HT

HEAT TRANSFER (A60331)

UNIT-I

Introduction,

Basic Modes of heat transfer

Fundamental laws of heat transfer  

Simple General discussion about applications of heat transfer.

Conduction Heat Transfer:

Fourier Heattransfer equation

General heat conduction equation in:

• Cartesian coordinates,
• Cylindrical coordinates and
• Spherical coordinates

Simplification and forms of the field equation

Steady, unsteady and periodic heat transfer

Initial and boundary conditions.

UNIT-II

One Dimensional Steady State Conduction Heat Transfer:

Homogeneous slabs, hollow cylinders and spheres

Composite systems

Overall heat transfer coefficient

Electrical analogy

Critical radius of insulation

Variable Thermal conductivity

Systems with heat sources or Heat generation

Extended surface and fins.

One Dimensional Transient Conduction Heat Transfer:

Systems with negligible internal resistance

Chart solutions of transient conduction systems.

UNIT-Ill

Convective Heat Transfer:

Classification of systems based on causation of flow, condition of flow, configuration of flow and medium of flow  

Dimensional analysis as a tool for experimental investigation  

Buckingham TT Theorem and method

Application for developing semi - empirical non­dimensional correlation for convection heat transfer

Significance of non­dimensional numbers

Use of empirical correlation for convective heat transfer.

Forced convection:

External Flows: Flat plates and Horizontal pipes.

Free Convection:

Vertical plates and pipes

Concepts about Hydrodynamic and thermal boundary layer along a vertical plate.

UNIT- IV

Heat Transfer With Phase Change:

Boiling:  

Pool boiling

Calculations on Nucleate boiling, Critical Heat flux and Film boiling.

Condensation:

Film wise and drop wise condensation

Film Condensation on a vertical and horizontal cylinders using empirical correlations.

Radiation Heat Transfer:

Emission characteristics and laws of black-body

Radiation- Irradiation

Total and monochromatic quantities

Laws of Planck, Wien, Kirchoff, Lambert, Stefan and Boltzmann

Heat exchange between two black bodies

Concepts of shape factor  

Emissivity

Heat exchange between grey bodies

Radiation shields

Electrical analogy for radiation networks.

UNIT V

Heat Exchangers:

Classification of heat exchangers

Overall heat transfer Coefficient and fouling factor  

Concepts of LMTD and NTU methods

Problems using LMTD and NTU methods.