heat transfer, basic of heat transfer with model and example

1. 1
Prepared By: Pritam Bhowmick
Prepared By :Pritam Bhowmick

2.  Name
 Roll Number
 Registration No.
 Department
 Year
 Semester
 Subject
 Subject code
Assignment
:Pritam Bhowmick
:24000721065
: 2124000100720034
: B.Tech in Mechanical Engineering.
: 3rd
: 5th
: Heat Transfer
: PC- ME 501
: CA-1, Fundamental of Heat Transfer,
Conduction of Heat Transfer
2
Prepared By :Pritam Bhowmick

3.  Introduction of Heat Transfer
 Types of Heat Transfer
 Conduction of Heat Tranfer
OBJECTIVES
Prepared By :Pritam Bhowmick

4. “The movement of heat across the bodyof the system due to a
difference in temperature between the system and its suííoundings.” is
called Heat Transfer
Heat always moves from a warmer place to a cooler place.
Hot objects in a cooler room will cool to room
temperature.
Cold objects in a warmer room will heat up to room
temperature.
Prepared By :Pritam Bhowmick

5. Let us consider a system of mass m Kg. In order to compute the relation between the
rises in temperature with the amount of heat supplied, we have to multiply the specific
heat of the system by the mass of the system and the rise in the temperature.
Heat transferred from one system to another system is given by the
following equation, Q= m X c X ΔT
Where Q = Heat Transfer
m = Mass
c = Specific Heat
ΔT = Difference in Temperature
Here, Q is the heat supplied to the system, m is the mass of the system, c is the specific
heat capacity of the system and ΔT is the change in temperature of the system.
Prepared By :Pritam Bhowmick

6. Heat can travel from one place to another in several ways.
The different modes of heat transfer include:
 Conduction
 Convection
 Radiation
Meanwhile, if the temperature difference exists between the two systems,
heat will find a way to transfer from the higher to the lower system.
Prepared By :Pritam Bhowmick

7. Conduction defined as, “The process of transmission of energy from one particle of the
medium to another with the particles being in direct contact with each other.”
An area of higher kinetic energy transfers thermal energy towards the lower kinetic energy
area. High-speed particles clash with particles moving at a slow speed, as a result, slow
speed particles increase their kinetic energy. This is a typical form of heat transfer and
takes place through physical contact. Conduction is also known as thermal conduction or
heat conduction.
 Heat Conduction:
• When you heat a metal strip at one end, the heat travels to the other end.
As you heat the metal, the particles
vibrate, these vibrations make the
adjacent particles vibrate, and so on and
so on, the vibrations are passed along
the metal and so is the heat. We call this?
Conduction
Prepared By :Pritam Bhowmick

8.  Equation of Heat Conduction:
 ľ h e íaīe of conducīion can be calculaīed by īhe
following equaīion:
Q=kA(Thot−Tcold)t
d
◦ Where,
• Q is the transfer of heat per unit time
• K is the thermal conductivity of the body
• A is the area of heat transfer
• Thot is the temperature of the hot region
• Tcold is the temperature of the cold region
• d is the thickness of the body
◦ The coefficient of thermal conductivity shows that a metal body conducts heat
better when it comes to conduction.
8
Prepared By :Pritam Bhowmick

9. Prepared by: Pradip Indra
9
Insulators, such as wood and plastic, do not have this ‘sea of electrons’ which is why
they do not conduct heat as well as metals.
 Conduction through Metal:
 Metals are differentThe outer electrons of metal atoms drift, and are
free to move.
When the metal is heated, this ‘sea of
electrons’ gain kinetic energy and transfer
it throughout the metal.
9
Prepared By :Pritam Bhowmick

10. 10
Prepared By :Pritam Bhowmick

11. 11
Prepared By :Pritam Bhowmick