MODEL AND PROCEDURE FOR THE INDIRECT DETERMINATION OF THE WALL SHEAR STRESS VECTOR IN PRESSURE DRIVEN THREE-DIMENSIONAL TURBULENT BOUNDARY LAYERS

1988 ◽  
pp. 79-83
Author(s):  
M. Hoffmeister
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Boundary Layers ◽  
Three Dimensional ◽  
Turbulent Boundary Layers ◽  
Stress Vector ◽  
Indirect Determination ◽  
Wall Shear ◽  
Pressure Driven

Direct Force Wall Shear Measurements in Pressure-Driven Three-Dimensional Turbulent Boundary Layers

1982 ◽  
Vol 104 (2) ◽  
pp. 150-155 ◽  
Author(s):  
J. E. McAllister ◽  
F. J. Pierce ◽  
M. H. Tennant
Keyword(s):  
Boundary Layer ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Three Dimensional ◽  
Turbulent Boundary Layers ◽  
Direct Measurements ◽  
Stress Directions ◽  
Wall Flow ◽  
Wall Shear ◽  
Pressure Driven

Unique, simultaneous direct measurements of the magnitude and direction of the local wall shear stress in a pressure-driven three-dimensional turbulent boundary layer are presented. The flow is also described with an oil streak wall flow pattern, a map of the wall shear stress-wall pressure gradient orientations, a comparison of the wall shear stress directions relative to the directions of the nearest wall velocity as measured with a typical, small boundary layer directionally sensitive claw probe, as well as limiting wall streamline directions from the oil streak patterns, and a comparison of the freestream streamlines and the wall flow streamlines. A review of corrections for direct force sensing shear meters for two-dimensional flows is presented with a brief discussion of their applicability to three-dimensional devices.

A Review of Near-Wall Similarity Models in Three-Dimensional Turbulent Boundary Layers

1983 ◽  
Vol 105 (3) ◽  
pp. 251-256 ◽  
Author(s):  
F. J. Pierce ◽  
J. E. McAllister ◽  
M. H. Tennant
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Boundary Layers ◽  
Force Measurement ◽  
Three Dimensional ◽  
Shear Velocity ◽  
Turbulent Boundary Layers ◽  
Velocity Relationship ◽  
Wall Shear ◽  
Near Wall

Eleven near-wall similarity models for three-dimensional turbulent boundary layers which have been identified in the literature are reviewed. Each model summary includes a brief review of its derivation, discusses limitations in the derivation, estimates the applicable y+ range, and compares differences among the models. This review of three-dimensional similarity models was developed as part of a larger study which tests the validity of ten of these different models by comparison with experimental data which includes the direct and simultaneous measurement of the local wall shear stress direction and magnitude in a three-dimensional turbulent flow. A direct force measurement of local wall shear stress is necessary to test the local wall shear-shear velocity relationship, τ0 = ρq*2, generally assumed in three-dimensional flows. This review is necessary to acquaint the reader with the similarities and differences among the models tested in companion papers since differences among some of the models are significant, particularly in the coordinate systems of the vector models.

Use of Surface Fences to Measure Wall Shear Stress in Three-dimensional Boundary Layers

1973 ◽  
Vol 24 (2) ◽  
pp. 87-91 ◽  
Author(s):  
J D Vagt ◽  
H Fernholz
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Skin Friction ◽  
Boundary Layers ◽  
Manufacturing Process ◽  
Three Dimensional ◽  
Calibration Curves ◽  
Dimensional Boundary ◽  
Wall Shear

SummaryIf surface fences are to be applied for measuring skin friction in three-dimensional boundary layers they must be calibrated for both magnitude and direction of the shear stress. Results of the calibration for fences of different height are given. Furthermore, a manufacturing process and a mounting procedure are described to obtain surface fences with identical calibration curves.

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