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FluidsII_midterm2-08

# FluidsII_midterm2-08 - Midterm Exam 2 530.328 Fluid...

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Midterm Exam 2 530.328 - Fluid Mechanics II, Spring 2008 Closed Books (40%) – 20 mins Name : ................................... 1. In two-dimensional incompressible inviscid, irrotational flow (in a horizontal plane), if the streamlines are as follows: Which of the following statements is true: (a) Pressure at B is lower than at A (b) Pressure at B is equal to pressure at A (c) Pressure at B is higher than at A (d) Stagnation pressure at A is zero 2. Boundary layer separation occurs because (a) viscosity is too low to counteract the pressure force normal to the wall (b) the effect of lift forces on a streamlined body (c) high-speed fluid near a solid boundary reverses direction under the action of decreasing pressure downstream. (d) low-speed fluid near a solid boundary reverses direction under adverse pressure gradient (increasing pressure downstream). (e) Excessive hemical potential between fluid and solid boundary. 3. Consider stagnation-point flow near a solid wall, of both signs. The outer flow is irrotational, but close to the wall, there are boundary layers. In which case would you expect boundary-layer separation

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