It is with profound sadness that we report the death of a much loved and greatly respected colleague and friend—Professor David E. Stock, Washington State University.

In a career spanning nearly 40 years “Dave” performed seminal analytical and experimental work on turbulent gas-particle flows. He is much remembered for his classic wind tunnel experiments in the 1980s on the dispersion of small particles in grid-generated turbulence. These were carried out in the presence of an electric field that controlled the drift velocity of the particles and allowed the influence of the particles’ crossing trajectories to be varied without changing the influence of the inertia. This meant that the two effects could be studied independently of one another. The experimental results for the dispersion and the particle rms velocity were in perfect agreement with theoretical predictions, and the method has been extensively used by others to calibrate and validate the numerical...

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