Experiments were carried out in a water tunnel and a wind tunnel to measure the drag

Chapter 8, Problem 8.76

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Experiments were carried out in a water tunnel and a wind tunnel to measure the drag force on an object. The water tunnel was operated with freshwater at 20C, and the wind tunnel was operated at 20C and atmospheric pressure. Three models were used with dimensions of 5 em, 8 em, and 15 em. The drag force on each model was measured at different velocities. The following data were obtained.Data for the water tunnel Model Size, em Velocity, m/s 5 5 5 8 8 8 I J.o ---+- ! 4.0 _j_- ~0 -- ~- 1.0 1 4.o 1 8.o Data for the wind tunnel l Model Size, em Velocity, m/s 8 I 10 -- -t- 40 80 10 15 T 40 I 15 80 1.52 4.52 Force, N 0.025 0.21 0.64 0.06 --- 0.59 1.82 The drag force is a function of the density, viscosity, velocity, and model size, Po = f(p, j..l., V, D) Using dimensional analysis, express this equation using 'IT-groups and then write a computer program or use a spreadsheet to reduce the data. Plot the data using the dimensionless parameters.

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