Introduction: Concept of heat transfer, Difference between the subject of "Heat Transfer"
and its parent subject "Thermodynamics", Different modes of heat transfer - conduction,
convection, radiation and Combine mode, Basic laws of conduction, convection & radiation,
Effect of temperature and pressure on thermal conductivity of solids, liquids and gases and its
measurement, Thermal diffusivity and its significance, Newtonian heating and cooling of
solids.
Conduction: Fouier's law of heat conduction, Three-dimensional general conduction
equation in rectangular, cylindrical and spherical coordinates involving internal heat
generation and unsteady state conditions. Derivation of equations for simple one dimensional
steady state heat conduction from three dimensional equations for heat conduction though
walls, cylinders and spherical shells (simple and composite), critical thickness of insulation
layers on pipes carrying hot fluids. Internal generation cases along with some practical cases
of heat conduction. Influence of variable thermal conductivity on conduction through simple
cases of walls / cylinders and spheres.
Theory of Fins: Fins, Types of Fins, Straight rod type of fins of uniform cross-section e.g.
circular, rectangular or any other cross-section. Heat dissipation from an infinitely long fin,
heat dissipation from a fin insulated at tip and loosing at tip. Optimum design of straight find
of rectangular and triangular profile cross-sections; fin effectiveness and fin efficiency for
straight rod fins of rectangular and circular cross-section.
Heat Exchanger: Function of heat Exchanger, Classification, types and applications of heat
Exchangers, elements of heat exchanger and Overall coefficient of heat transfer, Different
design criterion for heat exchangers, Log mean temperature difference for evaporator and
condenser tubes, Parallel and counter flow heat exchangers, NTU, Calculation of number and
length of tubes in a heat exchanger.
Radiation: Process of heat flow in radiation, Definition of Emissivity, Absorptivity,
reflectivity and transmissivity, Concept of black and grey bodies, Kirchoff’s law and Stefan
Boltzmann’s law.
Convection Process and Properties: Free and forced convection, laminar and turbulent
flow, Newton Rikhman Law, Nusselt Number, significance of dimensionless numbers.
Heat Transfer in IC Engines: Heat transfer and Engine energy balance, Temperature
distribution and thermal stresses in piston, cylinder linear, cylinder head, and valves