Vertical gradient freezing using submerged heater growth with rotation and with weak magnetic and electric fields

A. M. Holmes; X. Wang; Nancy Ma; D. F. Bliss; G. W. Iseler

doi:10.1016/j.ijheatfluidflow.2005.02.001

Vertical gradient freezing using submerged heater growth with rotation and with weak magnetic and electric fields

A. M. Holmes, X. Wang, Nancy Ma, D. F. Bliss, G. W. Iseler

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Investigations for the melt growth gallium-antimonide (GaSb) semiconductor crystals are underway at the US Air Force Research Laboratory at Hanscom Air Force Base by the vertical gradient freeze (VGF) method utilizing a submerged heater. Electromagnetic stirring can be induced in the gallium-antimonide melt just above the crystal growth interface by applying a weak radial electric current in the melt together with a weak axial magnetic field. A force convection in the melt can be induced by rotating the heater. This paper uses a Chebyshev spectral collocation method and investigates the effects of heater rotation and electromagnetic stirring on the melt motion during the VGF process using a submerged heater. Clockwise and counterclockwise rotations of the heater augment and opposes the flow induced by the electromagnetic stirring, respectively. The radial velocity along the crystal-melt interface is proportional to both the strength of the electromagnetic stirring and the clockwise rotation of the heater. A relatively low rotation rate in the clockwise direction significantly increases this radial velocity.

Original language	English
Pages (from-to)	792-800
Number of pages	9
Journal	International Journal of Heat and Fluid Flow
Volume	26
Issue number	5
DOIs	https://doi.org/10.1016/j.ijheatfluidflow.2005.02.001
State	Published - Oct 2005
Externally published	Yes

Funding

This research was supported by the US Air Force Office of Scientific Research under grant FA9550-04-1-0249 and by the NRC/USAF Office of Scientific Research Summer Faculty Fellowship Program. The calculations were performed on the Cray X1 and the SGI Origin 3000 Complex provided by the DoD High Performance Computing Modernization Program under grant AFSNH2487 and on the IBM pSeries 690 provided by the National Computational Science Alliance.

Funders	Funder number
National Computational Science Alliance
U.S. Department of Defense	AFSNH2487
Air Force Office of Scientific Research	FA9550-04-1-0249
International Business Machines Corporation
U.S. Air Force
National Research Council Canada

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10.1016/j.ijheatfluidflow.2005.02.001

Cite this

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title = "Vertical gradient freezing using submerged heater growth with rotation and with weak magnetic and electric fields",

abstract = "Investigations for the melt growth gallium-antimonide (GaSb) semiconductor crystals are underway at the US Air Force Research Laboratory at Hanscom Air Force Base by the vertical gradient freeze (VGF) method utilizing a submerged heater. Electromagnetic stirring can be induced in the gallium-antimonide melt just above the crystal growth interface by applying a weak radial electric current in the melt together with a weak axial magnetic field. A force convection in the melt can be induced by rotating the heater. This paper uses a Chebyshev spectral collocation method and investigates the effects of heater rotation and electromagnetic stirring on the melt motion during the VGF process using a submerged heater. Clockwise and counterclockwise rotations of the heater augment and opposes the flow induced by the electromagnetic stirring, respectively. The radial velocity along the crystal-melt interface is proportional to both the strength of the electromagnetic stirring and the clockwise rotation of the heater. A relatively low rotation rate in the clockwise direction significantly increases this radial velocity.",

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AU - Holmes, A. M.

AU - Wang, X.

AU - Ma, Nancy

AU - Bliss, D. F.

AU - Iseler, G. W.

PY - 2005/10

Y1 - 2005/10

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AB - Investigations for the melt growth gallium-antimonide (GaSb) semiconductor crystals are underway at the US Air Force Research Laboratory at Hanscom Air Force Base by the vertical gradient freeze (VGF) method utilizing a submerged heater. Electromagnetic stirring can be induced in the gallium-antimonide melt just above the crystal growth interface by applying a weak radial electric current in the melt together with a weak axial magnetic field. A force convection in the melt can be induced by rotating the heater. This paper uses a Chebyshev spectral collocation method and investigates the effects of heater rotation and electromagnetic stirring on the melt motion during the VGF process using a submerged heater. Clockwise and counterclockwise rotations of the heater augment and opposes the flow induced by the electromagnetic stirring, respectively. The radial velocity along the crystal-melt interface is proportional to both the strength of the electromagnetic stirring and the clockwise rotation of the heater. A relatively low rotation rate in the clockwise direction significantly increases this radial velocity.

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IS - 5

ER -

Vertical gradient freezing using submerged heater growth with rotation and with weak magnetic and electric fields

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