NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 1 of 1036
Melt Motion Due to Peltier Marking During Bridgman Crystal Growth with an Axial Magnetic Field
Author and Affiliation:
Sellers, C. C.(Illinois Univ., Dept. of Mechanical and Industrial Engineering, Urbana, IL United States)
Walker, John S.(Illinois Univ., Dept. of Mechanical and Industrial Engineering, Urbana, IL United States)
Szofran, Frank R.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Motakef, Shariar(Cape Simulations, Inc., Newton, MA United States)
Abstract: This paper treats a liquid-metal flow inside an electrically insulating cylinder with electrically conducting solids above and below the liquid region. There is a uniform axial magnetic field, and there is an electric current through the liquid and both solids. Since the lower liquid-solid interface is concave into the solid and since the liquid is a better electrical conductor than the adjacent solid, the electric current is locally concentrated near the centerline. The return to a uniform current distribution involves a radial electric current which interacts with the axial magnetic field to drive an azimuthal flow. The axial variation of the centrifugal force due to the azimuthal velocity drives a meridional circulation with radial and axial velocities. This problem models the effects of Peltier marking during the vertical Bridgman growth of semiconductor crystals with an externally applied magnetic field, where the meridional circulation due to the Peltier Current may produce important mixing in the molten semiconductor.
Publication Date: Jan 01, 2000
Document ID:
20000074668
(Acquired Aug 11, 2000)
Subject Category: SOLID-STATE PHYSICS
Document Type: Preprint
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: SEMICONDUCTORS (MATERIALS); MAGNETIC FIELD CONFIGURATIONS; LIQUID-SOLID INTERFACES; CURRENT DISTRIBUTION; CRYSTAL GROWTH; AXES OF ROTATION; SOLIDS; RADIAL VELOCITY; LIQUID METALS; INSULATION; ELECTRIC CURRENT; CONDUCTORS; CENTRIFUGAL FORCE; AZIMUTH; BRIDGMAN METHOD
Availability Source: Other Sources
Availability Notes: Abstract Only
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 22, 2011
Contact Us