| || On the Flow of a Visco Elastic Fluid between Two Rotating Non Concentric Cylinders for Small Eccentricity
Author : Verma, P.D.;Chaudhary, R.C.;Rajvanshi, S.C.
Source : Defence Science Journal ; Vol:28(3) ; 1978 ; pp 109-116
Subject : 532.542 Fluid Dynamics
Keywords : Navier Stokes Equations;Bessel Functions;Newtonian Fluid
Abstract : The motion of a visco elastic fluid contained between two rotating circular cylinders whose axes are set slightly apart is considered. An approximate solution of the Navier Stokes equations is obtained by a perturbation method for the case of small eccentricity. The expansions contain a perturbation parameter Epsional related to the eccentricity e which is assumed to be small. The method entails the employment of asymptotic expansions of Bessel functions and the results thus obtained are valid for finite gap between the two cylinders. The leading terms of the expansions are the exact solution to the Couette flow of Newtonian Fluid between concentric rotating cylinders. The Transverse velocity profiles are presented for small eccentricity and gap, when both the cylinders are rotating with the same angular velocities in the same direction and compared with the corresponding transverse velocity profile in Newtonian flow.
| || Flow of an Oldroyd Fluid Past a Sphere at Low Reynolds Number
Author : Chaudhary, R.C. ;Verma, P.D.
Source : Defence Science Journal ; Vol:31(3) ; 1981 ; pp 251-254
Subject : 532 Fluid Mechanics
Keywords : Drag ;Newtonian fluid;Asymptotic technique
Abstract : Slow motion of an Oldroyd fluid past a sphere has been investigated using matched asymptotic technique. The drag experienced by the sphere has been obtained form the solution. To the first order in tau ( a non-Newtonian parameter), the drag is unchanged from its value for Newtonian fluid but to the second order the drag is decreased.
| || Heat Transfer for Laminar Flow Through Parallel Porous Disks
Author : Gaur, Y.N. ;Chaudhary, R.C.
Source : Defence Science Journal ; Vol:30(3) ; 1980 ; pp 153-158
Subject : 536.2 Heat Transfer;536 Thermodynamics
Keywords : Injection suction velocities ;Nusselt numbers;Porous disks
Abstract : The problem of temperature distribution and heat transfer for laminar flow through two parallel porous disks, has been investigated when the flow is entirely due t injection or suction at the two disks. Viscous dissipation terms have been included in the energy equation and the uniform injection/suction velocities at the two disks, are assumed to be small. The boundaries are maintained at constant temperature. The variation of temperature and Nusselt numbers at the two disks, is shown graphically, for various of the injection/suction velocities.
| || Laminar Source Flow of Second Order Fluid Between two Parallel Coaxial Disks Rotating at Different Speeds
Author : Chaudhary, R.C.;Rajvanshi, S.C.
Source : Defence Science Journal ; Vol:24(1) ; 1974 ; pp 1-8
Subject : 532.542 Fluid Dynamics
Keywords : Parallel disks;Non-Newtonian parameters
Abstract : The laminar source flow of second order fluid between two infinite parallel disks rotating with different velocities has been studied in this paper. The solution has been obtained by double series expansion about a known solution at a large radius. The effect of non-Newtonian parameters has been discussed on velocity profiles for small rotational Taylor numbers of the disks.