Deceleration Rate Parameter and Algebraic Prediction of Turbulent Boundary Layer

[+] Author and Article Information
Y. Senoo

Research Institute of Industrial Science, Kyushu University, Fukuoka, Japan

M. Nishi

Department of Mechanical Engineering, Kyushu Institute of Technology, Tobata, Kitakyushu, Japan

J. Fluids Eng 99(2), 390-394 (Jun 01, 1977) (5 pages) doi:10.1115/1.3448771 History: Received August 11, 1976; Online October 12, 2010


The deceleration rate θ1 /λ, which is defined as the ratio of the momentum thickness to the distance where the free-stream velocity is reduced by 10 percent, is shown as an important and handy parameter to describe the development of turbulent boundary layer in an adverse pressure gradient. Using this parameter a simple calculation procedure of turbulent boundary layer is presented. In order to achieve a large inlet/exit velocity ratio, θ1 /λ =0.02 may be recommended, where the influence of wall friction on the development of momentum loss is very small and the shape factor of boundary layer does not increase rapidly.

Copyright © 1977 by ASME
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