Gas jet flows expanding into a space containing the same medium but at a significant temperature difference are of concern in many fields of engineering. One such example is the expansion of supersonic oxygen jets in the basic oxygen furnace (BOF) steelmaking process. While studying the characteristics of such gas jets, an interesting invariance of the local Mach number with the change in the surrounding temperature was found. The velocity and temperature of the jet at any given location increased with the increasing ambient temperature. However, the local Mach number remained the same for all ambient temperatures. This interesting result was further studied since there is no mention of it in any published literature. The reasons for these characteristics of the jet are analyzed in this paper. It is stressed that this finding is of practical importance and can be used in experimental studies of submerged gas jets expanding into environments with different ambient temperatures.
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Research Papers
On the Mach Number Invariance of Gas Jets Expanding Into Hot or Cold Environments
R. Sambasivam,
R. Sambasivam
Technology Group (Global Wires and Longs),
e-mail: rsambasivam@tatasteel.com
Tata Steel Ltd.
, Jamshedpur 831 001, India
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F. Durst
F. Durst
FMP Technology GmbH
, Am Weichselgarten 34, D-91058 Erlangen, Germany
Search for other works by this author on:
R. Sambasivam
Technology Group (Global Wires and Longs),
Tata Steel Ltd.
, Jamshedpur 831 001, Indiae-mail: rsambasivam@tatasteel.com
F. Durst
FMP Technology GmbH
, Am Weichselgarten 34, D-91058 Erlangen, GermanyJ. Heat Transfer. Mar 2010, 132(3): 031701 (8 pages)
Published Online: December 22, 2009
Article history
Received:
September 16, 2008
Revised:
August 6, 2009
Online:
December 22, 2009
Published:
December 22, 2009
Citation
Sambasivam, R., and Durst, F. (December 22, 2009). "On the Mach Number Invariance of Gas Jets Expanding Into Hot or Cold Environments." ASME. J. Heat Transfer. March 2010; 132(3): 031701. https://doi.org/10.1115/1.3222735
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