Particle image velocimetry and thermal measurements using thermocouples are used to measure the buoyant flow of a simplified full-scale model of an engine compartment. The engine block surface temperature and exhaust heaters are kept at about 100 and , respectively. Thermal measurements include enclosure surface temperature, temperature difference on the enclosure wall at midplane, engine block temperatures, and air temperatures under the hood. The highest surface temperatures were concentrated near the top of the enclosure around the exhaust heaters. This effect was due primarily to radiation from the exhaust heaters. Highest measured air temperature was about immediately above the right exhaust heater. The measured dominant flow structures are two larger counter rotating vortices over the top right side of the engine block and two counter rotating vortices over the top left side. These flow structures weaken considerably during the first 35 min of the transient cool down of the engine block and the exhaust heaters. Colder ambient air is sucked into the engine compartment at the vents near the bottom of the compartment with some exiting as hot air through the top slots. The time scale of the fluid exchange at the vents is in the order of seconds, indicating that this process is occurring very slowly.
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e-mail: parviz.merati@wmich.edu
e-mail: cdavis@mac-eng.com
e-mail: kuo-huey.chen@gm.com
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Underhood Buoyancy Driven Flow—An Experimental Study
Parviz Merati,
Parviz Merati
Department of Mechanical and Aeronautical Engineering,
e-mail: parviz.merati@wmich.edu
Western Michigan University
, 4601 Campus Drive, Kalamazoo, MI 49008-5343
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Charles Davis,
e-mail: cdavis@mac-eng.com
Charles Davis
MAC Engineering and Equipment Company
, 2775 Meadowbrook Road, Benton Harbor, MI 49002
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K.-H. Chen,
e-mail: kuo-huey.chen@gm.com
K.-H. Chen
General Motors Corporation
, 30500 Mound Road, MC: 480-106-256 Warren, MI 48090
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J. P. Johnson
J. P. Johnson
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Parviz Merati
Department of Mechanical and Aeronautical Engineering,
Western Michigan University
, 4601 Campus Drive, Kalamazoo, MI 49008-5343e-mail: parviz.merati@wmich.edu
Charles Davis
MAC Engineering and Equipment Company
, 2775 Meadowbrook Road, Benton Harbor, MI 49002e-mail: cdavis@mac-eng.com
K.-H. Chen
General Motors Corporation
, 30500 Mound Road, MC: 480-106-256 Warren, MI 48090e-mail: kuo-huey.chen@gm.com
J. P. Johnson
J. Heat Transfer. Aug 2011, 133(8): 082502 (9 pages)
Published Online: May 4, 2011
Article history
Received:
May 7, 2010
Revised:
March 3, 2011
Online:
May 4, 2011
Published:
May 4, 2011
Citation
Merati, P., Davis, C., Chen, K., and Johnson, J. P. (May 4, 2011). "Underhood Buoyancy Driven Flow—An Experimental Study." ASME. J. Heat Transfer. August 2011; 133(8): 082502. https://doi.org/10.1115/1.4003758
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