This question is about external flow A 2.2-cm outer diameter pipe is laid across

Question

This question is about external flow A 2.2-cm outer diameter pipe is laid across a 30-m wide river completely immersed in water with a velocity of 4 m/s. Determine the drag force exerted on the pipe by the river. Take the density and dynamic viscosity of water to be, 1000 kg/m^3 and 1.138 times 10^3 kg/m.s. Consider a refrigeration truck travelling at 105 km/h, the refrigerated compartment is a box 6m long by 2.7m wide and 2.4m high. Determine the drag force acting on the top and the side surfaces and the power required to overcome the drag force.

Explanation / Answer

Dear student, please pose your questions in different post so you will have more chance to get them solved.

In the meantime I solved question a).

The force acting over the pipe is F=Cd*rho*V2*A/2, where A=L*D is the proyected area normal to the flow, and Cd is a function of Re=rho*V*D/vis. Re=1000*4*2.2x10-2/1.138x10-3=77328 reading in the chart for a smooth cylinder we get Cd=1.0, so F=1.0*1000*42*(30*2.2x10-2)/2=5280 N

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