The spanwise nonuniformity of nominally twodimensional turbulent boundary layer. I  Characteristics of spanwise velocity distribution
Abstract
In order to investigate the factors which affect the spanwise nonuniformity of the boundary layer and its properties, measurements were carried out on the mean velocity, the turbulence intensity, and wall shear stress in the transverse direction in the turbulent boundary layers which developed on two types of smooth flat plates with different shapes of leading edge. The tunnel used had a moderately low turbulence. Various measurements were carried out in the transverse direction at very small intervals. It was found that a steady spatial quasiperiodic variation increased slightly and its pattern remained fixed toward the downstream end. An appreciable negative correlation was calculated between the mean transversevelocity distribution and the turbulenceintensity distribution in the same cross section. With regard to the openarea ratio of a screen which may affect the spanwise variations, flow patterns through a screen with openarea ratios 0.41, 0.52, 0.57 and 0.68 were observed by flow visualization using the hydrogenbubble method. From these experimental results, an appropriate value was obtained for the openarea ratio of the screen used in the wind tunnel.
 Publication:

JSME International Journal Series B
 Pub Date:
 July 1975
 Bibcode:
 1975JSMEB..18..664F
 Keywords:

 Flat Plates;
 Flow Velocity;
 Turbulent Boundary Layer;
 Two Dimensional Boundary Layer;
 Velocity Distribution;
 Boundary Layer Flow;
 Circular Cylinders;
 Flow Distribution;
 Flow Visualization;
 Shear Stress;
 Wind Tunnel Tests;
 Fluid Mechanics and Heat Transfer