Question: We can show that dimensionless drag force is a function of Reynolds number, i.e.: fraction numerator 2 F subscript D over denominator rho v squared
We can show that dimensionless drag force is a function of Reynolds number, i.e.: fraction numerator 2 F subscript D over denominator rho v squared L squared end fraction equals f open parentheses fraction numerator rho v L over denominator mu end fraction close parentheses In water tank testing ( = 1000 kg/m3, = 0.001 Pa s) of a scale model of a car (Lmodel = 0.2 m), we measure a drag force FD = 125 N at a water flow velocity = 5 m/s. What is the predicted drag force, in units of newtons (N), for the real car (Lcar = 1.5 m) in air ( = 1.3 kg/m3, = 1.8 x 10-5 Pa s) and under dynamically similar conditions
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