ONUS QUESTIONS 1) The velocity boundary layer is manifested by ashstress that pr

Question

ONUS QUESTIONS 1) The velocity boundary layer is manifested by ashstress that provides a 2) The viscosity of liquidswith increasing temperature and the viscosity of gases dese with increasing temperature. (2 pts) 3) True or False? (1 pt) Convection is dependent on the geometry and roughness of a solid surface 4) What happens at the stagnation point? Be sure to discuss velocity, pressure &streamlines; in your answer. (3 pts) 5) For laminar flow of air over a flat plate, if the Reynolds number is doubled, the Nusselt number wil? (p a. Double b. Stay the same c. Decrease d, Increase, but less than double e. Increase by four times 6) The Nusselt number relation for laminar flow over a flat plate is: This means that for air flow with the same air and plate temperatures and free stream velocity, the heat transfer rate for a long plate is: (1 pt) a. Smaller than the heat transfer for a short plate b. The same as the heat transfer for a short plate Larger than the heat transfer for a short plate 7) Why do we use the log-mean temperature for a tube bank correlation (2 pts) 8) At what row is the heat transfer coefficient considered to be constant in a tube bank? (1 pt) 9) What dimensionless number is a ratio of the energy transferred by convection to that by conduction? (2 pts)

Explanation / Answer

1. Drag force

2. Increase and Decrease

3. True

4. Stagnation is the point where the local velocity of the fluid is zero.

5. (d) It will increase and depends on correlation used.

Please post the other questions seperately.

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