ME 354

HEAT TRANSFER

Note:  During examination necessary charts and tables will be supplied.

UNIT-I

Modes of heat transfer, Laws of heat transfer -   Fourier, Newton, Stefan-Boltzmann General conduction equation in Cartesian, cylindrical and spherical coordinates, one dimensional steady state conduction through slabs, hollow cylinders and spheres with and without heat generation, Effects of variable thermal conductivity in heat transfer of one dimensional steady state conduction of plates, cylinders and spheres, steady state heat transfer through composite slabs, cylinders and spheres, critical radius of insulation, two dimensional analysis of steady state heat transfer in a plate with prescribed temperature on one boundary, application of finite difference technique to two dimensional steady state conduction of a plate.

UNIT-II

Fins:  Heat transfer analysis of tips with heat dissipation environment – rectangular straight and pin fins, application of fin to temperature measurement, unsteady state conduction, lumped parameter, analysis of a body with negligible internal temperature gradients, transient heat transfer analysis of finite slab with specified temperature and convective boundary conditions, use of Grober and Heisler charts for solving problems of infinite slabs, cylinders and spheres.

UNIT-III

Convection:  Dimensional analysis and its use in free and forced convection, Buckingham theorem, Physical significance of different dimensionless numbers, application of Von-Karman integral equation for the analysis of thermal boundary layer in forced convection of flat plate, Reynold’s analogy for flow over place surfaces, calculation of heat transfer for flow over plates, cylinders and for flow through tubes in free and forced convection using empirical formulae.

UNIT-IV

Radiation:  Definition of absorptivity, reflexivity and transmissivity, concept of black-body and emissivity.  Kirchoffs law, Plank’s black body spectral distribution, Wien’s and Steffan Boltzmann law, Monochromatic and total emissive power, radiant heat exchange between two gray surfaces, shape factor, thermal circuit for radiant heat exchange between infinite parallel plates and between concentric, cylinders, Enclosures with black and gray surface, Radiation shields and reradiation surfaces. 

UNIT-V

Heat Exchangers:  Classification and applications of heat exchangers in industry, analysis and design of counter flow and parallel flow heat exchanger, Fouling factors, solving problems for multi pass heat exchanger using non dimensional parameter plots.

Change of Phase:  Boiling: pool boiling regimes, nucleate pool boiling, effect of surface wettability on bubble contact angle, critical heat flux, boiling in forced convection, Condensation: Film condensation, drop wise condensation, condensation film thickness, heat transfer coefficient in film condensation.

Suggested Reading:

1. 1.Holman, J.P., “Heat Transfer”, McGraw Hill Publication, New Delhi, 2004.
2. 2.Rajput, R.K., “Heat and Mass Transfer", S. Chand & Company Ltd., New Delhi, 2004.
3. 3.Yadav, R. Sanjay and Rajay., “Heat and Mass Transfer”, Central Publishing House, Allahabad, 2004.
4. 4.Sachdeva, R.C,”Fundamentals of Engineering Heat and Mass Transfer”, New Age International (P) Ltd Publishers, New Delhi, 2004.
5. 5.Arora, S.C and Domkandwar., “A course in Heat and Mass Transfer”, Dhanpat Rai & Sons, New Delhi, 2004.