The inlet contraction and test section of a laboratory wind tunnel are shown. The air speed in the test section is \(U=50 \mathrm{~m} / \mathrm{s}\). A totalhead tube pointed upstream indicates that the stagnation pressure on the test section centerline is \(10 \mathrm{~mm}\) of water below atmospheric. The laboratory is maintained at atmospheric pressure and a temperature of \(-5^{\circ} \mathrm{C}\). Evaluate the dynamic pressure on the centerline of the wind tunnel test section. Compute the static pressure at the same point. Qualitatively compare the static pressure at the tunnel wall with that at the centerline. Explain why the two may not be identical.

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Flow U = 50 m/s -Test section Contraction P6.33