Theory questions in all the 5 units

1. HEAT AND MASS
TRANSFER
Theory questions in all the units.
A. Sankara Narayana Murthy
AP/ /Mech
Kamaraj College of Engineering and Technology
Virudhunagar

2. Unit –I
1. Derive General Heat Conduction equation in cartesian co
ordinates
2. With a neat sketch, explain different types of fin profile.
3. Explain the heat transfer through composite plane
cylinders with inside and outside convection.
4. Conduction of heat through hollow cylinder.
5. Derive the general 3 dimensional heat conduction
equation in cylindrical co ordinates. Assume the material
as homogeneous isotropic.

3. Unit II
1. Explain about velocity boundary layer on a flat plate
2. Explain the velocity boundary layer profile on a flat plate and
mention its significance.
3. Obtain an expression for the temperature profile of an infinitely
long fin of uniform cross section from basic principle and
calculate the heat transfer by fin.
4. Explain thermal and velocity boundary layer for over a horizontal
flat plate
5. Define bulk temperature and thermal entry length for tube
flows.
6. Discuss briefly the development of velocity boundary for flow
through a pipe.

4. UNIT III
1. Explain about fouling factors
2. With a neat sketch explain various regimes of boiling
3. What are the different types of fouling in heat exchangers
4. Derive the LMTD for a parallel flow heat exchanger
stating the assumptions
5. Explain briefly the various regions of pool boiling of water
of atmospheric pressure
6. Discuss critical heat flux and Leindenfrost point

5. UNIT IV
1. Derive the radiation exchange between two black surface
separated by a anon absorbing medium.
2. Considering radiation in gases, derive the exponential decay
formula.
3. Assumptions made in the analysis of heat exchangers
4. Derive wien’s displacement law of radiation from planck’s
law.
5. State and prove kischoff’s law of thermal radiation.

6. UNIT V
1. Discuss about steady state equimolar counter diffusion
2. What are the assumptions made in the ID transient diffusion
problems.
3. Explain briefly the similarities between heat and mass transfer
4. Write short notes on analogy between heat and mass transfer,
equation of process in the atmosphere, mass convection.
5. Explain equimolar counter diffusion in gases.