NDLI: A Modified Entrainment Theory for the Prediction of Turbulent Boundary Layer Growth in Adverse Pressure Gradients

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nicoll, W. B. Ramaprian, B. R.
Copyright Year	1969
Abstract	An approach based on the “entrainment” theory is presented as a tool for the prediction of turbulent boundary layer growth in adverse pressure gradients. The rate of entrainment of free-stream fluid by the boundary layer is assumed to be a unique function of the shape factor. A two parameter velocity profile has been assumed, which reduces to the Spalding [24] profile for zero pressure gradient flows and to the half-power profile of Stratford [26] for separating flows. The integral equations of continuity and momentum are solved with the above empirical input to predict the growth of the boundary layer parameters, both in two-dimensional and axisymmetric flows. The predictions are compared with some of the available experimental data in both the cases. The technique is found to give improved predictions compared with those of previous methods. Results in the case of conical diffusers indicate that the theory predicts slightly higher shape factors than actual, especially in the far downstream portions of the diffuser and thus furnishes a slightly conservative method for design.
Starting Page	649
Ending Page	655
Page Count	7
File Format	PDF
ISSN	00982202
e-ISSN	1528901X
Journal	Journal of Fluids Engineering
Volume Number	91
Issue Number	4
DOI	10.1115/1.3571205
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	1969-12-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Boundary layer turbulence Boundary layers Design Diffusers Flow (Dynamics) Fluids Integral equations Momentum Pressure gradient Shapes
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering

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