Abstract
The problems of biased velocity statistics in laser anemometry in turbulent flows, whereby the higher velocities are sampled more frequently than the lower ones, is now well accepted and understood. This paper deals with the additional and previously unquantified bias which occurs when two fluids with different particle concentrations undergo turbulent mixing. A simplified one-dimensional analysis of this effect is presented and applied to a typical turbulent mixing flow, where it is shown that large errors in turbulence intensity and moderate errors in mean velocity are possible. Methods of avoiding or minimizing these errors are discussed.
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