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Unformatted text preview: 22.381 Undergraduate Mechanical Engineering – Fluid Mechanics Test 2 :Chapter 3 and 4 Instructor : Prof. D. Willis Name and UMS ID: Please attempt all questions. GOOD LUCK! 1. (30pts) Answer the following short answer questions in the space provided. (a) (4 pts) What is the difference between the Lagrangian Method and the Eulerian Method ? Which is used most commonly in fluids? (b) (2 pts) Which part of the Bernoulli Equation corresponds to the dynamic pressure ? (c) (6 pts) In the two diagrams below, draw and shade the approximate level of mercury in the manometers: Figure 1: (Left) A fan downstream of the measurement section (Right) a fan upstream of the measurement section (d) True or False (Circle your answer, and use space below to write an explaination if you wish to): i. (3 pts) T / F : The total pressure is, by definition the largest pressure value along a given streamline in a valid Bernoulli analysis. ii. (3 pts) T / F : If the local derivative of x-velocity is positive, a particle passing that location in space can only be accelerating in the x-direction? 1 iii. (3 pts) T / F : If the material or total derivative of x-velocity is positive, a particle passing that location in space can only be accelerating in the x-direction? iv. (3 pts) T / F : The total pressure is always equal to or greater than the stagnation pressure?...
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- Spring '12
- Mechanical Engineering