CHEMENG 2G03 Study Guide - V Speeds, Reynolds Number
4 Mar 2014
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Question 1: since we know that the friction factor is dimensionless, we know that the other side of the equation must also be dimensionless. Since the only variable on the right side of the equation are. (relative roughness) and re (reynolds number), they must both be dimensionless. a) Figure : plot of log f vs. log re(range of 100000-5000000) The different relative roughness results in a different starting spots and a steeper curvature, where the lower the , the more steep the curve. Question 2: a) b) starting with the equation f = a. We then replace u and y, to get f = a u y l relating the force with density, area, speed and height. Then since t = r x f, and is uniform along the fluid, Question 3: a: when the ball is completely submerged, the forces acting on it include t(tension), fg (gravity), fw (water), fc (carbon tetrachloride) and fb (buoyancy).
