Mhd Definition and 21 Threads

According to the MHD theory, is case of energy production, a magnetic appplying a magnetic field to a moving charge perpendicular to the magnetic field, that could be plasma as well a solution full of ions, and placing two plates, electricity could be produced. Now I have a question, let's say...

Homework Statement:: Simualte the behaviour of water around an mhd inductive thruster Relevant Equations:: https://www.comsol.fr/paper/download/45837/Pintus.pdf Where can I start this simulation ? What is the required software ? [Mentor Note -- thread moved from the technical forums]

In order to build a small mhd propulsion ship for a physics project, I'm wondering if the magnets we find in hard drives carry enough magnetic field power to function in such an experiment.

So something weird just happened along the way in my experiment, here is a little background of what I'm doing. I have created a roughly 3x5mm inner diameter rectangular shaped channel for MHD liquid testing for one other project of mine, it's a simple conduction type MHD pump where the...

As per this wikipedia page, plasma is necessary for functioning of an MHD Generator. But, what I want to know is if just simple ionised gas is used instead of plasma, will the generator perform in the same way? As per my little knowledge of physics, there is no reason that it wouldn't. Because...

Hello everyone, I wanted to ask one question. My friend has a physics exam at school were the topic is to come up with a interesting yet simple physical device that would prove a single or multiple physics concepts. Now we were thinking that it would be interesting to experiment with the...

Homework Statement Prove that in an MHD equilibrium state in a pinch with flux and Bθ(r) and Bz(r), the equation for pressure is; d/dr(P + B2/8π) + Bθ2/4πr - ρ( u2θ/r)= 0 B is the total Magnetic field, uθ(r) the velocity of plasma, ρ= density, and solving in a (r,θ,z) system Homework...

Hi, Can anyone direct me to some literature that describes the numerical solution of full Maxwell's equations and Navier-Stokes equations for two-phase/multi-phase flows in coupled electric and magnetic fields. Thanks!

<Moderator's note: Moved from the homework forum.> Homework Statement The following equation is one of a few equations that describe a plasma model. The left hand side is the part I am having trouble with in that I can't seem to visualise what (V dot delV) actually does. My physics teacher has...

Hi! I wish to learn about MHD (Magnetic Hydro Dynamics). What book do you recommend? Roger

Hi everyone, What type of electrodes should I use for an AC saltwater MHD generator? I need something that is efficient yet corrosive resistant. Thanks

I have a question about the ideal equilibrium MHD equation: \vec{J} \times \vec{B} = \nabla p where \vec{J} is the current, \vec{B} is the magnetic field, and p is the plasma pressure. Does the magnetic field here represent the total magnetic field (any applied external fields plus...

I'm looking for a simulator for magnetism and fluid dynamics(with the objective of modeling atmospheric reentry), and was wondering if anyone knew of one(preferably free/open source). If anyone feels like searching(I couldn't find anything) the field is called magnetohydrodynamics. In the...

I am confused about the usual derivation of the ideal magnetohydrodynamic equations, as given for example here: http://theoretical-physics.net/dev/src/fluid-dynamics/mhd.html The problem is that there are a few different "currents" to consider. For example, in the momentum equation, the...

During the astrophyscial MHD class, I got a simple question on conversion of magnetic energy to plasma's kinetic energy and vice versa. When macroscopic magnetic force is exerted on a chunk of conducting fluid, we say work is done by B-field and magnetic potential energy is converted into...

Are there any people actively doing research in MHD topics these days? It seems like an interesting field, but all the information I've come across only dates as recent as the early 1990's. What happened? :confused:

Can someone give me an intuitive explanation why plasmas or conductive fluids tend to follow magnetic flux lines? E.g. http://en.wikipedia.org/wiki/Magnetohydrodynamics" entry on this says: If I take a stab at a qualitative explanation, is it because magnetic flux lines are equipotential...

Is this the right format of the energy equation (equation 2.10)? http://www-solar.mcs.st-and.ac.uk/~alan/sun_course/Chapter2/node3.html#energy \frac{\rho^\gamma}{\gamma-1}\frac{D}{Dt}\left(\frac{p}{\rho^\gamma}\right)=-L I know it in a different format: \frac{dp}{dt}+\gamma...

Homework Statement Two of the MHD equations can be written as \vec{E} + \vec{v} \times \vec{B} = \eta \vec{J} \vec{\nabla} \times \vec{B} = \mu_0 \vec{J} where [itex]\eta[/tex] is the resistivity of the plasma. Derive an expression for the magnetic field at a very high resistivity...

When I have an ionized fluid (plasma) and I describe it in a continuum approach I can use the MHD equations (the continuity equation, the equation of motion, the induction equation and the energy equation). However; I am modeling a certain model of a sunspot and there is also an unionized...

hi i would like some journals/references on "MHD Propulsion" please try to get it in ebook format...if not possible nytin else will do but please avoid asking me to buy it. thanx