Section 2.0 - Loads

ID #1122

If Ca=1.5 is used for a rectangular cluster of round lines, can that be considered a "sub-critical" coefficient, so that Ka can be equal to 1-epsilon, with the 0.6 cap, provided the lines are all in the face zone? The term “sub-critical” only applies to round objects, not square or rectangular, and Ca=1.5 does not seem to be sub-critical coefficient nor a “flat” coefficient. But the edges of the cluster are round, after all.

Transitional or supercritical flow conditions cannot be considered for any cluster, be it an equivalent round, square or rectangular, due to roughness of the cluster. It is acceptable to include Ka (including 1-epsilton, with the 0.6 cap) in the calculation of EPA of a cluster.

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Last update: 2013-08-08 14:41
Author: John Erichsen
Revision: 1.0

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