Simulation of convection currents set up by jets and plumes in fluids of varying stratification

Abstract

 Tollmien's analysis for velocity and cone angle of jets bas been briefly examined. The jet dispersion was observed in a glass tank filled with water and/or brine. The angle of the cone of dispersion was observed to be the same what ever was the variation in stratification and density.

For observation of plumes, experiments were also carried out in the extended glass tank filled first with water and then with salt solution stratified in density layers. Isolated volumes of concentrated salt solution, suitably coloured with dye, were released from rest from above, and the dispersion was observed and photographically recorded.

The main discovery concerning u stratified fluid was that the cone of the plume (before it dispersed horizontally) tended to make a narrower 'neck', as in contrast with plume dispersion in an unstratified fluid.

As in the case of an unstratified fluid, the dimensional analysis equations (Bee Scorer, Richalds, etc) were approximately obeyed initially, except that the values of the constant parameters {e.g., n, C, etc.) were found to be different. A short note is included in this paper on bubble dynamics as was studied originally by Taylor.