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1
Content available Simulations of a multicomponent mixture in the reflux classifier todemonstrate the effect of dispersion coefficient on its internal state
Syed Naveedul Hasan, Khan Naseer Ahmed, Habib Muddasar
Physicochemical Problems of Mineral Processing
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2020
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Vol. 56, iss. 1
76--88
EN
In this study, influence of the dispersion coefficient on the internal state of a multicomponent mixture comprising 35 types of particle species with five different sizes ranging -2.0+0.25 mm and seven different densities, 1400 to 2000 kg/m3, in a reflux classifier under continuous process conditions is presented. Simulations were performed to study the effect of dispersion coefficient on the separation density, D50, separation efficiency, Ep, and solid volume fraction of the multicomponent mixture. The simulation results provided a good agreement with the published experimental results of the reflux classifier, operated at full scale in 2005, for a relatively high value of the dispersion coefficient, 0.0030 m2/s, and a relatively small value of the dispersion, 0.00030 m2/s, in the fluidization and inclined sections of the device, respectively. Moreover, different fixed values of the dispersion coefficient and a published proposed model of the dispersion coefficient were incorporated in the model to examine variations in the system and were compared with the validated simulation results. It was found that the selected values of the dispersion coefficient had not much effect on the D50 values. However, the Ep values changed significantly with changes in the dispersion coefficient values. The smaller values of the dispersion coefficient provided lower values of the Ep that did not match well with the validated simulation results. Furthermore, the variations in the total solid volume fraction within the reflux classifier for different values of the dispersion coefficient has been demonstrated.
2
Content available The effect of slip velocity on unsteady peristalsis MHD blood flow through a constricted artery experiencing body acceleration
Nandal J., Kumari S., Rathee R.
International Journal of Applied Mechanics and Engineering
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2019
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Vol. 24, no. 3
645--659
EN
In this analysis, we present a theoretical study to examine the combined effect of both slip velocity and periodic body acceleration on an unsteady generalized non-Newtonian blood flow through a stenosed artery with permeable wall. A constant transverse magnetic field is applied on the peristaltic flow of blood, treating it as an elastico-viscous, electrically conducting and incompressible fluid. Appropriate transformation methods are adopted to solve the unsteady non-Newtonian axially symmetric momentum equation in the cylindrical polar coordinate system with suitably prescribed conditions. To validate the applicability of the proposed analysis, analytical expressions for the axial velocity, fluid acceleration, wall shear stress and volumetric flow rate are computed and for having an adequate insight to blood flow behavior through a stenosed artery, graphs have been plotted with varying values of flow variables, to analyse the influence of the axial velocity, wall shear stress and volumetric flow rate of streaming blood.
3
Content available remote On Navier slip and Reynolds transpiration numbers
Ziółkowski P., Badur J.
Archives of Mechanics
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2018
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Vol. 70, nr 3
269--300
EN
In this paper, based on the original argumentation of Reynolds and Maxwell, with consideration of previous experiences of the authors in the nano- and micro-flows area, a general form of boundary forces, that consist of contributions from the friction and the mobility components: f∂V = fr + fm, has been extended to common effects of the bulk and surface motion. Hence, adopting Reynolds’ reasoning to a porous media as a whole, we reexamine the Poiseuille–Knudsen–Reynolds equation in terms of the sum of three contributions: the bulk pressure-driven flow, and two mobility surface forces, namely the Knudsen surface slip-driven flow and the Reynolds surface thermally-driven flow. The main motivation of our work is to find the dimensionless contribution of the Navier slip number and the Reynolds thermal transpiration number in materials with high volumetric surface density.
4
Content available Role of slip velocity in a magneto-micropolar fluid flow from a radiative surface with variable permeability: a numerical study
Sharma B. K., Tailor V., Goyal M.
International Journal of Applied Mechanics and Engineering
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2017
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Vol. 22, no. 3
637--651
EN
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.
5
Content available Unsteady convection flow of a magnetomicropolar fluid past a vertical porous plate
Jain N. C., Gupta P., Sharma B.
International Journal of Applied Mechanics and Engineering
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2013
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Vol. 18, no. 1
43--53
EN
The paper deals with an unsteady two dimensional laminar slip flow of a viscous incompressible magnetomicropolar fluid past a semi infinite porous plate embedded in a porous medium. The flow is under the influence of a transverse magnetic field and heat source/sink. The free stream velocity follows an exponentially increasing or decreasing small perturbation law. The porous surface absorbs the fluid with time varying suction velocity. Expressions are obtained for velocity and temperature fields, mean angular velocity, skin friction and the Nusselt number.
6
Content available remote Hall and thermal radiative effects on an unsteady rotating free convection slip flow along a porous vertical moving plate
Jain N. C., Singh H.
International Journal of Applied Mechanics and Engineering
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2012
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Vol. 17, no. 1
53-70
EN
The present investigation is made to study the effects of Hall current and thermal radiation on an unsteady free convection flow in an incompressible, viscous fluid through a porous medium in a rotating system with a transversely applied magnetic field. A perturbation technique is used to obtain the solutions of velocity and temperature fields by separating real and imaginary parts. Expressions for the skin friction and Nusselt number are also derived. It is observed that an increase in the Hall parameter (m) decreases the primary skin friction ( p), but increases the secondary skin friction ( s) while an increase in the radiation parameter decreases the Nusselt number (Nu).
7
Content available Prędkość unoszenia fazy rozproszonej przy wznoszącym przepływie ciekłego układu dyspersyjnego typu o/w
Dybek B., Hapanowicz J.
Inżynieria i Aparatura Chemiczna
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2010
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Nr 2
29-30
PL
Praca dotyczy zjawiska poślizgu faz, a szczególnie prędkości dry fu kropel oleju w strumieniu wody płynącym ku górze. Wskazano w niej na równania mogące znaleźć zastosowanie do opisu swobodnego ruchu kropel w cieczy. Na podstawie wyników własnych eksperymentów zweryfikowano celowość ich wykorzystania.
EN
A slip phenomenon of phases in liquid - liquid two-phase upflow is discussed in the paper. Especially the drift velocity of oil droplets in water stream is discussed. Equations describing the oil droplet terminal velocity in water are presented. The drift velocity values calculated from the equations were compared with those obtained experimentally.
8
Content available remote Hall effects on unsteady free convection slip flow in a rotating fluid along a porous vertical surface bounded by porous medium
Jain N. C., Gupta P.
International Journal of Applied Mechanics and Engineering
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2007
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Vol. 12, no 3
609-627
EN
The present analysis is made to investigate the effects of Hall current on the free convection flow of an incompressible, viscous fluid through a porous medium in a rotating system past an infinite vertical porous plate in the presence of a heat sink and a transversely applied uniform magnetic field. Solutions of velocity and temperature fields are obtained using the perturbation technique. Expressions for the skin motion and heat transfer are also derived. It is found that the increase in the magnetic parameter (M) decreases both the primary skin friction [...] and secondary skin friction [...] while an increase in the Hall parameter (m) decreases [...] but increases [...].
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