Investigation of differential diffusion in turbulent jet flows using planar laser Rayleigh scattering

Journal Article · Thu Dec 01 00:00:00 EST 2005 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2005.08.029· OSTI ID:20681474

Dibble, Robert W ^[1]; Long, Marshall B ^[2]

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1. Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720 (United States)
2. Department of Mechanical Engineering, Yale University, New Haven, CT 06520-8284 (United States)

A series of laser Rayleigh-scattering experiments has been performed to investigate the effects of differential molecular diffusion in turbulent nonreacting jet flows. A turbulent jet of a mixture of Freon and H{sub 2} exiting into coflowing air was studied at various Reynolds numbers. In laminar flow, Rayleigh scattering clearly showed H{sub 2} diffusing ahead of Freon. In turbulent flow, the instantaneous Rayleigh images showed differential diffusion at the many interfaces between jet fluid and entrained air. Yet, ensemble averages of instantaneous images showed no average diffusion of H{sub 2} ahead of Freon.

• OSTI ID: 20681474
• Journal Information: Combustion and Flame, Vol. 143, Issue 4; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
TURBULENT FLOW
JETS
DIFFUSION
FREONS
HYDROGEN
AIR
REYNOLDS NUMBER