Calculating equivalent length of expansion/contraction from K value

  • Thread starter cjc0117
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If you know the resistance coefficient, K, for a sudden expansion or contraction in a pipe, how can you calculate the equivalent length, Le from the K value?

I know that for fittings, Le=KD/f, where D is the diameter and f is the Darcy friction factor. But when considering a contraction or expansion with a known K value, should you use the diameter of the larger or smaller pipe when calculating Le? And which pipe's friction factor should be used? Do you use averages, perhaps? Thanks
 

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