4HE Fluid Mechanics - October 1998
Part A - (20 X 2 = 40 marks)
Part B - (5 X 12 = 60 marks)
(b)A simple U-tube manometer is installed across an orifice meter. The manometer is filled with mercury (sp.gr = 13.6) and the liquid above the mercury is carbon tetra chloride (sp.gr = 1.6). The manometer reads 300 mm. What is the pressure difference over the manometer in Newtons per square meter? (4)
(b) Pressure drop of a homogeneous fluid in a straight smooth pipe (DP) is a function of the pipe geometry (diameter d, and length l), the physical properties of the fluid (densityr and viscosity m) as well as its velocity v.
DP = f (d, l, r, m, v)
Using dimensional analysis, find out the relationship between dimensionless groups, defining the above fluid flow process. (8)
(b) Discuss the velocity profiles for laminar and turbulent fluid flow through a pipe. What is the relationship between skin friction and wall shear in a pipe? (6)
(b) Brine is to be pumped through a 25 m of smooth copper tube having an inside diameter of 2.5 cm. Flow rate of brine is 100 litre/min. Calculate the following:
(i)Pressure drop from friction in kN/m2
(ii)Power required to overcome friction.
(b) Discuss the principle and applications of Doppler effect in flow measurement. (6)
(b) An oil of specific gravity 0.8 is flowing through a venturi meter having inlet diameter 20 cm and throat diameter 10 cm. The mercury differential manometer shows a reading of 25 cm. Calculate the discharge of oil through the horizontal venturi meter. Take Cd = 0.98 (8)
(b) Derive Carman-Kozney equation for pressure drop through a packed bed. (6)
(b) Differentiate between Loading and Flooding. How will you estimate the flooding velocity in a packed tower? (6)
(b) State the principle and applications of air lift and diaphragm pumps. (6)
(b) A centrifugal fan is used to take flue gas at rest and at a pressure of 700 mm Hg and a temperature of 90oC and discharges it at a pressure of 765 mm Hg and a velocity of 45 m/s. Calculate the power required to move 18000 m3/hr of gas. Efficiency of the fan is 65%. Molecular weight of the gas = 32. (6)
Last Modified on: 04-Feb-2022
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