Computational validation of an isentropic plug nozzle design for gas atomisation
Computational validation of an isentropic plug nozzle design for gas atomisation
During high pressure gas atomisation (HPGA), the molten metal stream is disintegrated to produce spherical powders when energy is transferred from the gas to the melt. Conventional annular-slit nozzle (ASN) in close-coupled atomisation generates an under-expanded gas jet with characteristic shock waves which consume a great deal of energy through expansion. An isentropic plug nozzle (IPN) is developed in this paper to reduce the shocks and maximize kinetic energy being transferred from the gas to instablize the melt stream. The performance of the IPN is examined using a numerical model which includes gas flow dynamics, droplet break-up mechanism and particle tracking. The numerical results demonstrate a good improvement of gas dynamics and powder yield from the IPN design in comparison with the ASN, in particular when hot gas is employed.
CFD, metal powder, gas atomisation, plug nozzle, break-up
245-258
Zeoli, N.
bce8f101-8e08-4291-af2a-8ed2c2da7b5b
Gu, S.
a6f7af91-4731-46fe-ac4d-3081890ab704
1 April 2008
Zeoli, N.
bce8f101-8e08-4291-af2a-8ed2c2da7b5b
Gu, S.
a6f7af91-4731-46fe-ac4d-3081890ab704
Zeoli, N. and Gu, S.
(2008)
Computational validation of an isentropic plug nozzle design for gas atomisation.
Computational Materials Science, 42 (2), .
(doi:10.1016/j.commatsci.2007.07.013).
Abstract
During high pressure gas atomisation (HPGA), the molten metal stream is disintegrated to produce spherical powders when energy is transferred from the gas to the melt. Conventional annular-slit nozzle (ASN) in close-coupled atomisation generates an under-expanded gas jet with characteristic shock waves which consume a great deal of energy through expansion. An isentropic plug nozzle (IPN) is developed in this paper to reduce the shocks and maximize kinetic energy being transferred from the gas to instablize the melt stream. The performance of the IPN is examined using a numerical model which includes gas flow dynamics, droplet break-up mechanism and particle tracking. The numerical results demonstrate a good improvement of gas dynamics and powder yield from the IPN design in comparison with the ASN, in particular when hot gas is employed.
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Published date: 1 April 2008
Keywords:
CFD, metal powder, gas atomisation, plug nozzle, break-up
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Local EPrints ID: 54085
URI: http://eprints.soton.ac.uk/id/eprint/54085
ISSN: 0927-0256
PURE UUID: f3f377e8-f16d-4015-90b6-92f45a69cde4
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Date deposited: 04 Aug 2008
Last modified: 15 Mar 2024 10:44
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Author:
N. Zeoli
Author:
S. Gu
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