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 | Steady Motion of a Circular Cylinder in a Dusty Gas
Author : Rukmangadachari, E.
Source : Defence Science Journal ; Vol:31(1) ; 1981 ; pp 31-38
Subject : 621 Mechanical Engineering
Keywords : Stokes number ;Reynolds number;Equation for mass concentration
Abstract : Effect of uniform motion of a circular cylinder in the dusty gas otherwise at rest at infinity is discussed. The dust particles are assumed to have small relaxation time. An equation for the mass concentration of dust near the cylinder is derived and solved analytically using a potential solution of gas flow at large Reynolds number. Particles do not collide with the cylinder until the stokes number neta is greater than 1/8, if we assume that the gas flow is unchanged by the presence of dust particles. |
| | Hall Effects on MHD Flow Through a Porous Straight Channel
Author : Bathaiah, D. ;Reddy, N. Bhaskara
Source : Defence Science Journal ; Vol:32(4) ; 1982 ; pp 313-326
Subject : 532.542 Fluid Dynamics
Keywords : Reynolds number ;Hall currents
Abstract : The effect of Hall currents on the flow of a viscous incompressible slightly conducting fluid through a porous straight channel under a uniform transverse magnetic field is considered. The pressure gradient is taken as constant quantity and the case of steady flow is obtained by taking the time since the start of the motion to be infinite. Skin friction, temperature distribution and coefficients of heat transfer at both the plates have been evaluated. The effects of Hall parameter, magnetic parameter and Reynolds number on the above physical quantities have been investigated. Velocity distribution when the pressure gradient (i) varies linearly with time, and (ii) decreases exponentially with time has also been evaluated. |
| | Unsteady Flow of Two Immiscible Viscous Fluids Over a Naturally Permeable Bed
Author : Sai, K.S.
Source : Defence Science Journal ; Vol:40(2) ; 1990 ; pp 183-189
Subject : 532.542 Fluid Dynamics
Keywords : Permeable interface;Darcy law;Reynolds number;Slip parameter;Porous parameter
Abstract : The unsteady flow of two viscous, incompressible and immiscible fluids in a long parallel channel of which the upper one is impervious and lower one is porous of infinite thickness is considered by taking a pressure gradient of the form Pe/sup ct/, where P and c are constants. Beavers and Joseph's slip condition at the permeable interface and the generalised Darcy's law in the porous region have been used. The analysis reveals that the flow depends upon the Reynolds number for the upper and lower fluids, slip parameter and the porous parameter. The effect of slip parameter alpha and the porous parameter neta on the flow are studied in detail. |
| | Steady Radial Flow of Second Order Fluids between Two Infinite Parallel Discs One Rotating and the Other at Rest
Author : Rajvanshi, S.C.
Source : Defence Science Journal ; Vol:19(1) ; 1969 ; pp 39-48
Subject : 532 Fluid Mechanics
Keywords : Reynolds number ;Radial flow;Fluids
Abstract : The laminar radial flow of second order fluids between two infinite parallel discs (one rotating and the other at rest) has been discussed. A source of strength M is assumed to be present on the axis of rotation, which induces the radial flow. The solution is obtained in powers of the radius vector, for small values of the Reynolds number R (=pwd/sup 2/fi/sub 1/). |
| | Tangential Velocity Profile for Axial Flow Through Two Concentric Rotating Cylinders with Radial Magnetic Field
Author : Nath, Girishwar
Source : Defence Science Journal ; Vol:20(4) ; 1970 ; pp 207-212
Subject : 532.542 Fluid Dynamics
Keywords : Reynolds number ;Cylinders composed;Axisymmetric flow
Abstract : A closed form solution of the Navier-Stokes equations has been obtained in the case of steady axisymmetric flow of an incompressible electrically conducting viscous fluid between two concentric rotating cylinders composed of an insulating material under the influence of radial magnetic field. It has been found that the velocity components are less than those of the classical hydrodynamic case. In the presence of the magnetic field, the tangential velocity becomes fully developed in a smaller axial distance than in the absence of the magnetic field. For small Reynolds number, the fully developed tangential velocity is achieved in a small axial distance, but it requires greater axial distance for large Reynolds number. |
| | Steady Laminar Second Grade Fluid Flow Between Two Rotating Porous Discs with Moderate Rotation
Author : Verma, P.D.;Sharma, P.R.
Source : Defence Science Journal ; Vol:38(1) ; 1988 ; pp 87-97
Subject : 532.542 Fluid Dynamics
Keywords : Perturbation technique;Reynolds number;Newtonian fluid
Abstract : "The flow of a second grade fluid between two rotating porous discs is investigated. The equations of motion are solved by a regular perturbation technique for small cross-flow Reynolds number. The effects of viscoelastic parameter-alpha, suction/injection parameter-R and rotation parameter-beta on the velocity components, pressure distribution and skin friction have been discussed numerically and the results are compared to those of Newtonian fluid case. " |
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