Begell House Inc.
International Journal of Fluid Mechanics Research
FMR
2152-5102
37
4
2010
Pressure Drop Prediction for the Flow of Fly Ash Slurries Through Pipes At High Concentrations
295-304
Abhai Kumar
Verma
Kamla Nehru Institute of Technology; Civil Engineering Department, Bundelkhand Institute of Engineering and Technology, Jhansi, (UP), India
S. N.
Singh
Department of Applied Mechanics, IIT Delhi Hauz Khas, New Delhi, India
V.
Seshadri
Department of Applied Mechanics, IIT Delhi Hauz Khas, New Delhi, India
Two approaches to evaluate pressure drop for non-Newtonian slurries at high concentrations have been evaluated by the comparison with the data for fly ash slurries. The first approach involves the pilot plant test data and the second approach involves the choice of semi-empirical pressure drop correlations based on rheometric data. Finally both approaches are compared in quantitative terms. The variation in the results is within the permissible limits. Hence the second approach can be adopted by the slurry pipeline designers instead of resorting to the extensive pilot plant tests which is tedious, time consuming, uneconomical and complex in nature.
Mathematical Modeling of Pulsatile Blood Flow and Heat Transfer Characteristics in Stenosed Artery
305-324
Gaurav
Varshney
Government Degree College Karanprayag India
V. K.
Katiyar
Department of Mathematics, Indian Institute of Technology, Roorkee, Uttarakhand, India
Sushil
Kumar
Department of Mathematics, S. V. National Institute of Technology, Surat
In the present study, a mathematical model for the pulsatile blood flow and temperature distribution in stenosed artery is developed. Blood is assumed as a laminar, incompressible, fully developed, non-Newtonian flow characterized by power low model. A numerical solution using finite difference method that considers the fully coupled Navier−Stokes and energy equations is used for the simulations. The blood flow and effects of external heating and cooling on the temperature distribution inside artery is graphically presented and discussed.
On the Unsteady Wake for Flow Past Transversally Vibrating Square Cylinder
325-342
Pratish P.
Patil
John F. Welch Technology Centre GE India, Bangalore-560066
Shaligram
Tiwari
Department of Mechanical Engineering, Indian Institute of Technology Madras Chennai, India,
600036
Numerical investigations are carried out to study the behavior of near wake flow for flow past a transversally vibrating square cylinder using developed computational code. Two-dimensional computational study is conducted over a range of frequencies of cylinder vibration. The nature of vortex shedding is found to be contingent of the frequency of excitation of the cylinder and observed to vary characteristically. The temporal evolution of the unsteady wake is presented. The unsteady forces on the vibrating square cylinder are computed and are compared with those on a stationary square cylinder. Further results include dependence of vorticity fields as well as of wake Strouhal number on frequency of excitation of the vibrating cylinder. In addition, a comparison between drag forces for flow past transversely vibrating square and circular cylinders for similar amplitude and frequency of cylinder vibration has been presented as a validation of the tested computational code.
Curvature Effects on the Instabilities of Batchelor Rotating Disk Flows
343-358
Sebastien
Poncet
Laboratoire M2P2, UMR CNRS 7340 Aix-Marseille Universite / CNRS 38, rue Frederic Joliot-Curie 13451 MARSEILLE Cedex 13
Marie-Pierre
Chauve
Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), UMR CNRS 6594, Technopôle Château Gombert, 49 rue F. Joliot-Curie, B.P.146, 13384 Marseille Cedex 13 − France
The stability of a Batchelor flow enclosed between a stationary and a rotating disk with a central hub is investigated by extensive experimental visualizations and direct numerical simulations. The first instability appears as circular rolls (CR), which propagate along the stator towards the rotation axis. Above a second threshold, spiral rolls (SRI) appear at the periphery of the cavity due to the destabilization of the boundary layer along the external cylinder. These spirals coexist with the circular rolls in the experiment. For the first time, the presence of an inner rotating hub, which is of major industrial importance, measured by the influence of the curvature parameter has been studied experimentally. This parameter strongly modifies the wave number of the instabilities as well as the angle of the spirals. Finally, for a given geometry, a very good agreement on the characteristics of these instabilities is obtained between the experimental and numerical approaches.
Influence of Various Internal Components on Slosh Dynamics: A Study Using Finite Element Method
359-381
S
Mitra
National University of Singapore, department of Mechanical Engineering
B. C.
Khoo
Department of Mechanical Engineering National University of Singapore, Singapore 117576
Arun
Kumar
Department of Aerospace Engineering, IIT Kharagpur Kharagpur-721302, West Bengal, India
K. P.
Sinhamahapatra
Aerospace Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India
The dynamic behavior of liquids in moving containers is a fascinating subject that has attracted the attention of geophysicists, seismologists, engineers, mathematicians and other scientific workers for many years. One of the design issues of the liquid-tank system is the sloshing phenomenon where internal fluid may result in severe damage to the containment system. The slosh dynamics of liquid storage tanks can be strongly influenced by the presence of internal submerged components. The internal components can modify the dynamic characteristics of the liquid tank systems to an advantage. The use of baffles as anti-slosh device is a quite well known example. The baffles cause a variation in the fundamental frequency of liquid oscillations by effectively changing the tank geometry. This paper describes the numerical assessment of lateral sloshing forces developed within liquid filled tanks with various internal components. The main contribution in this paper is that how the slosh dynamics of liquid filled container gets affected due to presence of multiple submerged block and baffle over a partition wall which is still dearth in open literature.
On Some Transformations and Approximations of Magnetohydrodynamic Equations
382-389
Igor T.
Selezov
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Zhelyabov St., 8/4, Kyiv, 03680, MSP, Ukraine
Investigations related to some hidden symmetry properties of the system of differential equations of magnetohydrodynamics (MHD) are presented. The MHD-equations of a finite electrical conductivity characterized by the magnetic Reynolds number Rem are considered. Each model under consideration is characterized some hidden geometric and physical symmetry. As a result, it makes it possible to simplify the original model: decomposition, introduction of potentials or new variables, self-similarity et al. The MHD-system for magneto-isotropic compressible fluid under the action of a magnetic field is considered and nondi-mensionalized. It is shown that in the case of one-dimensional nonlinear motion the original system can be reduced to some simplified form. In the case of linearized equations the self-similarity analysis is applied allowing to obtain the system in which the value Rem is not involved explicitly. Approximations of a weak and high Rem are developed leading to hierarchy systems. The introduction of potentials leading to some cases of solvability is presented.