I have a set up that inflates a rubber jacket in order release the metallic rings from underneath it. I am currently having issues with not having enough pressure (force) at the outlet to inflate the rubber jacket. I want to reduce the size of the pipe in order to increase the velocity, will this work?

  • $\begingroup$ Reducing the diameter of the pipe will increase velocity at the outlet, that's for sure. $\endgroup$ – Gert Dec 15 '18 at 17:00
  • $\begingroup$ A diagram of the setup might help? $\endgroup$ – Chet Miller Dec 15 '18 at 17:40

Assuming somewhat approximately the gas is in-compressible, then (continuum equation):

$$v_1A_1\approx v_2A_2$$

where the $A$ are the cross-sections of the pipe.

So we can write:

$$v_2\approx\frac{A_1}{A_2} v_1$$

Using diameters $D$:

$$v_2\approx\Big(\frac{D_1}{D_2}\Big)^2 v_1$$

So fitting an adaptor with $D_2<D_1$ will increase $v_2$.


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