| Lectures/tutorials: 4+1 Periods/Week | Sessional Marks: 30 |
| University Exam: 3 Hours | University Examination Marks: 70 |
UNIT-I
Introduction:
Modes of heat transfer, basic laws of heat transfer, Analogy between heat flow and electric flow.
Conduction:
The Fourier heat conduction equation, steady state one dimensional heat conduction through plane wall, cylindrical wall, spherical wall and
composite structures. Critical insulation thickness. Unsteady state heat conduction through a semi infinite solid, infinite slab, cylinder and
sphere.
UNIT-II
Convection:
The convective heat transfer coefficient, introduction to thermal boundary layer, Dimensionless numbers in heat transfer and their significance.
Dimensional analysis.
Forced Convection:
Heat transfer by forced convection, inside tubes and ducts in laminar, transition and turbulent flow. Analogy between heat and momentum transfer,
Reynold's, Prandtl and Colburn analogies.
Natural convection:
Grashoff number, natural convection from vertical and horizontal surfaces.
Heat transfer to liquid metals:
Forced convection over exterior surfaces. Heat transfer for tubes in cross flow.
UNIT-III
Heat transfer to fluids with phase change:
Heat transfer from condensing vapours, film wise and drop wise condensation. Derivation and practical use of Nusselt equation. Condensation of
super heated vapours. Effect of non-condensable gases on rate of condensation. Heat transfer to boiling liquids. Boiling of saturated liquid.
Maximum heat flux and critical temperature drop-minimum flux and film boiling. Sub-cooled boiling.
Heat transfer by Radiation:
Thermal radiation, Black body radiation, Kirchhoff's law, emissivity, Grey body and laws of black body radiation. Geometric factor, Radiation in
enclosures with concentric cylinders and spheres. Combined heat transfer by conduction, convection and radiation.
UNIT-IV
Heat Exchange equipment:
Types of heat exchangers, log-mean temperature difference (LMTD) Correction factor. Energy balances, overall heat transfer coefficients. Heat
exchanger effectiveness. Fouling factors, Design and description of heat transfer equipment, Heat exchangers, condensers, boilers and kettles.
Extended surface equipment, Empirical relations in agitated vessels, packed beds.
Evaporation:
Types of evaporators. Capacity and economy of evaporators, boiling point elevation and Duhring's rule. Material and energy balances in single effect
evaporator. Multi effect evaporators, methods of feeding, capacity and economy of multiple effect evaporators.
Text Books