Cleaning by impinging liquid jets : scabs and blisters
The use of cylindrical liquid jets to clean layers of soil or residual material from walls and other surfaces is widespread in industry and other sectors. This represents a complex coupled flow problem, involving the free surface flow of a Newtonian liquid (usually water) and the deformation of a soft solid layer, often with poorly defined rheology. We have developed simple models to quantify the observed rate of removal and predict the performance of tank cleaning devices. Two applications are presented. In the first I will describe how the models can explain the observations of Kaye et al. (1995), which may be one of the rare occasions when a chemical engineer explains physicists’ data. In the second, more open-ended case for discussion, I will present recent results on what happens when a jet impinges on a thick layer of a soft-solid.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..