J. Phil Thien's Projects

This is what I meant by the funnel size and the flare. As for the opening. It makes sense to me to make the opening of the bell mouth equal distance in area to the area of the opening of the exit orifice.

from my understanding of things it would make the most sense to have the opening height be equal in volume to the hose opening attached to the bell mouth. As I also understand having the bell mouth flare bent as well as keeping the funnel at a less than 15 degree angle is important as well.

Thank you very much for your input. I am going to be building mine double high. as well I am going to be adding an inlet that is rectangular I don't have the sketch-up knowledge on how to make a top hat with a rectangular inlet I do have the art skills but not with a computer I will add a scale drawing on what my build entails in future threads.

I have been looking on this site for quite some time and have had no luck in coming up with an answer to a question.

When building a separator the inlet is set tangentially to the top hat. Does changing the inlet angle axis change the efficiency of the tophat? I know from my experience with Navy aircraft that pre-swirling the air aids in performance of the engine. So I was thinking that angling the inlet to follow the angle at which the dust rotates will increase the overall collection efficiency. What do you all think?