JNTUK- B.Tech 3-2 Sem HEAT TRANSFER Subject Material

JNTUK- B.Tech 3-2 Sem HEAT TRANSFER Subject Material

UNIT-1

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.

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UNIT - 2

Steady, unsteady and periodic heat transfer - Initial and boundary conditions.

ONE DIMENSIONAL STEADYSTATE CONDUCFIONHEAT TRANSFER:

Homogeneous slabs, hollow cylinders and spheres - overall heat transfer coefficient - electrical analogy - Critical radius of insulation.

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.

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UNIT-3

ONE DIMENSIONAL TRANSIENT CONDUCTION HEAT TRANSFER:

Systems with negligible internal resistance - Significance of Biot and Fourier Numbers - Chart solutions of transient conduction systems

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UNIT-4

CONVECTIVE HEAT TRANSFER: Classification of convective heat transfer - dimensional analysis as a tool for experimental investigation – Buckingham Pi Theorem for forced and free convection, application for developing semi-empirical non- dimensional correlation for convective heat transfer -Significance of non-dimensional numbers ~ concepts of continuity, momentum and Energy Equations.

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UNIT-5

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.

FREE CONVECTION: Development of Hydrodynamic and thermal boundary layer along a vertical plate ~ Use of empirical relations for Vertical plates and pipes.

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UNIT-6

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. `

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UNIT-7

HEAT EXCHANGERS: `

Classification of heat exchangers - overall heat transfer Coefficient and fouling factor - Concepts of LMTD and NTU methods - Problems.

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UNIT-8

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.

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