A 1:10 scale model of an attack submarine is being tested
in a water tunnel. The drag force ratio the submarine in the deep sea and the submarine model in the
tunnel need to be estimated. The submarine cruises at 4 m/s
in seawater (viscosity, μ = 1.2×10-3 N-s/m2
and density, ρ = 1,030 kg/m3).
The fresh water in the tunnel is maintained at a temperature of 40 oC.
What should the velocity of the model be in the tunnel? Determine the drag force ratio of the submarine prototype and model.
Assume the submarine is far from the water surface.
Assume the compressibility of water is negligible.
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