Abstract
Wall roughness is prevalent in most of the industrial and environmental flows. It is recognized to have a significant influence on the transport properties of boundary layers and has therefore been the subject of extensive experimental study. This chapter explores the effects of surface roughness on the structure of turbulent boundary layers in open channels. The measurements are obtained on a smooth and two different types of surface roughness using a laser Doppler anemometer (LDA). The Reynolds number based on momentum thickness varies from Reθ = 1900 to 2600. The recent boundary layer theory as proposed by George and Castillo, and classical scaling laws are used to analyze the data. The results thus obtained indicate that at low-Reynolds numbers the power law proposed by George and Castillo can model a wider extent of the flow than the classical logarithmic profile, irrespective of the surface condition. The results also provide unambiguous evidence that surface roughness which increases the wake parameter and significantly enhances the level of turbulence quantities over a significant part of the boundary layer.
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