Register to reply

Predicting Lorentz force fluid particle trajectories

by MagnetoBLI
Tags: fluid, lorentz, magneto
Share this thread:
Jan21-13, 05:26 PM
P: 43
I am trying to understand how the Lorentz force affects bulk fluid motion when I have an applied electric field (y-axis), applied magnetic field (x-axis) and bulk fluid velocity (z-axis), all orthogonal to each other.

I understand that if the fluid was at rest, an electrostatic force would generate a velocity in the y-axis, which would also generate a Lorentz force/velocity in the z-axis and form the cyclotron effect.

However, when the bulk fluid velocity in the z-axis exists, I presume this flow cannot be considered a moving charge (as both ions and electrons are travelling) and therefore the only moving charge is associated with the electric field. Instead a dynamo effect would take place such that the momentum force of the z-axis fluid flow would generate a current in the negative y-axis (should be negative in the image) and this current would in turn produce a force in the z-axis, thus accelerating the bulk fluid motion. Therefore the net effect would be to increase the radius of the cyclotron affect in the z-axis. Is this correct?

Could you tell me where the magnetic and electric field vectors should be to produce a force perpendicular to the bulk fluid motion (right schematic in the attachment)?

Any comments are much appreciated.

Attached Thumbnails
Particle trajectories.jpg  
Phys.Org News Partner Physics news on
Vibrational motion of a single molecule measured in real time
Researchers demonstrate ultra low-field nuclear magnetic resonance using Earth's magnetic field
Bubbling down: Discovery suggests surprising uses for common bubbles

Register to reply

Related Discussions
Particle trajectories Calculus & Beyond Homework 5
Lorentz force of a charged particle between moving parallel conductors Classical Physics 19
Alpha particle trajectories from Li disintegration Atomic, Solid State, Comp. Physics 2
Billiards - Predicting Optimal Trajectories? General Physics 7
Possible trajectories under central force and... Advanced Physics Homework 10