GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2153507 Date: 20/06/2019Subject Name: Elements of Fluid Flow
Time: 02:30 PM TO 05:00 PM Total Marks: 70
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 Froude number and explain different flows based on this number. 03
(b) Derive an expression for pressure-density-height relationship. 04
(c) Explain in detail the nature of turbulence. 07
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Q.2 (a) Write the range of Reynolds number for laminar, transition and turbulent flow. 03
(b) Write a note on boundary layer. 04
(c) Explain Rayleigh method with an example for dimensional analysis. 07
OR
(c) Explain Buckingham Pi theorem with an example for dimensional analysis. 07
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Q.3 (a) What is dimensional analysis? 03
(b) Determine Reynolds number and type of flow for polymer melt with a density of 900 kg/m’ and viscosity of 1Pa-s flowing at 0.2 m/s in a 20 mm tube 04
(c) Derive Reynold’s Analogy. 07
OR
Q.3 (a) What are weirs? State the different types of weirs. 03
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(b) What are sonic, subsonic and supersonic flows? At which dimensionless number they are dependent explain in detail. 04(c) Explain Newtonian and Non-Newtonian fluids with their corresponding stress strain curves and examples. 07
Q.4 (a) Find the kinematic viscosity of an oil having density 981 kg/m3. The shear stress at a point in oil is 0.2452 N/m? and velocity gradient at that point is 0.2 per second. 03
(b) What are pressure transducers? 04
(c) Explain at least five different types of flows. 07
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ORQ.4 (a) What is Newton’s law of viscosity? 03
(b) Explain similarity laws in brief. 04
(c) Derive equation of motion. 07
Q.5 (a) Classify various flow meters. 03
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(b) Write difference between venturi meter and orifice meter. 04(c) A “U”-tube manometer containing mercury of density 13600 kg/m® is used to measure the pressure drop along a horizontal pipe. If the fluid in the pipe has a specific gravity of 0.8 and the manometer reading is 0.6m, what is the pressure difference measured by the manometer? 07
OR
Q.5 (a) What is Rheology? 03
(b) Explain in detail about Magnus effect 04
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(c) Explain principle and working of Rotameter with diagram. 07--- Content provided by FirstRanker.com ---
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