91292 - Electromagnetism and Magnetofluid-dynamics M

Learning outcomes

The course aims to deepen the study of electromagnetism, with reference to electrostatics, the quasi-stationary and non-stationary regime, of interest for electrical engineering. Then the interaction between electrodynamics and fluid-dynamics is analyzed. The motion of charged particles and ionized gases in the electromagnetic field is examined. The diffusive, convective and convective-diffusive magneto-fluid-dynamic regimes are considered. We will then examine the engineering aspects of the magnetofluidodynamic interaction with supersonic and hypersonic flows, the EHD interaction, and the controlled magnetic confinement thermonuclear fusion engineering.

Course contents

The course aims to deepen the study of Electromagnetism and provide knowledge of some basic phenomena of it. Then the motion of charged particles and ionized gases in electromagnetic and fluid dynamic fields is considered. The iteration of electrodynamics and fluid dynamics is therefore considered.

The program consists of the following points:

• Quantities and laws of Ectromagnetism (EM)
  
• Scalar potential and vector potential
• Insulating materials, conductors and semiconductors
• Calculation of the electromagnetic forces
• Poynting theorem
• Non-stationary electrodynamics
• Delayed potentials and electromagnetic waves
• Quasi-stationary approximation and circuit theory approximation
• Diffusion equation
• Skin effect in sinusoidal regime
• Motion of a charged particle in an EM field
• Invariance of the magnetic moment of a charged particle in a slowly variable magnetic field
• Magnetic mirrors
• Ionized gases and interactions between their particles
• Radiation processes in a plasma
• Thermodynamic equilibrium in plasmas
• Debye length and plasma frequency
• Plasma sheaths in plasma
• Electric conductivitry and Hall parameter: Ohm-Hall law
• MHD approximation and plasma magnetic regimes
• Magnetic Reynolds number, magnetic interaction and Hartmann parameter
• Magneto-Hydro-Dynamic Interaction (MHD)
• The discharge in gases
• Dielectric barrier discharge (DBD discharge) and Electro-Hydro-Dynamic interaction (EHD)
• Magnetically confined thermonuclear fusion

The course is carried out in a single module.

Readings/Bibliography

The complete series of slides of the course, are the course notes available at the teacher's website (http://www.die.ing.unibo.it/pers/borghi/carlo.htm). The recommended texts for consultation and details are:

• Julius Adams Stratton, “Electromagnetic Theory”, McGraw Hill, 1941
• J.D. Jackson, "Classical Electrodynamics", John Wiley and Sons, New York, 1975
• L. Spitzer, "Physics of Fully Ionized Gases", Interscieces, 1962
• R.J. Rosa, "Magnetohydrodynamic Energy Conversion", McGraw Hill, 1968
• M. Mitchner and C.H. Kruger, "Partially Ionized Gases", John Wiley and Sons, New York, 1973.
• J.R. Roth, "Industrial Plasma Engineering", Institute of Physics Publishers, Philadelphia, 1995-2000

Teaching methods

The course will be held by lectures given by the teacher who will use  a slide show.

Assessment methods

The exam is oral. Every Tuesday the exam be done by appointment with the teacher through an e-mail (ca.borghi@unibo.it).

Teaching tools

The slides projected during the lessons are the course notes. A pdf version of them are available on the teacher's website (http://www.die.ing.unibo.it/pers/borghi/carlo.htm).

Office hours

See the website of Carlo Angelo Borghi