Turbulent Fluctuations and Heat Transfer for Separated Flow Associated With a Double Step at Entrance to an Enlarged Flat Duct

[+] Author and Article Information
N. Seki, S. Fukusako, T. Hirata

Department of Mechanical Engineering, Hokkaido University, Sapporo 060, Japan

J. Heat Transfer 98(4), 588-593 (Nov 01, 1976) (6 pages) doi:10.1115/1.3450605 History: Received March 16, 1976; Online August 11, 2010


An experimental study on heat-transfer in separated, reattached, and redevelopment regions behind a double step at entrance to a flat duct is presented. Measurements of turbulent fluctuation in a free shear layer are made by using a hot-wire anemometer. The experiments are carried out under a condition of uniform heat flux with the test fluid of air. Reynolds number ranges approximately from 4 × 103 to 2.5 × 105 and a step height ratio h/L is varied between 0.035 and 7.0. It is found that the heat-transfer rate in the separated region is closely connected with the behavior of transported heat to be represented by the product of velocity and temperature fluctuations in the free shear layer. An empirical equation is also proposed for the local Nusselt number in the separated and reattached regions.

Copyright © 1976 by ASME
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