Physics Help Forum flow rate in a moving pipe

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Mar 18th 2016, 07:01 AM #1 Senior Member   Join Date: Jun 2014 Posts: 306 flow rate in a moving pipe for part c , why when the vane is moving , the flow rate doesn't change ? ? The flow rate is given by the formula Q=Av , where A = area , v = velocity . IMO , when the velocity of vane change , the flow rate is no longer 0.687kg/s , it should be 0.68kg/s = (10^3)(A)(24) , A= 2.83x10^-5 (m^2) , so the new Q should be pa(v-u) = (10^3)(2.83x10^-5)(24-8) = 0.453kg/s , am i right?? Attached Thumbnails

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