The Effect of Entrance Configuration on Local Heat-transfer Coefficients in Subsonic Diffusers

[+] Author and Article Information
E. O. Stoffel

Department of Mechanical Engineering, California Polytechnic State University, San Luis Obispo, Calif.

J. R. Welty

Department of Mechanical and Nuclear Engineering, Oregon State University, Corvallis, Ore.

J. Heat Transfer 94(4), 355-359 (Nov 01, 1972) (5 pages) doi:10.1115/1.3449951 History: Received August 24, 1971; Online August 11, 2010


The effects of square and reentrant entrances on flow regimes (no “appreciable” separation, large transitory stall, and fully developed two-dimensional stall) and local heat-transfer coefficients were determined with air flowing through a symmetrical, plane-wall, two-dimensional subsonic diffuser with one of the diverging walls heated and maintained isothermal. Flow and heat-transfer studies were made for the following ranges: 2θ = 0 to 45 deg, L/W = 6 to 18, and Re xtut = 4 × 104 to 3 × 105 . Results indicated that 2θ, L/W, and entrance configuration greatly affected the flow regime and heat transfer. Equations relating Um to Ut , Ur to Ut , and equations of the type Nu = C Pr 0.6 Re x0.8 are presented. For the configurations tested, heat-transfer rates were greater for reentrant than for square entrances.

Copyright © 1972 by ASME
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