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Rotary (Roots) Blower

  1. Nov 11, 2014 #1

    I would like to know how the RPM of a root blower will affect the CFM and pressure created by the blower. The confusion that I have is this: Generally when RPM is decreased, both the CFM and pressure decreases. But according to Bernoulli's principle, should not one decrease and the other increase?

    Pls help.
  2. jcsd
  3. Nov 11, 2014 #2


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    Science Advisor

    A Roots Blower is a positive displacement pump so CFM multiplied by Pressure will be proportional to RPM.

    What has Bernoulli's principle got to do with a positive displacement pump ?
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