GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V (New) EXAMINATION - WINTER 2019
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Subject Code: 2153507
Subject Name: Elements of Fluid Flow
Time: 10:30 AM TO 01:00 PM
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define Buckingham’s pi theorem? [03]
(b) What is the relationship between absolute, atmospheric and gauge pressure? [04]
(c) Mention the physical significance of Reynolds number. Calculate the Reynolds number for flow for water flowing at 20°C in a pipe of 40 mm ID at the rate of 500 kg/min [07]
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Q.2 (a) What is Newton’s law of Viscosity? [03]
(b) Explain Hydrodynamic Boundary layer. [04]
(c) Differentiate laminar and turbulent flow [07]
OR
(c) Discuss friction loss from sudden expansion and sudden expansion of cross section of pipe through which incompressible fluid is flowing. [07]
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Q.3 (a) Mention the different types of notches with the specific applications where they are utilized. [03]
(b) What is drag? Mention the case of drag on a flat plate when it is aligned parallel to the direction of flow of fluid. [04]
(c) Write the various representational forms of Bernoulli's equation with corresponding statements and units [07]
OR
(a) What is meant by sub sonic and supersonic flow? [03]
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(b) How U tube manometer is used to measure pressure difference across a pipe? [04]
(c) Explain Buckingham Pi theorem with an example for dimensional analysis [07]
Q.4 (a) What is meant by streamlines? How it is different from streamtubes? [03]
(b) Discuss the different states of equilibrium regarding the stability of floating bodies [04]
(c) Derive the equation of discharge for Venturimeter. [07]
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OR
(a) What is static head, dynamic head & total head? [03]
(b) Describe different hydraulic coefficients of Orifice. Develop a relationship between them. [04]
(c) Water is flowing through a pipe of 80mm diameter under a gauge pressure of 60 kPa with a mean velocity of 2m/s. Neglecting friction find the total head if the pipe is 7m above datum line. [07]
Q.5 (a) Describe any three properties of fluids with their respective units. [03]
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(b) Write about (i) Steady flow (ii) Unsteady flow (iii) Compressible flow (iv) Potential flow [04]
(c) Water is flowing through a pipe of 300mm in diameter branches into two pipes of 200 mm and 100 mm respectively. If the average velocities in 300mm and 200 mm diameter pipe is 2.5m/s and 1.6 m/s, determine the velocity in 100 mm diameter pipe. [07]
OR
(a) Describe principle, construction and working of rotameter. [03]
(¢) With a neat diagram explain the working principle of Rotameter [04]
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Date: 02/12/2019
Total Marks: 70
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