Closure to “Discussion of ‘Calculation of Interacting Turbulent Shear Layers: Duct Flow’” (1973, ASME J. Fluids Eng., 95, p. 220)

1973 ◽  
Vol 95 (2) ◽  
pp. 220-220
Author(s):  
P. Bradshaw ◽  
R. B. Dean ◽  
D. M. McEligot
Keyword(s):  
Shear Layers ◽  
Turbulent Shear ◽  
Duct Flow

Calculation of Interacting Turbulent Shear Layers: Duct Flow

1973 ◽  
Vol 95 (2) ◽  
pp. 214-219 ◽  
Author(s):  
P. Bradshaw ◽  
R. B. Dean ◽  
D. M. McEligot
Keyword(s):  
Boundary Layer ◽  
Shear Stress ◽  
Calculation Method ◽  
Shear Layers ◽  
Turbulent Shear ◽  
Jet Flows ◽  
Duct Flow ◽  
Free Jet ◽  
Good Agreement

The boundary-layer calculation method of Bradshaw, Ferriss, and Atwell has been adapted to deal with the interaction between two shear layers with a change of sign of shear stress. Good agreement with experiments in symmetrical duct flow is found, using the same empirical input as in a boundary layer and assuming that the turbulence fields on either side of the duct can be superposed. The restriction to symmetrical flow is temporary and is a numerical rather than a physical simplification. In free jet flows, which have higher turbulence levels than ducts, small changes in empirical input are required to treat the interaction.

Management of Turbulent Shear Layers in Separated Flow

1978 ◽  
Vol 15 (7) ◽  
pp. 385-386 ◽  
Author(s):  
W.W. Willmarth ◽  
R.F. Gasparovic ◽  
J.M. Maszatics ◽  
J.L. McNaughton ◽  
D.J. Thomas
Keyword(s):  
Separated Flow ◽  
Shear Layers ◽  
Turbulent Shear

Free Turbulent Shear Layers on Plug Nozzles

1977 ◽  
Vol 99 (2) ◽  
pp. 301-308
Author(s):  
C. J. Scott ◽  
D. R. Rask
Keyword(s):  
Turbulent Mixing ◽  
Schmidt Number ◽  
Error Function ◽  
Mixing Layer ◽  
Shear Layers ◽  
Turbulent Shear ◽  
Gas Chromatograph ◽  
Plug Nozzle ◽  
Turbulent Schmidt Number ◽  
Plug Nozzles

Two-dimensional, free, turbulent mixing between a uniform stream and a cavity flow is investigated experimentally in a plug nozzle, a geometry that generates idealized mixing layer conditions. Upstream viscous layer effects are minimized through the use of a sharp-expansion plug nozzle. Experimental velocity profiles exhibit close agreement with both similarity analyses and with error function predictions. Refrigerant-12 was injected into the cavity and concentration profiles were obtained using a gas chromatograph. Spreading factors for momentum and mass were determined. Two methods are presented to determine the average turbulent Schmidt number. The relation Sct = Sc is suggested by the data for Sc < 2.0.

Pressure Drop and Heat Transfer in Turbulent Duct Flow: A Two-Parameter Variational Method

1995 ◽  
Vol 117 (2) ◽  
pp. 289-295 ◽  
Author(s):  
N. Ghariban ◽  
A. Haji-Sheikh ◽  
S. M. You
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Pressure Drop ◽  
Variational Method ◽  
Turbulent Flow ◽  
Turbulent Shear ◽  
Duct Flow ◽  
Turbulent Shear Stress ◽  
Fully Developed Turbulent Flow ◽  
Two Parameter

A two-parameter variational method is introduced to calculate pressure drop and heat transfer for turbulent flow in ducts. The variational method leads to a Galerkin-type solution for the momentum and energy equations. The method uses the Prandtl mixing length theory to describe turbulent shear stress. The Van Driest model is compared with experimental data and incorporated in the numerical calculations. The computed velocity profiles, pressure drop, and heat transfer coefficient are compared with the experimental data of various investigators for fully developed turbulent flow in parallel plate ducts and pipes. This analysis leads to development of a Green’s function useful for solving a variety of conjugate heat transfer problems.

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