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it is impossible to calculate the dia without velocity. But for the details you have given we can apply the haigen poisuells law p1-p2=32Mul/d^2 where p1-p2=pressure drop M=viscosity l=length d=dia u=avg velocity umax/2=uavg

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Q: Fluid mechanics how 2calculate the non circ.duct diameterdoes not have the value of velocity.Flow rate 3msDensity 1.2kgm3 viscosity 1.7x10-5Nsm2pressure drop5KNm2Fric length 120m.frictionFact0.007?
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