Magnetic fields, current densities, melt velocities and current efficiencies in Hall-Heroult cells: computations and comparison with measurements

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The magnetic fields, current densities, metal and electrolyte velocities, and current efficiencies within the Hall-Heroult cells used to produce aluminum have been predicted from first principles. The computation of current densities was carried out by solving Ohms law enabling the calculation of magnetic field vectors from the Biot-Savart law. The cross product of the current densities and magnetic fields then yielded the electromagnetic stirring forces acting on the molten metal and electrolyte. By employing a turbulence model and the time averaged Navier-Stokes equations, velocities within these two liquids could be calculated. Following this the mass flux of aluminum from the ... continued below

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Pages: 27

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Evans, J.W.; Zundelevich, Y.; Tarapore, E.D. & Sharma, D. March 1, 1979.

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  • Lawrence Berkeley Laboratory
    Publisher Info: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
    Place of Publication: Berkeley, California

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The magnetic fields, current densities, metal and electrolyte velocities, and current efficiencies within the Hall-Heroult cells used to produce aluminum have been predicted from first principles. The computation of current densities was carried out by solving Ohms law enabling the calculation of magnetic field vectors from the Biot-Savart law. The cross product of the current densities and magnetic fields then yielded the electromagnetic stirring forces acting on the molten metal and electrolyte. By employing a turbulence model and the time averaged Navier-Stokes equations, velocities within these two liquids could be calculated. Following this the mass flux of aluminum from the aluminum-electrolyte interface could be calculated using an equation due to Levich and subsequently the current efficiency predicted. Predicted field strengths and metal velocities within a 185 kiloamp cell were in approximate agreement with measured values.

Physical Description

Pages: 27

Notes

Dep. NTIS, PC A03/MF A01.

Source

  • Heat and mass transfer seminar on heat and mass transfer in metallurgical systems, Dubrovnik, Yugoslavia, 3 Sep 1979

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  • Report No.: LBL-8519
  • Report No.: CONF-790937-1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6017252
  • Archival Resource Key: ark:/67531/metadc1100849

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • March 1, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 24, 2018, 4:48 p.m.

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Evans, J.W.; Zundelevich, Y.; Tarapore, E.D. & Sharma, D. Magnetic fields, current densities, melt velocities and current efficiencies in Hall-Heroult cells: computations and comparison with measurements, article, March 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1100849/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.