Entrainment by a Refrigerated Air Curtain Down a Wall

[+] Author and Article Information
Pratik Bhattacharjee, Eric Loth

Department of Aeronautical and Astronautical Engineering, University of Illinois Urbana Champaign, 104 S Wright St., Urbana, IL 61801

J. Fluids Eng 126(5), 871-879 (Dec 07, 2004) (9 pages) doi:10.1115/1.1792263 History: Received March 04, 2003; Revised March 02, 2004; Online December 07, 2004
Copyright © 2004 by ASME
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Smoke injection visualization of the air-curtain for a refrigerated display-case where the smoke is injected at the cold-air jet at the top of the curtain. The diffusion of the jet shows the ambient air entrainment into the air curtain and at the bottom the spillover of injected air can be seen 6.
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Air curtain idealized as a wall jet with a uniform inflow profile and a uniform co-flowing stream
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Wall jet grid showing (a) close-up near inflow and (b) overall domain
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Instantaneous temperature contours with parabolic inflow for (a) Re=700, (b) Re=1000, and (c) Re=2000
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Instantaneous thermal entrainment at x/H=10 with uniform, parabolic, and ramp inflow for (a) Re=700, (b) Re=1000, and (c) Re=2000
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The instantaneous thermal entrainment at x/H=10 at Re=2000: 3-D versus 2-D
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Instantaneous thermal entrainment versus time for various velocity profiles x/H=10 and for Re=2000
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Time variation of thermal entrainment for Reynolds number of 2000 at three various streamwise stations
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Thermal entrainment as a function of Reynolds number at x/H=10 and 20
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Co-flow effects: thermal entrainment variation with Reynolds number
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Variation of the thermal entrainment with Richardson number for parabolic flow at Re=2000 for two different streamwise locations
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Variation of the convective thermal energy loss with the Reynolds number for a jet with parabolic inflow at x/H=20



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