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Rotation induced by uniform and non-uniform magnetic fields in a conducting fluid carrying an electric current

Shirsavar, R ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1039/C6RA24346K
  3. Publisher: Royal Society of Chemistry , 2016
  4. Abstract:
  5. We study the dynamics of a conducting fluid carrying (i) a uniform current in the presence of a non-uniform magnetic field or (ii) carrying a non-uniform current in the presence of a uniform magnetic field, using particle image velocimetry (PIV). Our results show that the average angular velocity of the induced rotation has a power-law dependence on the electric current passing through the fluid with an exponent ≈2/3, in excellent agreement with our simulation results, for the same system. To explain the experimental observations we explore all possibilities for inducing rotation in a fluid carrying an electric current. Our theoretical discussion indicates two scenarios wherein applying electric/magnetic field on a current-carrying fluid produces rotational vortices: (i) applying a non-uniform magnetic field in the presence of an electric current and, (ii) applying a magnetic field in the presence of a non-uniform electric current. These two theoretical scenarios for inducing rotation by applying external fields agree well with our experimental observations and simulation results
  6. Keywords:
  7. Angular velocity ; Electric currents ; Excitons ; Magnetic fields ; Rotation ; Velocity measurement ; Conducting fluid ; External fields ; Non-uniform ; Nonuniform magnetic fields ; Particle image velocimetries ; Power-law dependences ; Uniform currents ; Uniform magnetic fields ; Magnetism
  8. Source: RSC Advances ; Volume 6, Issue 113 , 2016 , Pages 112641-112645 ; 20462069 (ISSN)
  9. URL: http://pubs.rsc.org/en/Content/ArticleLanding/2016/RA/C6RA24346K#!divAbstract