Heat Transfer & Thermal Machines | Radiation Heat Transfer by Pavan | Learn Smarter
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Radiation Heat Transfer

This chapter explores the fundamental concepts of radiation heat transfer, including the interaction of radiation with materials, the key properties such as emissivity, absorptivity, and reflectivity, and essential laws such as the Stefan–Boltzmann law. It also discusses practical applications, view factors, and methods for calculating radiative exchange between surfaces. The chapter concludes by highlighting the importance of radiation shields in thermal management.

Sections

  • 1

    Interaction Of Radiation With Materials

    This section explores how thermal radiation interacts with different materials through absorption, reflection, and transmission.

    Learning Practice

  • 2

    Radiative Properties

    This section covers the fundamental aspects of radiative properties of materials and the laws governing radiation heat transfer.

    Learning Practice

  • 2.1

    Emissivity (Ε)

    Emissivity is the measure of a material's ability to emit thermal radiation compared to a perfect blackbody.

    Learning Practice

  • 2.2

    Absorptivity (Α)

    This section discusses absorptivity, its definition, relationship with reflectivity, and its role in radiation heat transfer.

    Learning Practice

  • 2.3

    Reflectivity (Ρ)

    Reflectivity (ρ) measures the fraction of incident radiation that is reflected by a material's surface, forming a crucial part of radiation heat transfer.

    Learning Practice

  • 2.4

    Transmissivity (Τ)

    Transmissivity (τ) represents the fraction of incident radiation that passes through a material, playing a significant role alongside absorptivity and reflectivity in describing the radiative properties of materials.

    Learning Practice

  • 3

    Stefan–boltzmann Law

    The Stefan–Boltzmann Law defines the relationship between the temperature of a blackbody and its radiant energy output.

    Learning Practice

  • 4

    Blackbody And Greybody Radiation

    This section explains the concepts of blackbody and greybody radiation, their properties, and their significance in radiative heat transfer.

    Learning Practice

  • 5

    Radiation Heat Transfer Between Surfaces

    This section discusses the principles of radiation heat transfer between surfaces, including the role of emissivity, view factors, and related equations.

    Learning Practice

  • 6

    View Factors (Configuration Factors)

    This section introduces view factors, which are essential for understanding how radiation energy is exchanged between surfaces.

    Learning Practice

  • 7

    Radiosity Method

    The Radiosity Method focuses on the total energy transfer between surfaces in thermal radiation, particularly in enclosures with multiple grey surfaces.

    Learning Practice

  • 8

    Examples: Two-Body Enclosures

    This section introduces the concept of radiation heat transfer between two bodies, outlining essential terms and equations relevant to enclosures.

    Learning Practice

  • 9

    Radiation Shield

    A radiation shield is a thin layer used to reduce net radiation exchange between surfaces, particularly effective in high-temperature scenarios.

    Learning Practice

References

Module IV_ Radiation Heat Transfer.pdf

Class Notes

Memorization

What we have learnt

  • Thermal radiation is energy...
  • Key radiative properties in...
  • Radiation heat transfer cal...

Final Test

Revision Tests