Measurements of velocity and concentration in a high Reynolds number turbulent boundary layer

Abstract

Measurements of velocity and concentration fluctuations for a horizontal plume released at eight different heights within a turbulent boundary layer (TBL) are discussed in this paper. Most previous studies have reported measurements for the source height limited to sz=δ ≤ 0:2 (sz is the source height and d is the boundary layer thickness). Here we examine concentration fluctuations when the plume is released in the logarithmic and outer regions of a TBL in order to understand the role of large-scale structures in the transport of scalar quantities. The wall-normal distributions of mean and variance of concentration fit well with the reflected-Gaussian model as previously reported by Fackrell..