INTRODUCTORY CONCEPTS AND DEFINITIONS: Modes of heat
transfer: Basic laws governing conduction, convection, and radiation heat
transfer; Thermal conductivity; convective heat transfer coefficient; radiation
heat transfer ; combined heat transfer mechanism. Boundry conditions of 1st,
2nd and 3rd Kind CONDUCTION: Derivation of general three dimensional conduction
equation in Cartesian coordinate, special cases, discussion on 3-D conduction
in cylindrical and spherical coordinate systems (No derivation). One
dimensional conduction equations in rectangular, cylindrical and spherical
coordinates for plane and composite walls. Overall heat transfer coefficient.
Thermal contact resistance.
UNIT II:
VARIABLE THERMAL CONDUCTIVITY: Derivation for heat flow and
temperature distribution in plane wall. Critical thickness of insulation without
heat generation, Thermal resistance concept & its importance. Heat transfer
in extended surfaces of uniform cross-section without heat generation, Long
fin, short fin with insulated tip and without insulated tip and fin connected
between two heat sources. Fin efficiency and effectiveness. Numerical problems
UNIT III:
ONE-DIMENSIONAL TRANSIENT CONDUCTION: Conduction in
solids with negligible internal temperature gradient (Lumped system
analysis), Use of Transient temperature charts (Heisler’s charts) for transient
conduction in slab, long cylinder and sphere; use of transient temperature
charts for transient conduction in semi-infinite solids. Numerical Problems.
UNIT IV:
CONCEPTS AND BASIC RELATIONS IN BOUNDARY LAYERS:
Flow over a body velocity boundary layer; critical Reynolds number; general
expressions for drag coefficient and drag force; thermal boundary layer;
general expression for local heat transfer coefficient; Average heat transfer
coefficient; Nusselt number. Flow inside a duct- velocity boundary layer,
hydrodynamic entrance length and hydro dynamically developed flow; flow
through tubes (internal flow)(discussion only). Numericals based on
empirical relation given in data handbook. FREE OR NATURAL CONVECTION: Application of dimensional
analysis for free convection- physical significance of Grashoff number; use
of correlations of free convection in vertical, horizontal and inclined flat
plates, vertical and horizontal cylinders and spheres, Numerical problems.
PART – B
UNIT V:
FORCED CONVECTIONS: Applications of dimensional analysis for
forced convection. Physical significance of Reynolds, Prandtl, Nusselt and
Stanton numbers. Use of various correlations for hydro dynamically and
thermally developed flows inside a duct, use of correlations for flow over a
flat plate, over a cylinder and sphere. Numerical problems.
UNIT VI:
HEAT EXCHANGERS: Classification of heat exchangers; overall heat
transfer coefficient, fouling and fouling factor; LMTD, Effectiveness-NTU
methods of analysis of heat exchangers. Numerical problems.
UNIT VII:
CONDENSATION AND BOILING: Types of condensation (discussion
only) Nusselt’s theory for laminar condensation on a vertical flat surface; use
of correlations for condensation on vertical flat surfaces, horizontal tube and
horizontal tube banks; Reynolds number for condensate flow; regimes of
pool boiling, pool boiling correlations. Numerical problems. Mass transfer
definition and terms used in mass transfer analysis, Ficks First law of
diffusion (no numericals).
UNIT VIII:
RADIATION HEAT TRANSFER: Thermal radiation; definitions of
various terms used in radiation heat transfer; Stefan-Boltzman law,
Kirchoff’s law, Planck’s law and Wein’s displacement law. Radiation heat
exchange between two parallel infinite black surfaces, between two parallel
infinite gray surfaces; effect of radiation shield; intensity of radiation and
solid angle; Lambert’s law; radiation heat exchange between two finite
surfaces-configuration factor or view factor. Numerical problems.
REFERENCE
TEXT BOOKS:
1. Heat & Mass transfer, Tirumaleshwar, Pearson education 2006
2. Heat transfer-A basic approach, Ozisik, Tata Mc Graw Hill 2002
Reference Books
1. Heat transfer, a practical approach, Yunus A- Cengel Tata Mc
Graw Hill
2. Principles of heat transfer, Kreith Thomas Learning 2001
3. Fundamentals of heat and mass transfer, Frenk P. Incropera and
David P. Dewitt, John Wiley and son’s.
4. Heat transfer, P.K. Nag, Tata Mc Graw Hill 2002..