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Max. Marks:100

(10 Marks)

(06 Marks)(06 Marks)

an oil of specific gravity 0.9

(08 Marks)

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Third Semester B.E. Degree Examinationo June/July 2014Fluid Mechanics

Note: Answer any FIVEfull questions, selectingatleast TWO questions from each part.

PART _ Aa. Defini'ihA.following fluid properties with units:

i) MbSi.density.ii) SpecifiCgravity.iii) Dynamicviscosity.iv) Vapour pressure.v) Capillarity.

b. A 150mm diameter Vefiical cylinder rotates conCentrically inside another cylinder ofdiameter 151.0mm. Both cylinders are 250mm high. The space between the cylinders isfilled with a liquid whose viscosity is unknown. If a torque of 12 N-m is required to rotatethe inner cylinder at 100rpm. Detbrmine the viscosity of the fluid. (10 Marks)

a.

b.

c.

!

State and prove Pascal's law. ,.. i.tt

With neat sketch, explain Bourdon's piessgre gauge.An open tank contains water upto a depth of lm and above itfor a depth of 1m. Find the preisure intensiryi) At the interface of the lwo liquids andii) At the bottom of tfu"tank.

a. Define: i) Total ptqSpui.; ii) Centre of pressure (04 Marks)b pbtain an expression for total pressure and centers of pressure for inclined surface

submerged in,liquid (08 Marks)c. A trapezoidai'channel 2m wide at the bottom and 1m deep has side ilopes 1 :1. Determine:

i)rotat.pre'sSure;ii)Centreofpressure,whenitisfullofwater.

arE

:=I H ,..,,*,"' ,, (04 Marks)A F . 6',,. Obtain an expression for continuity equation for tluee dimensional flows. (08 Marks)>,=ry$ ,*... Ifforatwodimensional potential flow,thevelocitypotential isgivenbV0:x(2y-1).e; ;) Determine the velocity at the point P(4. 5). Determine also the value of stream lunction rq at

5 i ; the point P. (08 Ntart<s)

. PART _BDerive Bernoulli's equation from Euler's equation with assurnptions made. (0s Marks)Derive the equation for the discharge through venturimeter. (06 Marks)Water is flowing through a pipe having diameter 300mm and 200mm at the bottom andupper end respectively. The intensity o^f pressure at the bottom end is 24.52 N/cm2 and thepressure at the upper end is 9.81 N/cm2. Determine the difference in datum head if the flow

a->r\J<* c.]

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through pipe is 40/ps.I of2

(06 Marks)

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