B.E-B.E Biotechnology 1st Sem HEAT TRANSFER(University of Pune, Pune-2013)

UNIVERSITY OF PUNE

[4363]-276

T. E. (BIOTECHNOLOGY), Examination 2013

REACTION ENGINEERING (315466)

(2008 Pattern)

[Time : 3 Hours]                                                [Max. Marks : 100]

[Total No. of Questions:12]                                                      [Total No. of Printed Pages :3]

Instructions :

(1) Answers three questions from Sections I and three questions from

Section II.

(2) Answers to the two sections should be written in separate

a n s w e r - bo o k s .

(3) Black figures to the right indicate full marks.

(4) Neat diagrams must be drawn wherever necessary.

(5) Use of scientific calculator is allowed.

(6) Assume suitable data, if necessary.

SECTION-I

b) What are the different modes of heat transfer? Explain with suitable example.

OR

Q2 a) What is the significance of dimensional analysis? Explain its role in

data reduction.

b) For convection heat transfer for flow of fluid through a tube, derive the following equation using Buckingham pi-theorem.

Nu=c (Re)m (Pr)n

Where c, m and n are constants.

Q3 a) State and explain Fourier's law of conduction.

b) What are fins? Define fin effectiveness and explain different types of fins (at least 3) with neat sketches.

c) Explain the concept of steady state and unsteady state heat transfer.

OR

1

Q4 a) Find the heat flow rate per unit length through a thick pipe of outer

diameter 4 cm and inner diameter 2 cm. (Data: Thermal conductivity of

pipe=0.58 W/m-K; Temperature of inner wall of the pipe=70°C and Temperature of outer wall of the pipe=100°C).

b) Derive the equation to find maximum temperature distribution in an

infinitely long solid cylinder of radius R in which heat is being generated at a uniform rate of 'q' units per unit volume. The heat transfer coefficient at the

surface is 'h' and the ambient temperature is '

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