Response of a turbulent pipe flow to a change in roughness
Abstract
Measurements of mean longitudinal velocities, static pressure, turbulence quantities and Reynolds shear stress were made in the region between fully-developed smooth wall and rough wall flows in a circular tube. The rough tube was formed by placing rectangular cross-sectioned rings inside a smooth pipe. A phenomenological model was developed to describe the flow in the region of change. The longitudinal pressure gradient responds very rapidly (within a couple of diameters) to the new wall roughness. The effect on the mean and fluctuating velocity parameters was found to grow with the half-power of the longitudinal distance from the start of the roughened tube for the case when the initial roughness element is upstanding.
- Publication:
-
ASME Journal of Fluids Engineering
- Pub Date:
- September 1977
- Bibcode:
- 1977ATJFE..99..548S
- Keywords:
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- Flow Measurement;
- Pipe Flow;
- Reynolds Stress;
- Surface Roughness Effects;
- Turbulent Flow;
- Wall Flow;
- Circular Tubes;
- Flow Velocity;
- Perturbation Theory;
- Pressure Drop;
- Pressure Gradients;
- Static Pressure;
- Fluid Mechanics and Heat Transfer