Subject Code: 2153612
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- V (New) EXAMINATION - WINTER 2019
Subject Name: Basics of Fluid Flow
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Mention four important properties of fluid with their corresponding units. [03]
(b) What is meant by Potential flow. Specify its characteristics. [04]
(c) The dynamic viscosity of an oil used for lubrication between shaft and a sleeve is 6 poise. The shaft is of diameter 0.4m and rotates at 190 rpm. Calculate power lost in bearing for a sleeve length of 90mm. The thickness of oil film is 1.5mm. [07]
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OR
Q.2 (a) List the conditions of equilibrium of a floating body. [03]
(b) Write a short note on different pressure measurement scales [04]
(c) Find the density of a metallic body which floats at interface of mercury of specific gravity 13.6 and water such that 40% of its volume is submerged in water. [07]
OR
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Q.3 (a) The diameter of a pipe at sections 1 and 2 are 10 cm and 15 cm respectively. Find the discharge through the pipe if velocity of water flowing through pipe at section 1 is 5 m/s. Determine the velocity at section 2. [03]
(b) Explain the terms (i) Reynolds number (ii) Mass velocity (iii) Transition length [04]
(c) Differentiate Streamlines and Streamtubes. [07]
OR
Q.4 (a) Write the three representational forms of Bernoulli's equation relating to flow of fluid between two points in an incompressible fluid. [03]
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(b) How flow measurement is quantified in case of non-circular cross sections? Mention the correction factors included in Bernoulli’s equation to account for flow in practical situations. [04]
(c) At a certain section A of a pipe line carrying water the diameter is 1m, the pressure is 98.1 kN/m² and the velocity is 3 m/sec. At another section B, which is 2m higher than section A, the diameter is 0.7m and the pressure is 59.2 kN/m². What is the direction of flow? [07]
OR
Q.5 (a) What is understood by a Hydraulically smooth pipe? [03]
(b) With a neat diagram explain the working principle of rotameter. [04]
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(c) Derive Hagen Poiseuille's equation for the flow of incompressible fluid in laminar regime through a pipe [07]
OR
Q.6 (a) A pitot tube is used to measure velocity of water in a pipe. The stagnation pressure head is 6m and static pressure head is 5.5m. Calculate the velocity of flow assuming coefficient of tube as 0.98. [03]
(b) Mention the various form frictional losses for the flow of fluid through a pipe. [04]
(c) Water is flowing through a pipe of diameter 30 cm and length 60m connected to the base of a tank. The water level in tank is 5m above centerline of pipe. Considering friction factor f=0.006, Determine volumetric flow rate of water. [07]
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OR
Q.7 (a) Differentiate positive displacement and centrifugal pipes. [03]
(b) With the help of a neat diagram explain various heads in a pump. [07]
OR
Q.8 (a) What is terminal settling velocity? Mention the regime in which a particle settles under such conditions. [03]
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(b) Write a short note on flow patterns in agitated vessels. [04]
(c) Derive an expression for minimum fluidization velocity for flow of fluid through a packed bed considering pressure drop per unit length of bed. [07]
Date: 02/12/2019
Total Marks: 70
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