Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Chemical Engineering FLUID FLOW - Question Paper

Model Question Paper

BTCH2 FLUID FLOW

Time : 3 hrs Maximum marks : 75

 

Instruction:

1. Question paper is divided into Group A, Group B and Group C

2. Each Group is 25 Marks

3. Figure to the right in bracket indicates marks.

4. Good Handwriting is expected

5. Assume suitable data if necessary.

 

Group A (25 Marks)

 

Answer any three questions (Question 1 is compulsory)

	(5)

 

Q.1 Explain about conditions for fluidization?

(10)

Q.2 Write about Boundary layer?

(10)

Q.3 Derive Navier-stokes equation?

Q.4 With neat sketch, explain about Decanter?

(10)

Q.5 Derive Burke Plummer equation for flow through packed bed?

	(10)

 

Group B (25 Marks)

 

Answer any three questions (Questions 6 is compulsory)

	(5)

 

Q.6 A horizontal cylindrical continuous decanter is to separate 1500 bbl/day

(0.993m³/h) of a liquid petroleum fraction from an equal volume of wash acid.

The oil is the continuous phase and at the operating temp has a viscosity of 1.1Cp

and a density of 54 lb/ft³ (1153 kg/m³). Compute a) size of the vessel b) height

of acid over flow above the vessel floor.

 

Q.7. Air at 20^oC at 2-atm absolute pressure enters a finned tube steam heater through

a 50mm tube at an average velocity of 15m/s. It leaves the heater through a

65-mm tube at 90^oC and 1.6atm absolute. What is the average air velocity at

the outlet?

 

(10)

Q.8 Water is flowing at 50 ^o F through a long horizontal plastic pipe 3in in inside

diameter, at a velocity of 8 ft/s. a) Calculate the pressure drop in lb_f/in ² per

100ft of pipe. b) If the pressure drop must be limited to 2lb_f/in² per 100ft of

pipe, what is the maximum allowable velocity of the water?

 

(10)

Q.9 Explain about friction loss from sudden expansion of pipe?

Q.10. Derive the hydrostatic equilibrium equation and barometric equation?

 

 

(10)

 

Group C (25 Marks)

 

All Questions are Compulsory.

 

Q.11 Fill in the blanks ( each question carry 2 marks)

 

i)                    Fluid is a substance that does not ________resist distortion.

ii)                  Study of fluid in motion is called___________.

iii)                ______ is an important device for measuring pressure difference.

iv)                The condition where u=a &Ma=1 is called_________.

v)                  Stokes law, F_D=_____________.

 

Q.11 Multiple choice question. (Each question carry 2 marks)

 

i)                    Drag coefficient C_D is____________

a)      2F_D/A_pv_o² b) F_D/2A_pv_o² c) A_pv_o² /F_D

 

ii)                  If Mach number ma<1, then the fluid is called ___________.

a) sonic b) subsonic c) supersonic

 

iii)                Rubber latex is an example of_____________

a) Bingham fluid b) Dilatent heat c) pseudoplastic fluid

 

iv)                For constant density and zero viscosity, as in potential flow, the equation of motion known as___________

a) Navier stokes equation b) Ergun equation c)Euler equation

 

v)                  The cross-section of minimum area at which the jet changes from a contraction to an expansion is called ______________.

a) contraction loss coefficient b) vena contract a c) Expansion loss coefficient

 

Q.11 True or false (each question carry 1 marks).

 

i)                    A steady flow through straight pipe is an example of one dimensional flow.

ii)                  Gases are generally considered to be incompressible.

iii)                Gauge pressure is pressure measured above the prevailing atmospheric pressure.

iv)                Old, foul and corroded pipe can be very smooth.

v)                  Dilatent fluids are said to be shear rate thickening.

 

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