As it is known if pressure drop between inlet and outlet of a geometry is known friction factor can be calculated from equation below;
Dp = f (L\D) (ro U2\2)
But use of this equation is only possible for fully developed flow. There are some other correlations to for pipes and square ducts but I need friction factor for wavy channel. Is it impossible to find it by measuring only two pressure value?
It is possible with the two pressure values. All losses are included if the waviness of the channel is symmetric , i.e. if there is no resulting force in channel-normal direction.
Perhaps the channel with wavy walls could be treated roughly (first approximation), as a sequence of alternating sudden enlargements and contractions. For these, there are well established formulas to predict the resistance coefficient (K) and consequently the associated friction pressure drop or head loss.
I am sorry I forgot to emphasis I need to calculate it for developing flow. Therefore I am suspicious about use of formula given in my previous post.
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