It was found that the tabs fixed on C-D nozzles also enhanced the jet mixing distinctly, although the boundary layers of the jets from C-D nozzles were greater than that from the convergent nozzle.

At different time, particles with different sizes can hit different locations on the wall, which are mainly at the connective part of shell and nozzle and out the convergent section of nozzle.

The key feature of the experiment is to use a convergent-disvergent nozzle to maintain a high air pressure in the test chamber and at the same time t…