This lecture explains mode of heat transfer

1. DEPARTMENT OF MECHANICAL ENGINEERING
R. N. G. PATEL INSTITUTE OF TECHNOLOGY-RNGPIT, Bardoli
[Formerly known as FETR]
HEAT TRANSFER
SUBJECT CODE: 2151909 | B.E. 5th SEMESTER
Dr. JITENDRA B. CHAUDHARI
Assistant Professor
Email: jbc.fetr@gmail.com, M: 960 156 4684
Topic Title: Introduction to Heat Transfer
M. Tech, (Turbo-Machines) Ex. Design Engineer, Hindustan Aeronautics Ltd. HAL
Ph.D., (Combustion Technology) Ex. Production Engineer, Suzlon Energy Ltd.
Lecture: 01

2. Understanding of Heat
Phase of Substance
Molecules/Atom Always in Motion- KEMolecules/Atom Always in Motion- KE

3. Mode of Heat Transfer
Measure of Average KE PE
• Heat is Average Kinetic and Potential Energy of
all molecules of a substance.
• We can measure it in terms of Temperature.

4. Specific Heat and Latent Heat
When we add
20 0C Equilibrium
State 1 KE level 1
When we add
Heat, it is stored in
the three Pockets-
VKE, RKE, TKE
21 0C Equilibrium
State 2 KE Level 2

5. Mode of Heat Transfer
Conduction
Mechanism of HT: Lattice Vibration & free Electron
Phase : Solid
Law of HT : Fourier’s Law
Parameter : Thermal Conductivity k,
Temp Difference, Area

6. Mechanism of HT: Molecular Motion / Collision
Phase : Liquid, Gaseous
Law of HT : Newton’s Law of Cooling
Parameters : Convective Heat transfer coefficient h,
Temp Difference, Area, Density , Velocity
Mode of Heat Transfer
Convection

7. Mechanism of HT: Electromagnetic Wave
Phase : No Molecules is required
Law of HT : Stefan Boltzman’s Law
Parameters : Temperature, Emissivity of
surface, Type of surface
Mode of Heat Transfer
Radiation

8. Mode of Heat Transfer

9. THANK YOUTHANK YOU