Heat Transfer Notes JNTU – HT Notes JNTU of Total Complete Notes
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UNIT – I
Introduction : Modes and mechanisms of heat transfer – Basic laws of heat transfer –General discussion about applications of heat transfer.
Conduction Heat Transfer : Fourier rate equation – General heat conduction equation in Cartesian, Cylindrical and Spherical coordinates.
UNIT – II
Simplification and forms of the field equation – steady, unsteady and periodic heat transfer – Initial and boundary conditions.One Dimensional Steady State Conduction Heat Transfer : Homogeneous slabs, hollow cylinders and spheres – overall heat transfer coefficient – electrical analogy – Critical radius of insulation
One Dimensional Steady State Conduction Heat Transfer : Variable Thermal conductivity – systems with heat sources or Heat generation. Extended surface (fins) Heat Transfer – Long Fin, Fin with insulated tip and Short Fin, Application to error measurement of Temperature.
One Dimensional Transient Conduction Heat Transfer : Systems with negligible internal resistance – Significance of Biot and Fourier Numbers – Chart solutions of transient conduction systems- Concept of Functional Body
UNIT – IV
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 Pi Theorem and method, application for developing semi – empirical non- dimensional correlation for convection heat transfer – Significance of non-dimensional numbers – Concepts of Continuity, Momentum and Energy Equations.
Forced convection: External Flows : Concepts about hydrodynamic and thermal boundary layer and use of empirical correlations for convective heat transfer -Flat plates and Cylinders.
Internal Flows : Concepts about Hydrodynamic and Thermal Entry Lengths – Division of internal flow based on this –Use of empirical relations for Horizontal Pipe Flow and annulus flow.
UNIT – V
Free Convection : Development of Hydrodynamic and thermal boundary layer along a vertical plate – Use of empirical relations for Vertical plates and pipes.
Heat Transfer with Phase Change: Boiling: – Pool boiling – Regimes Calculations on Nucleate boiling, Critical Heat flux and Film boiling.
Condensation: Film wise and drop wise condensation –Nusselt’s Theory of Condensation on a vertical plate – Film condensation on vertical and horizontal cylinders using empirical correlations.
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.
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.