Does a hole work better for creating a toroidal vortex, where the fluid starts to turn as it exits, than a pipe, where the flow inside is more laminar. Some high power vortex guns have a cone shaped barrel. So, is a cone better?
Hope this image help you!!!
The thing here assume the pipe only one side, gas is moving similar to given image. If it is a cone then you can see that almost all the gas entering leaves out. Hence the power is also increased.