Question

You are an underwater swimming robot that will propel itself through water at a speed of 2 m/s. You'd like to estimate both the drag and the rate of heat loss due to convection on the robot at that swimming speed; unfortunately, the largest test facility you have access to is a water tunnel that can only fit a scale model of the robot with a length 1/5 of the full size. designing a) At what swimming speed should you run your experiment to get results that you can apply to the full-scale robot? b) Running at that appropriate speed, you measure a drag force of 2 kN on your scaled- down robot. What drag force do you expect on your full-scale robot? (Assume that the projected frontal area of the robot scales with the length squared: Af = cL, where c is a constant.) c) Running at the appropriate speed, you measure a convection coefficient of h 5000 W/m2 -K. What convection coefficient do you expect on the full-scale robot?

Answer 1

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