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Forced convective heat transfer in curved diffusersMeasurements of the velocity characteristics of the flows in two curved diffusers of rectangular cross section with C and S-shaped centerlines are presented and related to measurements of wall heat transfer coefficients along the heated flat walls of the ducts. The velocity results were obtained by laser-Doppler anemometry in a water tunnel and the heat transfer results by liquid crystal thermography in a wind tunnel. The thermographic technique allowed the rapid and inexpensive measurement of wall heat transfer coefficients along flat walls of arbitrary boundary shapes with an accuracy of about 5 percent. The results show that an increase in secondary flow velocities near the heated wall causes an increase in the local wall heat transfer coefficient, and quantify the variation for maximum secondary-flow velocities in a range from 1.5 to 17 percent of the bulk flow velocity.
Document ID
19880032940
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rojas, J.
(Imperial Coll. of Science and Technology London, United Kingdom)
Whitelaw, J. H.
(Imperial College of Science and Technology London, United Kingdom)
Yianneskis, M.
(King's College London, United Kingdom)
Date Acquired
August 13, 2013
Publication Date
November 1, 1987
Publication Information
Publication: ASME, Transactions, Journal of Heat Transfer
Volume: 109
ISSN: 0022-1481
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
88A20167
Funding Number(s)
CONTRACT_GRANT: NASW-3631
Distribution Limits
Public
Copyright
Other

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