D 02000FT205092001 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Third Semester B.Tech Degree (S,FE) Examination December 2020 (2015 Scheme)

Course Code: FT205
Course Name: FUDAMENTALS OF HEAT AND MASS TRANSFER

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 9) Derive an expression for heat flow through Spherical system by conduction. (7)
b) Define Heat flow rate and give its unit. (3)
2 93) Derive the critical thickness of insulation for plane wall and cylinder. (7)
b) State Fourier law of heat conduction. (3)
3 9) Explain the regimes of heat transfer. (6)
b) What are the differences between drop wise and film wise condensation? (4)
4 ஐ Derive the dimensional analysis for forced convection. (6)
b) Explain about the boundary layer formation. (4)
PART B

Answer any three full questions, each carries 10 marks.
5 9) Derive the LMTD expression for counter flow heat exchanger by indicating its (6)

assumptions involved.

b) What are the basic laws of radiation? (4)

6 a) Explain the working and constructional details of double pipe heat exchanger (5)

with a neat sketch.

b) A heat exchanger has 17.5 ന area available for heat transfer. It is used for (5)
cooling oil at 200°C by water available at 20°C. The mass flow and specific
heat of oil are 1000Kg/hr and 1.9 kJ/kg K and mass flow and specific heat of
water are 3000Kg/hr and 4.187 kJ/kg K. If the overall heat transfer coefficient
is 300 W/m°K, Estimate outlet temperatures of oil and water for parallel flow

heat exchanger by NTU Method.

7 9) Discuss the mass transfer theories and how mass is transferred. (5)

b) Derive the equation for equimolar state diffusion of A in liquids. (5)

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