The multi-free gas jets downstream the nozzle can coalesce or not would depend on inclination angle and number of nozzles for a given upstream pressure and flow rate of gas. A coalescing jet is similar to that of a single jet.

When angle of inclination is  for a three hole lance, the multi-jets do not coalesce upto certain distance downstream the nozzle. A non-coalescing jet, when impinged on the liquid will produce penetration equal to number of jets.

The axial velocity decay and radial spreading depend on the ratio

(4)

If  i.e.  jet is denser than the surrounding. Such a jet will spread slowly in the surrounding; how slow would depend on the value of  . Accordingly jet velocity will decay slower at any distance downstream the surrounding. This situation could be, for example a cold jet is discharged in the hot surrounding. Length of the potential core,  and length of the supersonic core   will be longer than at .

If  jet is lighter than surrounding; jet spreads faster which results in lower  and  than , for example cold jet is discharged into slag.