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    Wyświetlanie 1-12 z 12
    Tytuł:
    Unsteady natural convection in micropolar nanofluids
    Autorzy:
    Rup, K.
    Nering, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/240090.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micropolar fluid
    nanofluid
    heat transfer enhancement
    płyn mikropolarny
    nanopłyn
    intensyfikacja wymiany ciepła
    Opis:
    This paper presents the analysis of momentum, angular momentum and heat transfer during unsteady natural convection in micropolar nanofluids. Selected nanofluids treated as single phase fluids contain small particles with diameter size 10-38.4 nm. In particular three water-based nanofluids were analyzed. Volume fraction of these solutions was 6%. The first of the analyzed nanofluids contained TiO2 nanoparticles, the second one contained Al2O3 nanoparticles, and the third one the Cu nanoparticles.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 3; 155-170
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Micropolar flow over a black isothermal plate in the presence thermal radiation
    Autorzy:
    Raptis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839844.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn mikropolarny
    promieniowanie cieplne
    płyta izotermiczna
    micropolar fluid
    thermal radiation
    isothermal plate
    Opis:
    This study numerically investigates the effects of thermal radiation on the flow over a black isothermal plate for an optically thin gray micropolar fluid. The flowing medium absorbs and emits radiation, but scattering is not included. The computational results are discussed graphically for several selected flow parameters.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 235-241
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Squeeze flow modeling with the use of micropolar fluid theory
    Autorzy:
    Kucaba-Piętal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202239.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micropolar fluid
    squeeze flow
    MEMS
    tribology
    non-Newtonian fluid
    płyn mikropolarny
    tribologia
    ciecz nienewtonowska
    Opis:
    The aim of this paper is to study the applicability of micropolar fluid theory to modeling and to calculating tribological squeeze flow characteristics depending on the geometrical dimension of the flow field. Based on analytical solutions in the lubrication regime of squeeze flow between parallel plates, calculations of the load capacity and time required to squeeze the film are performed and compared – as a function of the distance between the plates – for both fluid models: the micropolar model and the Newtonian model. In particular, maximum distance between the plates for which the micropolar effects of the fluid become significant will be established. Values of rheological constants of the fluids, both those experimentally determined and predicted by means of using equilibrium molecular dynamics, have been used in the calculations. The same analysis was performed as a function of dimensionless microstructural parameters.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 927-933
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady MHD mixed convection flow of a micropolar fluid over a vertical wedge
    Autorzy:
    Roy, N. C.
    Gorla, R. S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/264759.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    micropolar fluid
    unsteady flow
    radiation
    heat generation
    płyn mikropolarny
    przepływ nieustalony
    promieniowanie
    wytwarzanie ciepła
    Opis:
    An analysis is presented to investigate the unsteady magnetohydrodynamic (MHD) mixed convection boundary-layer flow of a micropolar fluid over a vertical wedge in the presence of thermal radiation and heat generation or absorption. The free-stream velocity and surface temperature are assumed to be oscillating in magnitude but not in the direction of the oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the finite difference method for the entire frequency range, and the series solution for low frequency range and the asymptotic series expansion method for the high frequency range. Numerical solutions provide a good agreement with the series solutions. The amplitudes of skin friction and couple stress coefficients are found to be strongly dependent on the Richardson number and the vortex viscosity parameter. The Prandtl number, the conduction-radiation parameter, the surface temperature parameter and the pressure gradient parameter significantly affect the amplitudes of skin friction, couple stress and surface heat transfer rates. However, the amplitudes of skin friction coefficient are considerably affected by the magnetic field parameter, whereas the amplitudes of heat transfer rate are appreciably changed with the heat generation or absorption parameter. In addition, results are presented for the transient skin friction, couple stress and heat transfer rate with the variations of the Richardson number, the vortex viscosity parameter, the pressure gradient parameter and the magnetic field parameter.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 363-391
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Similarity solution of stagnation-point flow and heat transfer of a micropolar fluid towards a horizontal permeable exponentially elongating sheet with radiation, heat production/ immersion
    Autorzy:
    Parthiban, R.
    Palani, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174190.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn mikropolarny
    promieniowanie
    ssanie
    exponentially stretching sheet
    heat spring/drop
    micropolar fluid
    radiation
    suction/injection
    Opis:
    The current study aims to explore stagnation spot flow of a micropolar fluid about a plain linear exponentially expanding penetrable surface in the incidence of radiation and in-house heat production/immersion. Through similarity mapping, the mathematical modeling statements are transformed to ODE's and numerical results are found by shooting techniques. The impact of varying physical constants on momentum, micro-rotation and temperature is demonstrated through graphs. The computed measures including shear, couple stress, mass transfer and the local surface heat flux with distinct measures of factors involved in this proposed problem are presented through a table.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 179--191
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boundary layer flow of magneto-micropolar nanofluid flow with Hall and ion-slip effects using variable thermal diffusivity
    Autorzy:
    Bilal, M.
    Hussain, S.
    Sagheer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202030.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Hall effect
    nanofluid
    ion-slip effect
    magneto-micropolar fluid
    shooting method
    Efekt Halla
    płyn mikropolarny
    Opis:
    In the present article, magneto-micropolar nanofluid flow with suction or injection in a porous medium over a stretching sheet for the heat and mass transfer is analyzed numerically. Both Hall and ion-slip effects are considered along with variable thermal diffusivity. The governing partial differential equations are transformed to ordinary differential equations using usual similarity transformations. These coupled non-linear differential equations are solved using the shooting method. Effects of prominent parameter on velocities, temperature and concentration are discussed graphically. Numerical values of skin-friction coefficient, local Nusselt number and local Sherwood number are also tabulated and discussed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 3; 383-390
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A numerical approach to slip flow of a micropolar fluid above a flat permeable contracting surface
    Autorzy:
    Parthiban, R.
    Palani, G.
    Tinker, Seema
    Sharma, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839882.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    warstwa graniczna
    radiator
    płyn mikropolarny
    ssanie
    boundary layers
    heat sink
    micropolar fluid
    slip condition
    suction
    injection
    Opis:
    A plain linear penetrable contracting sheet with slip over a micro-polar liquid with a stagnation-point flow is analyzed. Through similarity mapping, the mathematical modeling statements are transformed as ODE’s and numerical results are found by shooting techniques. The varying impacts of physical quantities on the momentum, micro-rotation, and temperature were demonstrated through graphs. The computed measures including shear and couple stress with distinct measures of factors involved in this proposed problem are presented through a table.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 173-185
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of chemical reaction on magneto-micropolar fluid flow from a radiative surface with variable permeability
    Autorzy:
    Sharma, B. K.
    Singh, A. P.
    Yadav, K.
    Chaudhary, R. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/264925.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    reakcja chemiczna
    płyn mikropolarny
    magnetohydrodynamika
    wymiana ciepła
    chemical reaction
    micropolar fluid
    microrotation
    magnetohydrodynamics
    heat and mass transfer
    Opis:
    This paper presents a study of a hydromagnetic free convection flow of an electrically conducting micropolar fluid past a vertical plate through a porous medium with a heat source, taking into account the homogeneous chemical reaction of first order. A uniform magnetic field has also been considered in the study which acts perpendicular to the porous surface of the above plate. The analysis has been done by assuming varying permeability of the medium and the Rosseland approximation has been used to describe the radiative heat flux in the energy equation. Numerical results are presented graphically in the form of velocity, micro- rotation, concentration and temperature profiles, the skin-friction coefficient, the couple stress coefficient, the rate of heat and mass transfers at the wall for different material parameters. The study clearly demonstrates how a chemical reaction influences the above parameters under given conditions.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 833-851
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scrutinization of Joule heating and viscous dissipation on MHD flow and melting heat transfer over a stretching sheet
    Autorzy:
    Kumar, K. G.
    Gireesha, B. J.
    Manjunatha, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/264626.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    metoda numeryczna
    dyssypacja lepkości
    płyn mikropolarny
    Joule heating
    viscous dissipation
    stretching sheet
    micro polar dusty fluid
    numerical method
    Opis:
    The present paper deals with an analysis of the combined effect of Joule heating and viscous dissipation on an MHD boundary layer flow and melting heat transfer of a micro polar fluid over a stretching surface. Governing equations of the problem are transformed into a set of coupled nonlinear ordinary differential equations by applying proper transformations and then they are solved numerically using the RKF-45 method. The method is verified by a comparison with the established results with limiting solution. The influence of the various interesting parameters on the flow and heat transfer is analyzed in detail through plotted graphs.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 429-443
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drag force of a porous particle moving axisymmetrically in a closed cavity of micropolar fluid
    Autorzy:
    Madasu, Krishna Prasad
    Powiązania:
    https://bibliotekanauki.pl/articles/122694.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    micropolar fluid
    Stokes flow
    sphere
    concentric
    drag force
    płyn mikropolarny
    prawo Stokesa
    siła tarcia
    siła hydrodynamiczna
    przepływ pełzający
    Opis:
    The present paper deals with the problem of an incompressible axisymmetric creeping flow caused by a porous spherical particle in a spherical cavity filled with micropolar fluid. Depending on the kind of cell model, appropriate boundary conditions are used on the surface of sphere and spherical cavity. Drag force on the porous particle in the presence of a cavity is calculated to determine the correction factor to the Stokes law. A general expression for the hydrodynamic force acting on the porous sphere and, hence, for the wall correction factor of the sphere are obtained. The special cases of the porous sphere in viscous fluid, zero permeability solid sphere in micropolar fluid and viscous fluid are obtained in open and closed cavity respectively.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 4; 41-51
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of slip velocity in a magneto-micropolar fluid flow from a radiative surface with variable permeability: a numerical study
    Autorzy:
    Sharma, B. K.
    Tailor, V.
    Goyal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265273.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    slip velocity
    chemical reaction
    micropolar fluid
    MHD
    heat and mass transfer
    FDM
    poślizg
    reakcja chemiczna
    płyn mikropolarny
    magnetohydrodynamika
    przenoszenie ciepła
    Opis:
    An analysis is presented to describe the hydromagnetic mixed convection flow of an electrically conducting micropolar fluid past a vertical plate through a porous medium with radiation and slip flow regime. A uniform magnetic field has been considered in the study which absorbs the micropolar fluid with a varying suction velocity and acts perpendicular to the porous surface of the above plate. The governing non-linear partial differential equations have been transformed into linear partial differential equations, which are solved numerically by applying the explicit finite difference method. The numerical results are presented graphically in the form of velocity, micro-rotation, concentration and temperature profiles, the skin-friction coefficient, the couple stress coefficient, the rate of heat and mass transfers at the wall for different material parameters.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 637-651
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On axisymmetrical boundary problem of unsteady motion of micropolar fluid in the half-space
    Autorzy:
    El-Sirafy, I. H.
    Aboutahoun, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200251.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micropolar fluid
    axisymmetrical motion
    Laplace-Hankel transforms
    problem brzegowy
    płyn mikropolarny
    transformacja Laplace'a
    transformacja Hankela i Laplace'a
    warunek brzegowy Hankela
    Opis:
    The aim of this paper is developing an exact solution for the problem of axisymmetrical flow of unsteady motion of micropolar fluid in the half-space when the shear stresses are given on the boundary. The Laplace-Hankel transform technique is used to solve this problem. Some physical quantities such as velocities, pressure and microrotations are obtained and illustrated numerically.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 51-62
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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