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Paper   IPM / CMNL / 14881
Condensed Matter National Laboratory
  Title:   Rotation induced by uniform and non-uniform magnetic fields in a conducting fluid carrying an electric current
1.  R Shirsavar
2.  M Nasiri
3.  A Amjadi
4.  A Nejati
5.  S. O Sobhani
6.  Mehdi Habibi
  Status:   Published
  Journal: RSC Adv.
  Vol.:  6
  Year:  2016
  Pages:   112641-112645
  Publisher(s):   Royal Society of Chemistry
  Supported by:  IPM
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.

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