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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

MASS TRANSFER DOWNSTREAM OF A 90 DEGREE BEND IN A SQUARE DUCT

Get access (open in a dialog) DOI: 10.1615/IHTC11.2520
pages 115-120

Résumé

Mass (heat) transfer from walls of a square cross-section duct downstream of a 90 deg. bend is reported. The flow is turbulent and nearly fully developed. The concentration boundary layer is developing. Information obtained reveals effects of the stress and pressure driven vortices that render considerable spanwise variation in mass transfer coefficient on the walls of the duct. Variations from 30% above to 15% below the spanwise average over a short distance are observed. At a Reynolds number about 35000, the spanwise average mass transfer coefficient is 10-15% higher than that measured in the absence of the bend and it approaches a constant value in a short distance downstream of the leading edge. Mass transfer coefficients obtained with two adjacent walls active, versus one wall, show some reduction in mass transfer which is confined to the corner area. This effect is more pronounced at the inner corner region of the bend.