Biju Patnaik University of Technology 2008-4th Sem B.Tech (B Tech) , fluid flow and flow measurement. - Question Paper
BPUT(B Tech) , fourth semester fluid flow and flow measurement. Fourth Semester Examination - 2008 FLUID FLOW AND FLOW MEASUREMENT Full Marks - 70 Time : 3 Hours "
Answer Question No. 1 which is compulsory and any five from the rest.
The figures in the right-hand margin indicate marks.
1. Answer the following questions : 2 *10
(a) Define boundary layer thickness. At what condition boundary layer separation occurs.
(b) Define drag coefficient and fannings friction factor.
(c) The SI unit of dynamic viscosity is
__ Spherical shape of mercury
is due to__
(d) For 11 = 2.49 poise, specific gravity = 0.83, what is the value of kinamatic viscosity in stokes.
(e) What are the assumptions made in the derivation of Bernoullis equation ?
(f) Differentiate between Froude number and
Euler number, i '
stliridi.i (9) For turbulent flow of Newtonian fluid in a pipe, pressure drop can be calculated by
_and for laminar flow the value
of momentum correction factor (p) is
(h) Write Erguns equation. Define porosity.
(i) What is cavitation ?
(j) Define piezometric head. Pitottube is used
for measuring__
2. (a) The pressure difference AP in a pipe of
diameter D and length L due to turbulent flow depends on the velocity V, viscosity li,density p and the roughness k. Using Buckinghams n Theorem obtain an expression for AP 5
(b) A thin plate moving in still atmospheric air at a velocity of 5 m/sec. The length of the plate is 0.6 m and width is 0.5 m. Calculate the thickness of the boundary layer at the end of the plate. Density of air=1.24 kg/m1. Kinematic viscosity = 0.15 stokes. 5
(b) Differentiate between Orifice meter and Venturimeter. 5
4. (a) Define minimum fluidization velocity.
Derive the equation for minimum fluidization velocity. What are the advantages and disadvantages of fluidization? 5
(b) Define terminal velocity. Differentiate between free settling and hindered settling.
5
5. (a) A pipe of 7.5 cm i.d. is carrying water at
20 C. In this pipe a venturimeter is fitted which has a throat diameter 2 cm. If the differential mercury manometer shows a reading of 50 cm, what is the flow rate of water in the pipe ? Assuming Cd = 0.98.
5
(b) What is the maximum diameter of a spherical particle of dust of density 2.5 gm/cc which will settle in the atmosphere (air density 1.225 x 10-3 gm/cc, kinematic viscosity 0.149 cm2/sec) in good agreement with stokes law. 5
6. (a) Differentiate between fan, blower and
compressor. 5
(b) Derive shear stress distribution equation in a cylindrical tube. 5
7. (a) Carbon tetrachloride is to flow through a
smooth horizontal circulartube of i.d. 3 cm at a volumetric flow rate of 2 lit/sec at 25 C. Estimate the pressure loss per cm length of the tube density and viscosity of carbon tetrachloride are 1.54 gm/cc and
0.87 cp respectively. 5
(b) Calculate the hydraulic mean diameter of the annular space between a 40 mm and a 50 mm tube. 5
8. Write short notes of following (any two): 5x2
(a) Centrifugal pump
(b) Hydrostatic equilibrium.
(c) Heat transfer in isothermal flow
(d) Notches and Weir.
CPCH 7202 6 -C
(a) An oil of viscosity 0.1 Ns/m2 and relative
density 0.9 is flowing through a circular pipe of diameter 50 mm and length 300 m. The rate of flow of fluid through the pipe is 3.5 lit/sec. Find the pressure drop in a length of 300 m and also the shear stress at the pipe wall. 5
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