Wake‐Phänomene hinter festen und fluiden Partikeln

Wake phenomena behind solid and fluid particles. While detailed information is available about the nature and the phenomology of the wake, there is a distinct lack of practically useful and quantitative information about the size of the wake behind single fluid particles and in a swarm thereof. Many studies have been performed on the wake behind individual particles, yet the results are not only fragmentary, i. e. of little relevance for the operating regime of bubble columns, but also beset with surprisingly large discrepancies. These considerable differences are of a systematic nature and due partly to insufficient elimination of surfactant effects, partly to different boundary effects of the experimental equipment, and partly to differing measuring techniques. Experimental results for the wake in swarms of droplets and bubbles in the relevant operating regime are still completely lacking.