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1
Content available Effect of induced magnetic field on MHD mixed convection flow in vertical microchannel
Jha B. K., Aina B.
International Journal of Applied Mechanics and Engineering
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2017
|
Vol. 22, no. 3
567--582
EN
The present work presents a theoretical investigation of an MHD mixed convection flow in a vertical microchannel formed by two electrically non-conducting infinite vertical parallel plates. The influence of an induced magnetic field arising due to motion of an electrically conducting fluid is taken into consideration. The governing equations of the motion are a set of simultaneous ordinary differential equations and their exact solutions in dimensionless form have been obtained for the velocity field, the induced magnetic field and the temperature field. The expressions for the induced current density and skin friction have also been obtained. The effects of various non-dimensional parameters such as rarefaction, fluid wall interaction, the Hartmann number and the magnetic Prandtl number on the velocity, the induced magnetic field, the temperature, the induced current density, and skin friction have been presented in a graphical form. It is found that the effect of the Hartmann number and magnetic Prandtl number on the induced current density is found to have a decreasing nature at the central region of the microchannel.
2
Content available Unsteady hydromagnetic Couette flow due to ramped motion of one of the porous plates
Jha B. K., Jibril H. M.
International Journal of Applied Mechanics and Engineering
|
2013
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Vol. 18, no. 4
1039--1056
EN
An unsteady flow formation in Couette motion of an electrically conducting fluid subject to transverse magnetic field has been analyzed in the presence of suction/injection through the porous plates when one of the porous plates is in ramped motion. It is assumed that the porous plates are uniformly permeable and the fluid is entering the flow region through one of the porous plates at same rate as it is leaving through the other porous plate. The resulting boundary value problem has been solved exactly under the assumption of a negligible induced magnetic field, external electric field and pressure gradient. Unified closed form expressions for the velocity field and skin-friction corresponding to the case of a magnetic field fixed relative to the fluid or to the moving porous plate have been presented. In order to highlight the impact of the ramp motion of the porous plate on the fluid flow, it has also been compared with Couette flow between porous plates when one of the porous plates has been set into an impulsive motion.
3
Content available remote Time dependent MHD Couette flow due to ramped motion of one of the boundaries
Jha B. K., Jibril H. M.
International Journal of Applied Mechanics and Engineering
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2012
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Vol. 17, no. 2
383-399
EN
The effects of a transverse magnetic field on the Couette flow of an electrically conducting fluid between two infinite parallel plates have been discussed when one of the plates has been set into ramped motion. Under the assumption of a negligible induced magnetic field and applied magnetic field being fixed relative to the fluid or moving plate, the governing momentum equation has been solved exactly. The expressions for velocity field and skin-friction have been presented. The transient features of velocity and skin-friction have been discussed for different values of the Hartmann number. It is seen that the velocity field and skin-friction increases with an increase of the Hartman number when the magnetic field is fixed with respect to the moving plate while the result is just reverse when it is fixed with respect to the fluid.
4
Content available remote Modelowanie łuku spawalniczego o kolumnie sterowanej poprzecznym polem magnetycznym
Sawicki A.
Biuletyn Instytutu Spawalnictwa w Gliwicach
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2012
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R. 56, nr 2
44-50
PL
Wskazano na możliwe korzyści technologiczne wynikające z oddziaływania poprzecznego pola magnetycznego na łuk spawalniczy. Opisano efekty fizyczne powstające podczas odchylania kolumny łukowej. Dokonano przeglądu modeli i charakterystyk łuku w stałym, zmiennym, jednorodnym i niejednorodnym polu magnetycznym uformowanym przez wzbudnik indukcyjny. Zaproponowano strukturę układu sterowania urządzenia wykonującego proces technologiczny za pomocą odchylanego łuku elektrycznego.
EN
The study indicates possible technological benefits of the influence of transverse magnetic fields on welding arcs. Physical effects occurring during arc column deflection have been described. A review of models and characteristics of the arc in constant, variable, homogeneous and inhomogeneous magnetic fields formed by the inductor has been done. The structure of the control system of the device used for conducting technological processes by means of transverse magnetic field has been proposed.
5
Content available remote Hydromagnetic flow due to ramped motion of the boundary
Jha B. K., Jibril H. M.
International Journal of Applied Mechanics and Engineering
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2010
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Vol. 15, no 4
1101-1109
EN
The unsteady flow of a viscous, incompressible and electrically conducting fluid subject to a uniform transverse magnetic field near a horizontal plate having ramped motion is considered. A unified closed form analytical solutions have been obtained for the velocity field and the skin-friction corresponding to the cases of a magnetic field fixed relative to the fluid or the moving boundary. Under the assumption of a negligible induced magnetic field, the governing momentum equation has been solved exactly by using the Laplace-transform technique. The flow formation near ramped motion of the plate has also been compared with the flow formation near a plate having constant motion (impulsive motion). It is observed that velocity of the fluid in the case of ramped motion of the plate is always less than that of the flow induced by impulsive motion of the plate.
6
Content available remote Próżniowy łuk łączeniowy niskiego napięcia w poprzecznym polu magnetycznym, proporcjonalnym do prądu łuku
Klajn A.
Przegląd Elektrotechniczny
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2007
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R. 83, nr 2
95-101
PL
Przedstawiono wyniki eksperymentalnych badań parametrów łuku próżniowego niskiego napięcia palącego się w poprzecznym polu magnetycznym, wytworzonym w zewnętrznym układzie cewek zasilanych prądem badanego łuku. Wartości prądu zmieniano w zakresie od 200A do 600 A, a wartości indukcji magnetycznej zawierały się w zakresie od 75 mT do 226 mT. Badano przyrost napięcia łuku oraz ruch jego plazmy. Nie stwierdzono wyłączeń prądu wskutek oddziaływania pola magnetycznego jako jedynego czynnika oddziałującego na plazmę łuku próżniowego.
EN
The paper presents results of experimental analysis of the low-voltage vacuum arc parameters. The arc burned in a transverse magnetic field, which was produced in an external coil set, supplied with the current of the examined arc. The arc current was changed in the range from 200A up to 600 A and the corresponding to it values of magnetic flux density were in the range from 75 mT up to 226 mT. The increase of the arc voltage and arc plasma movement was observed. No current interruption as the result of only magnetic field action on the arc plasma was observed.
7
Content available remote Laser-produced plasma for simulation of plasma jets propagation in geoplasma.
Wołowski J., Parys P., Woryna E., Zakharov Y.P., Orishich A.M., Eremin A.V.
Optica Applicata
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2000
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Vol. 30, nr 1
61-67
EN
This work presents the results concerning dynamics of laser-produced plasma streams from a flat target placed in a transverse magnetic field of B/sub 0/[left angle bracket]0.9 T which were obtained during joint experiments carried out at IPPLM. They include data about main stages of plasma-field interaction, creation of the diamagnetic cavity, plasma deceleration and heating, and transformation of kinetic energy into electromagnetic one. Institution
8
Content available remote Investigation of dynamic and stability of laser-produced plasma in strong external magnetic field.
Pisarczyk T., Kasperczuk A., Miklaszewski R., Zakharov Y.P.
Optica Applicata
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2000
|
Vol. 30, nr 1
41-59
EN
The paper presents results of studies of the behaviour of a laser-produced plasma in strong external axial and transverse magnetic field of 5-20 T in induction generated from a flat teflon target at the laser power densities of about 10/sup 14/ Wcm/sup -2/. The investigations were carried on by means of three-frame interferometry and a non-contact magnetic probe, the so-called remote magnetic probe (RMP). The dynamics of the process of creation of the diamagnetic cavity, its shape and dimensions have been determined. Also computer simulation of plasma expansion by a 2D MHD code was made.
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