This is a re-post of a "Tech Talk" Article originally posted by Garrett Hanrahan of ANCORP.
What advantage does a conical reducer offer
compared to a similarly flanged straight reducer? The answer is simple:
Conductance!
Over the same length, a conical reducer has a larger mean diameter than a straight reducer with the same flange terminations. As illustrated by the equation for conductance (C) below, diameter (D) has a third-order effect on conductance. So, if you want to increase conductance, increasing diameter is the best place to start. Reducing length (L) helps as well, but length only has a first-order effect on conductance.
Eliminating bends in a system is another way
to optimize conductance. When it comes to designing a system for optimal
conductance, it helps to remember these three characteristics: Fat, Short, and
Straight!
References: https://www.duniway.com/images/_pg/conductance-of-tube.pdf
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