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Wyszukujesz frazę "Chand, R." wg kryterium: Autor

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    Tytuł:
    On the onset of thermal convection in a layer of Oldroydian visco-elastic fluid saturated by Brinkman–Darcy porous medium
    Autorzy:
    Chand, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/178803.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    thermal instability
    Oldroydian viscoelastic fluid
    Brinkman–Darcy number
    Prandtl–Darcy number
    Opis:
    Thermal instability in a horizontal layer of Oldroydian visco-elastic fluid in a porous medium is investigated. For porous medium the Brinkman–Darcy model is considered. A linear stability analysis based upon perturbation method and normal mode technique is used to find solution of the fluid layer confined between two free-free boundaries. The onset criterion for stationary and oscillatory convection is derived analytically. The influence of the Brinkman–Darcy, Prandtl–Darcy number, stress relaxation parameter on the stationary and oscillatory convection is studied both analytically and graphically. The sufficient condition for the validity of PES has also been derived.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 4; 3-10
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magneto convection in a layer of nanofluid with soret effect
    Autorzy:
    Chand, R.
    Rana, G. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/387119.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    nanofluid
    Zero-Flux
    Soret Effect
    Nanofluid Lewis Number
    Chandrasekhar Number
    Galerkin methods
    magnetic field
    pole magnatyczne
    metoda Galerkina
    efekt Soreta
    liczba Lewisa
    liczba Chandrasekhara
    nanopłyny
    nanociecze
    Opis:
    Double diffusive convection in a horizontal layer of nanofluid in the presence of uniform vertical magnetic field with Soret effect is investigated for more realistic boundary conditions. The flux of volume fraction of nanoparticles is taken to be zero on the isothermal boundaries. The normal mode method is used to find linear stability analysis for the fluid layer. Oscillatory convection is ruled out because of the absence of the two opposing buoyancy forces. Graphs have been plotted to find the effects of various parameters on the stationary convection and it is found that magnetic field, solutal Rayleigh number and nanofluid Lewis number stabilizes fluid layer, while Soret effect, Lewis number, modified diffusivity ratio and nanoparticle Rayleigh number destabilize the fluid layer.
    Źródło:
    Acta Mechanica et Automatica; 2015, 9, 2; 63-69
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rayleigh-Bénard convection in an elastico-viscous Walters’ (model B’) nanofluid layer
    Autorzy:
    Rana, G. C.
    Chand, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/202036.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluid
    oscillatory convection
    Rayleigh-Benard convection
    viscoelasticity
    Walters' (model B') fluid
    oscylacyjna konwekcyjna
    komórki Bénarda
    lepkosprężystość
    Opis:
    In this study, the onset of convection in an elastico-viscous Walters’ (model B’) nanofluid horizontal layer heated from below is considered. The Walters’ (model B’) fluid model is employed to describe the rheological behavior of the nanofluid. By applying the linear stability theory and a normal mode analysis method, the dispersion relation has been derived. For the case of stationary convection, it is observed that the Walters’ (model B’) elastico-viscous nanofluid behaves like an ordinary Newtonian nanofluid. The effects of the various physical parameters of the system, namely, the concentration Rayleigh number, Prandtl number, capacity ratio, Lewis number and kinematics visco-elasticity coefficient on the stability of the system has been numerically investigated. In addition, sufficient conditions for the non-existence of oscillatory convection are also derived.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 235-244
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable gravity effects on thermal instability of nanofluid in anisotropic porous medium
    Autorzy:
    Chand, R.
    Rana, G. C.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/265426.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    porowatość
    liczba Rayleigha
    zmienna grawitacja
    nanofluid
    anisotropic porous medium
    Rayleigh number
    variable gravity
    Opis:
    In this paper, we study the effects of variable gravity on thermal instability in a horizontal layer of a nanofluid in an anisotropic porous medium. Darcy model been used for the porous medium. Also, it incorporates the effect of Brownian motion along with thermophoresis. The normal mode technique is used to find the confinement between two free boundaries. The expression of the Rayleigh number has been derived, and the effects of variable gravity and anisotropic parameters on the Rayleigh number have been presented graphically.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 631-642
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of rotation on the onset of electrohydrodynamic instability of an elastico-viscous dielectric fluid layer
    Autorzy:
    Rana, G. C.
    Chand, R.
    Sharma, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/199843.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Walters' fluid
    (model B’ fluid
    rotation
    AC electric field
    electrohydrodynamics
    viscosity
    viscoelasticity
    rotacja
    pole elektryczne
    elektrohydrodynamika
    lepkość
    lepkosprężystość
    płyn Waltersa
    elasto-lepki płyn Waltersa
    Opis:
    In this paper the combined effect of uniform rotation and AC electric field on the onset of instability in a horizontal layer of an elastico-viscous fluid stimulated by the dielectrophoretic force due to the variation of dielectric constant with temperature is studied. Walters’ (model B’) fluid model is used to describe rheological behaviour of an elastico-viscous fluid. The onset criterions for stationary and oscillatory convection are derived for the case of free-free boundaries. It is observed that Walters’ (model B’) fluid behaves like an ordinary Newtonian fluid and rotation has stabilizing influence whereas AC electric field has destabilizing influence on the stability of the system. The necessary condition for the occurrence of oscillatory convection is also obtained. The present results are in good agreement with the earlier published results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 143-149
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Triple-diffusive convection in Walters' (Model B') fluid with varying gravity field saturating a porous medium
    Autorzy:
    Kango, S. K.
    Rana, G. C.
    Chand, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/178886.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    lepkosprężyste ciecze Walters B
    ciecz Waltersa
    ośrodek porowaty
    konwekcja
    Walters' (model B') fluid
    Walters' B liquid model
    Walters' B' fluid
    porous media
    convection
    Opis:
    The Triple-Diffusive convection in Walters’ (Model B') fluid with varying gravity field is considered in the presence of uniform vertical magnetic field in porous medium. For the case of stationary convection, the magnetic field, varying gravity field and the stable solute gradients have stabilizing effects whereas the medium permeability has destabilizing (or stabilizing) effect on the system under certain conditions. A linear stability analysis theory and normal mode analysis method have been carried out to study the onset convection. The kinematic viscoelasticity has no effect on the stationary convection. The solute gradients, magnetic field, varying gravity field, porosity and kinematic viscoelasticity introduce oscillatory modes in the system, which were non-existent in their absence. The sufficient conditions for the non-existence of overstability are also obtained. The results are also shown graphically.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 3; 45-56
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transition in Quasi-Two-Dimensional Horizontally Driven Granular System
    Autorzy:
    Shah, S.
    Li, Y.
    Khan, W.
    Din, N.
    Chand, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489921.pdf
    Data publikacji:
    2012-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Rm
    64.60.-i
    Opis:
    In an experimental setup, consisting of quasi-two-dimensional square cell, the motion of monodisperse spherical steel balls is studied. The cell is vibrated horizontally to eradicate the compaction of balls due to gravity. By raising the number density of the steel balls, the dilute fluid has been gradually alternated into dense fluid. The temperature of granular media, along the driven and transverse directions, has been found to be anisotropic. Transition from granular gas to the liquid-like fluid has been observed. The radial distribution function of the balls in the cell is investigated for the authentication of the structural changes. Furthermore, the fast Fourier transformation for the 2D system is carried out to confirm these changes.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 3; 699-702
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical determination of apparent mass variation of granular media confined in silo geometry
    Autorzy:
    Qadir, Abdul
    Ispalove, Nurlybek
    Ali, Asim
    Chand, R.
    Shah, M.
    Khan, Asif
    Hussain, Kashif
    Powiązania:
    https://bibliotekanauki.pl/articles/1070521.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    83.80.Fg
    45.70.Cc
    45.70.-n
    Opis:
    Granular materials have vast applications both in industry and in daily life. They display quite interesting and exceptional properties different from the other known forms of matter. To investigate the complex properties of particulate materials, experimental, analytical, and numerical techniques have been employed. In this paper the results of experimental and numerical tests of various grain sizes and coefficient of friction between granules and cylindrical walls on the mass measured at bottom of container, known as apparent mass, are reported. It is revealed that apparent mass augments with the grain size. Moreover, it is also found that the variation in apparent mass measurement is strongly dependent on bead diameter rather than the silo size. The results suggest that the conversion of vertical stresses into horizontal in silo is mainly due to the friction between the grain and system boundary than the arching phenomenon.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 378-382
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow behavior in weakly permeable micro-tube with varying viscosity near the wall
    Autorzy:
    Gupta, R. R.
    Kumar, V.
    Chand, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779656.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    hollow-fiber
    micro-tube
    permeation
    algorithm
    variable viscosity
    velocity profile
    equation of motion
    navier-stokes equation
    Opis:
    Weakly permeable micro-tubes are employed in many applications involving heat and/or mass transfer. During these processes, either solute concentration builds up (mass transfer) or steep change in temperature (heat transfer) takes place near the permeable wall causing a change in the viscosity of the fluid. Results of the present work suggest that such change in viscosity leads to a considerable alteration in the flow behavior, and the commonly assumed parabolic velocity profile no longer exists. To solve the problem numerically, the equation of motion was simplified to represent permeation of incompressible, Newtonian fluid with changing viscosity through a micro-tube. Even after considerable simplification, the accuracy of the results was the same as that obtained by previously reported results for some specific cases using rigorous formulation. The algorithm developed in the present work is found to be numerically robust and simple so that it can be easily integrated with other simulations.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 4; 16-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compression loading behaviour of sunflower seeds and kernels
    Autorzy:
    Selvam, T.A.
    Manikantan, M.R.
    Chand, T.
    Sharma, R.
    Seerangurayar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/25294.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    compression loading
    sunflower
    seed
    kernel
    rupture energy
    moisture content
    Opis:
    The present study was carried out to investigate the compression loading behaviour of five Indian sunflower varieties (NIRMAL-196, NIRMAL-303, CO-2, KBSH-41, and PSH-996) under four different moisture levels (6-18% d.b). The initial cracking force, mean rupture force, and rupture energy were measured as a function of moisture content. The observed results showed that the initial cracking force decreased linearly with an increase in moisture content for all varieties. The mean rupture force also decreased linearly with an increase in moisture content. However, the rupture energy was found to be increasing linearly for seed and kernel with moisture content. NIRMAL-196 and PSH-996 had maximum and minimum values of all the attributes studied for both seed and kernel, respectively. The values of all the studied attributes were higher for seed than kernel of all the varieties at all moisture levels. There was a significant effect of moisture and variety on compression loading behaviour.
    Źródło:
    International Agrophysics; 2014, 28, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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