The Wide World of Fluids article titled "Curtain of Air,". The fan shown in Fig. P5.120 produces an air curtain to separate a loading dock from a cold storage room. The air curtain is a jet of air \(10 \mathrm{ft}\) wide, \(0.5 \mathrm{ft}\) thick moving with speed \(V=30 \mathrm{ft} / \mathrm{s}\). The loss associated with this flow is loss \(=K_{L} V^{2} / 2\), where \(K_{L}=5\). How much power must the fan supply to the air to produce this flow?

Figure P5.120

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+ f Fan V = 30 ft/s 10 ft- Air curtain (0.5-ft thickness) -Open door