Trick your friends into building a vortex tube

Earla writes –

I made a Hilsch tube in my shop this weekend. It’s quite impressive! With just a little experimentation, at 80 PSI. the temperature is 17 Degrees on one end and about 70 degrees on the hot side. The pipes are 1/2″ PVC. The center hole where the vortex is formed is 11/32″ with a 1/4″ hole in the washer on the cold side. There are 4 equally spaced Drill #53 (.059) holes Tangent to the center hole that forms the vortex. The valve on the hot side is from a old air tool. It’s quite loud and you can hear the air “spinning up” like a turbo! It uses lots of air.

P.O.K.E.R. Night – Link.

From the pages of MAKE:

P.O.K.E.R. Night. MAKE 09 – Page 34. Subscribers–read this article now in your digital edition or get MAKE 09 (on stands now).