The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform
O Lielausis - One of the best experts on this subject based on the ideXlab platform.
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the behaviour of gas bubbles in a turbulent liquid metal Magnetohydrodynamic Flow part ii magnetic field influence on the slip ratio
International Journal of Multiphase Flow, 2000Co-Authors: S Eckert, G Gerbeth, O LielausisAbstract:Abstract The influence of a steady, homogeneous magnetic field on the slip ratio in a liquid metal bubbly Flow is investigated. A one-dimensional model has been developed describing the motion of a multitude of bubbles in a Magnetohydrodynamic Flow. Calculations are presented for magnetic fields directed transverse or parallel to the mean Flow direction. While in the longitudinal case the slip decreases monotonously with the growing magnetic field, it also decreases initially, passes a minimum and increases again if B → is directed transverse to the Flow. In order to validate the theoretical predictions, experiments are performed in liquid metal Flows exposed to a transverse or a longitudinal magnetic field.
B. S. Dandapat - One of the best experts on this subject based on the ideXlab platform.
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Magnetohydrodynamic Flow of a power law fluid over a stretching sheet
International Journal of Non-linear Mechanics, 1992Co-Authors: Helge I Andersson, Knut H Bech, B. S. DandapatAbstract:Abstract Magnetohydrodynamic Flow of an electrically conducting power-law fluid over a stretching sheet in the presence of a uniform transverse magnetic field is investigated by using an exact similarity transformation. The effect of magnetic field on the now characteristics is explored numerically, and it is concluded that the magnetic field tends to make the boundary layer thinner, thereby increasing the wall friction.
S Eckert - One of the best experts on this subject based on the ideXlab platform.
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the behaviour of gas bubbles in a turbulent liquid metal Magnetohydrodynamic Flow part ii magnetic field influence on the slip ratio
International Journal of Multiphase Flow, 2000Co-Authors: S Eckert, G Gerbeth, O LielausisAbstract:Abstract The influence of a steady, homogeneous magnetic field on the slip ratio in a liquid metal bubbly Flow is investigated. A one-dimensional model has been developed describing the motion of a multitude of bubbles in a Magnetohydrodynamic Flow. Calculations are presented for magnetic fields directed transverse or parallel to the mean Flow direction. While in the longitudinal case the slip decreases monotonously with the growing magnetic field, it also decreases initially, passes a minimum and increases again if B → is directed transverse to the Flow. In order to validate the theoretical predictions, experiments are performed in liquid metal Flows exposed to a transverse or a longitudinal magnetic field.
Salah Saouli - One of the best experts on this subject based on the ideXlab platform.
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entropy analysis for viscoelastic Magnetohydrodynamic Flow over a stretching surface
International Journal of Non-linear Mechanics, 2010Co-Authors: Soraya Aiboud, Salah SaouliAbstract:Abstract This paper presents the application of the second law analysis of thermodynamics to viscoelastic Magnetohydrodynamic Flow over a stretching surface. The velocity and temperature profiles are obtained analytically using the Kummer's functions and used to compute the entropy generation number. The effects of the magnetic parameter, the Prandtl number, the heat source/heat sink parameter and the surface temperature parameter on velocity and temperature profiles are presented. The influences of the same parameters, the Hartmann number, the dimensionless group parameter and the Reynolds number on the entropy generation are also discussed.
S Molokov - One of the best experts on this subject based on the ideXlab platform.
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linear stability of Magnetohydrodynamic Flow in a perfectly conducting rectangular duct
Journal of Fluid Mechanics, 2012Co-Authors: Jānis Priede, Svetlana Aleksandrova, S MolokovAbstract:following the jets becomes confined in the layers of characteristic thickness Ha 1=2 located at the walls parallel to the magnetic field. In this case the instability is determined by ; which results in both the critical Reynolds number and wavenumber scaling as 1 : Instability modes can have one of the four different symmetry combinations along and across the magnetic field. The most unstable is a pair of modes with an even distribution of vorticity along the magnetic field. These two modes represent strongly non-uniform vortices aligned with the magnetic field, which rotate either in the same or opposite senses across the magnetic field. The former enhance while the latter weaken one another provided that the magnetic field is not too strong or the walls parallel to the field are not too far apart. In a strong magnetic field, when the vortices at the opposite walls are well separated by the core Flow, the critical Reynolds number and wavenumber for both of these instability modes are the same: Rec 642Ha 1=2 C 8:9 10 3 Ha 1=2 and kc 0:477Ha 1=2 : The other pair of modes, which differs from the previous one by an odd distribution of vorticity along the magnetic field, is more stable with an approximately four times higher critical Reynolds number.
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linear stability of Magnetohydrodynamic Flow in a perfectly conducting rectangular duct
arXiv: Fluid Dynamics, 2011Co-Authors: Jānis Priede, Svetlana Aleksandrova, S MolokovAbstract:We analyse numerically the linear stability of a liquid metal Flow in a rectangular duct with perfectly electrically conducting walls subject to a uniform transverse magnetic field. A non-standard three dimensional vector stream function/vorticity formulation is used with Chebyshev collocation method to solve the eigenvalue problem for small-amplitude perturbations. A relatively weak magnetic field is found to render the Flow linearly unstable as two weak jets appear close to the centre of the duct at the Hartmann number Ha \approx 9.6. In a sufficiently strong magnetic field, the instability following the jets becomes confined in the layers of characteristic thickness \delta \sim Ha^{-1/2} located at the walls parallel to the magnetic field. In this case the instability is determined by \delta, which results in both the critical Reynolds and wavenumbers numbers scaling as \sim \delta^{-1}. Instability modes can have one of the four different symmetry combinations along and across the magnetic field. The most unstable is a pair of modes with an even distribution of vorticity along the magnetic field. These two modes represent strongly non-uniform vortices aligned with the magnetic field, which rotate either in the same or opposite senses across the magnetic field. The former enhance while the latter weaken one another provided that the magnetic field is not too strong or the walls parallel to the field are not too far apart. In a strong magnetic field, when the vortices at the opposite walls are well separated by the core Flow, the critical Reynolds and wavenumbers for both of these instability modes are the same: Re_c \approx 642Ha^{1/2}+8.9x10^3Ha^{-1/2} and k_c \approx 0.477Ha^{1/2}. The other pair of modes, which differs from the previous one by an odd distribution of vorticity along the magnetic field, is more stable with approximately four times higher critical Reynolds number.