). Wyznaczono także izotermy adsorpcji/desorpcji oraz rozkład wielkości ziaren uzyskanych na drodze polimeryzacji. Przeanalizowano wpływ natury porogenu, stężenia DVB i Tween-80 na charakterystykę otrzymanych cząstek.
    Źródło:
    Polimery; 2016, 61, 9; 616-625
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydromagnetic thermal instability of compressible Walters' (Model B') rotating fluid permeated with suspended particles in porous medium
    Autorzy:
    Rana, G. C.
    Jamwal, H. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/178884.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    lepkosprężyste ciecze Walters B
    cząstki zawieszone
    ośrodek porowaty
    niestabilność termiczna
    Walters B' viscoelastic fluid
    suspended particles
    porous medium
    thermal instability
    Opis:
    In this paper, the thermal instability of compressible Walters’ (Model B′) rotating fluid permeated with suspended particles (fine dust) in porous medium in hydromagnetics is considered. By applying normal mode analysis method, the dispersion relation has been derived and solved analytically. It is observed that the rotation, magnetic field, suspended particles and viscoelasticity introduce oscillatory modes. For stationary convection, Walters’ (Model B′) elastico-viscous fluid behaves like an ordinary Newtonian fluid and it is observed that rotation has stabilizing effect, suspended particles are found to have destabilizing effect on the system, whereas the medium permeability has stabilizing or destabilizing effect on the system under certain conditions. The magnetic field has destabilizing effect in the absence of rotation, whereas in the presence of rotation, magnetic field has stabilizing or destabilizing effect under certain conditions.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 4; 75-88
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrodynamic and hydromagnetic stability of two superposed elastico – viscous fluids of different permeability with dust in porous medium
    Autorzy:
    Singh, M.
    Mehta, C. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/266188.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Rayleigh-Taylor instability
    magnetic field
    suspended particles
    Walters' B fluid
    different permeability and porous medium
    pole magnetyczne
    materiały porowate
    lepkość płynu
    Opis:
    Rayleigh-Taylor instability of two superposed Walters’ B has elastico-viscous fluids in a uniform magnetic field through a porous medium with different permeability been studied to include the suspended (dust) particles effect. Using normal mode technique a dispersion relation has been derived. The stability analysis has been carried out. The magnetic field stabilizes the unstable configuration for the wave number band K > K* in chich the system is unstable in the absence of the magnetic field. It is also found that for a potential stable arrangement for Walters B’ elastico-viscous fluids of different permeabilities in the presence of suspended particles through a porous medium the system is stable, whereas in the potentially unstable case instability of the system occurs.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 407-416
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hall effect on thermal instability of viscoelastic dusty fluid in porous medium
    Autorzy:
    Singh, M.
    Gupta, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/265280.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    niestabilność termiczna
    płyn lepkosprężysty
    porowatość
    thermal instability
    Rivlin-Ericksen viscoelastic fluid
    suspended particles
    Hall current effect
    porous medium
    Opis:
    The effect of Hall currents and suspended dusty particles on the hydromagnetic stability of a compressible, electrically conducting Rivlin-Ericksen elastico viscous fluid in a porous medium is considered. Following the linearized stability theory and normal mode analysis the dispersion relation is obtained. For the case of stationary convection, Hall currents and suspended particles are found to have destabilizing effects whereas compressibility and magnetic field have stabilizing effects on the system. The medium permeability, however, has stabilizing and destabilizing effects on thermal instability in contrast to its destabilizing effect in the absence of the magnetic field. The critical Rayleigh numbers and the wave numbers of the associated disturbances for the onset of instability as stationary convection are obtained and the behavior of various parameters on critical thermal Rayleigh numbers are depicted graphically. The magnetic field, Hall currents and viscoelasticity parameter are found to introduce oscillatory modes in the systems, which did not exist in the absence of these parameters.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 871-886
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fixed Bed System Packed with Porous Materials for Removal of Organic Dye from Wastewater
    Autorzy:
    Cho, Young-Sang
    Sung, Sohyeon
    Powiązania:
    https://bibliotekanauki.pl/articles/2203706.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porous particles
    photocatalyst
    adsorbent
    fixed bed
    Opis:
    Fixed beds were adopted for removal of organic dye from water by photocatalytic decomposition or adsorption. To this end, macroporous titania or silica micro-particles were synthesized from emulsions as micro-reactors and packed in the bed. During feeding aqueous methylene blue solution, UV light was irradiated for generation of active radicals for removal of dye by photocatalytic decomposition. Porous silica particles were also used as adsorbents in the bed for continuous adsorption of organic dye. For regeneration of the porous titania or silica particles, rinsing with fresh water was carried out before repeated cycles.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 51--56
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of suspended particles on thermosolutal convection of Rivlin-Ericksen fluid in porous medium with variable gravity
    Autorzy:
    Aggarwal, A. K.
    Dixit, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/264370.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn Rivlina-Ericksena
    cząstki zawieszone
    materiały porowate
    zmienna grawitacja
    thermosolutal convection
    Rivlin-Ericksen fluid
    suspended particles
    porous medium
    varying gravity
    Opis:
    The thermosolutal stability of a layer of the Rivlin-Ericksen fluid in a porous medium is considered under varying gravity conditions. It is found that for stationary convection, medium permeability and suspended particles have a destabilizing/stabilizing effect when gravity increases/decreases. The stable solute gradient has a stabilizing effect on the system.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 813-820
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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