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calculation of air flow conductance

calculation of air flow conductance

calculation of air flow conductance

(OP)
Hi,

I have a question concerning air flow conductance in pipe elbows. In a vacuum course I recently followed we learned that the air flow conductance in cylindrical pipes can be calculated with following formula (for laminar flows and only for air)
   c = (135 * D^4 * p)/L with D inner diameter of pipe, p pressure and L the length of the pipe. However this is only correct for straight pipes. Does anybody know how to calculate the conductance in an elbow. I heard that it was the same calculation but with a factor added to it but I don't know which factor or where to add in the formula.

Can anybody help me?

Ps: I hope my english is correct smile

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