JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-requisite

Thermodynamics

Course Objective

To apply the principles of heat transfer in the design of thermal systems

Course Outcomes

At the end of the course, the student should be able to

• Mathematically model heat and mass transfer and fluid flow problems and to be able to apply different boundary conditions
• Solve the simple heat and mass transfer and fluid flow problems using analytical methods and appreciate the need of numerical methods to solve complicated problems
• Apply semi empirical formulae to determine the heat transfer parameters and use different techniques, viz., experimental, analytical and semi empirical methods to design the thermal systems.

UNIT - I

Introduction to Different Modes of Heat Transfer: Governing Laws and mathematical models -Initial and boundary conditions. Heat Conduction – Development of Governing equation for 1D, 2D and 3D; steady and transient heat conduction – Solution of 1D steady state heat conduction – Composite Systems. Systems with heat generation – Variable thermal conductivity – Fins 2D Steady State Heat conduction – Use of conduction shape factors – Use of analytical method for temperature distribution in a slab for simple boundary conditions

UNIT - II

Transient heat conduction: Lumped system analysis-Infinite Bodies - Heisler charts-semi infinite solid - 2D transient heat conduction using product solutions. Forced Convection: Equations of fluid flow-concepts of continuity, momentum equations-derivation of energy equation-methods to determine heat transfer coefficient: Analytical methods-dimensional analysis and concept of exact solution. Approximate method-integral analysis – Von Karman Integral Momentum and Energy Equations – Determination of laminar heat transfer coefficient for different velocity and temperature profiles for flow over a flat plate

UNIT - III

External flows: Flow over a flat plate: Application of empirical relations to various geometries for laminar and turbulent flows. Internal flows: Flow Classification based on hydrodynamic &thermal entry lengths- Fully developed flow: integral analysis for laminar heat transfer coefficient-constant wall temperature and constant heat flux boundary conditions-; use of empirical correlations for determination of heat transfer coefficient and friction factor for different types of internal flow applications.

UNIT - IV

Free Convection: Approximate analysis on laminar free convective heat transfer-Boussinesque approximation-different geometries-combined free and forced convection. Boiling and condensation: Boiling curve-correlations-Nusselt’s theory of film condensation on a vertical plate-assumptions & correlations of film condensation for different geometries.

UNIT - V

Radiation Heat Transfer: Radiant heat exchange in gray, non-gray bodies, with transmitting. Reflecting and absorbing media, specular surfaces, gas radiation-radiation from flames.

Mass Transfer: Concepts of mass transfer-diffusion & convective mass transfer analogies-significance of non-dimensional numbers. Recent Advances in Heat and Mass Transfer Applications.

TEXT BOOKS:

• 1. Fundamentals of Heat Transfer by Incropera & Dewitt, John Wiley.
• 2. Heat Transfer by Necati Ozisik, TMH.
• 3. Heat Transfer: A Conceptual Approach by P K Sharma and K Rama Krishna.

REFERENCE BOOKS:

• 1. Heat Transfer by Holman J.P, Mc Graw Hill Publication.
• 2. Heat Transfer by Gregory Nellis & Sanford Klein, Cambridge University Press.
• 3. Principals of Heat Transfer by Frank Kreith, Cengage Learning.
• 4. Introduction to Heat Transfer by SK Som, PHI.
• 5. Heat Transfer by Nellis & Klein, Cambridge University Press, 2012.
• 6. Engineering Heat & Mass Transfer by Sarit K. Das, Dhanpat Rai.
• 7. Heat Transfer by P. K. Nag, TMH. M.Tech, I Year, II Sem