Ff. Hatay et al., NUMERICAL-SIMULATION OF SECONDARY FLOWS IN CHANNELS DRIVEN BY APPLIEDLORENTZ FORCES, Journal of thermophysics and heat transfer, 11(3), 1997, pp. 446-453
The effect of applied magnetohydrodynamic (Lorentz) forces on the flow
fields in saltwater plane channel flow has been investigated by perfor
ming large-scale computer simulations. Direct numerical simulations of
three-dimensional. time-dependent secondary how of an electroconducti
ng fluid driven by Lorentz forces caused by applied electromagnetic fi
elds have been performed, The computational model consists of a two-di
mensional doubly periodic configuration of magnet and electrode microt
iles flush-mounted on the lower surface of the channel. The resulting
flowfields for low Reynolds number simulations reveal that the applied
downward Lorentz force formed over the area between the magnet/electr
ode pairs causes the velocity perturbations to be confined to a very t
hin layer in the wall-normal direction, Thus, the design objective of
localizing the Lorentz force close to the Hall is achieved. Lateral co
mponents of the Lorentz force also contribute significantly to the for
mation of the secondary vortical flowfield, Simulations were also carr
ied out with a pulsatile Lorentz Force, The results show that this tec
hnique is a viable method of perturbing the how while reducing the pow
er consumption and corrosion of the microtiles.