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Laws Of Radiation Heat Transfer – Wien’s Law, Kirchhoff’s Law And Stefan-Boltzmann Law

🔗 Modes of Heat Transfer Conduction, Convection, Advection and Radiation 🔗 Fourier’s Law of Heat Conduction   Wien’s displacement law and ...

Laws Of Radiation Heat Transfer – Wien’s Law, Kirchhoff’s Law And Stefan-Boltzmann Law



Wien’s displacement law and equation

Wien’s law states that in a black body radiation the wavelength of radiation corresponding to the maximum energy is inversely proportional to the temperature of the body.

Explain Fourier’s Law of Heat Conduction - Assumption, Essential Features and Equation

🔗Modes of Heat Transfer Conduction, Convection, Advection and Radiation

Assumptions of Fourier’s law

The Fourier's law based on the following assumption:

1. The material is homogeneous and isentropic, meaning that the value of thermal conductivity is constant in all direction.

2. Isothermal bounding surfaces.

3. Heat conduction takes place in the steady-state.

4. Heat flow is unidirectional (from higher temperature to lower).

Modes of Heat Transfer Conduction, Convection, Advection and Radiation

What is heat transfer?

Heat transfer is defined as the transmission of energy from one region to another. It is occurring as the result of temperature difference. So, the temperature difference is the driving force of heat transfer. It happened in one or a combination of the following primary modes 1) Conduction, 2) Convection, 3) Radiation


In each mode, the heat exchange occurs in the same direction that is from higher temperature to lower temperature. However, each has different controlling laws.

What Is the Difference Between Clutch and Coupling?

🔗What is Shaft Coupling? its Advantages and Requirement

🔗What is clutch? Types of clutches

Comparison between clutch and shaft coupling?



Clutch is a device that provides a temporary connection between the driver and driven shaft.


Coupling makes the permanent and semi-permanent connection between two shaft ends.


Used where driven shaft/ driven machine required to be in intermittent service.


Coupling used where driven shaft required to be in continuous service.


Clutch allow disconnection during the operation. Provide a mechanism for rapid engagement and disengagement during the operation at the operator will.


It does not allow disconnection of the shaft during the normal operation (Torque limiting coupling allow slipping when torque limit is exceeded). Connection is in permanent nature, so there is no mechanism for quick connection and disconnection.


What Is Shaft Coupling? Its Advantages, Requirement, Types

shaft coupling

What is shaft coupling?

Shaft cannot be made for very long due to its inconvenience of transport. The shaft coupling is a mechanical device that connects two shafts together at its end in order to have a greater length for transmitting power. Even though its primary function is transmitting power, it also enables some end movement and degree of misalignment.

Explain Stress Strain Diagram - Elastic Limit, Yield Point, Ultimate Stress, Breaking Stress


For designing machine parts, it is crucial to know how the material function in service. For this purpose, certain mechanical characteristics of material is determined from a standard tensile test. This is a destructive test that consists of gradually loading the specimen material and noting the corresponding change in the specimen's length and diameter until it fractures. This test is done by a universal testing machine (UTM).