Physics Department

 By Samia Salem

MHD science study the effect of electromagnetic field on the conducting fluid especially the effect of magnetic field on these fluid. MHD intersted by two factors , the first, when the magetic field pass through the conducting fluid the induced current through the fluid produce the magnetic field which cancel the applied field  and these field called frozen  magnetic field.

the second, when the conducting fluid pass through the magnetic field the lines of  field out side the fluid and the  induced current which result from the fluid produce magnetic field and these field reinforcement the applied field.      

the force which result from these field called lorentz force and these force equal JXB. J called the current density and equal the conductivity multiplied by the magnetic induction (B) and the velosity of the fluid.

the equations which uses in these science are the conservation of momentum and mass and also maxwell equations.

MHD used in many application such as the studying of plasma,engenering science,accelerator,power generator and the studying of polymers such as polymer solution and polymer melts.MHD used also in stdying of the propertisese of the blood.by using MHD we can knew any defect in the blood  such as clotting and bleeding and also we able to cure these defect.