Radiation with Internal Heat Source — Lesson 5

This lesson covers the complex problem of heat radiation transfer between two surfaces, with a focus on the diffusion approximation method. It discusses the role of emissivity, absorption and scattering coefficients, and the extinction coefficient in the process. The lesson also explains the first law of Thermodynamics and its application in solving the differential equation for temperature distribution. It further delves into the boundary conditions and the concept of flux continuity. The lesson concludes with an exploration of radiative equilibrium and the impact of internal heat generation on temperature distribution and heat flux. An example of a slightly complicated problem of heat radiation transfer between two plates is used to illustrate these concepts.

Video Highlights

00:24 - Explanation of the concept of emissivity, epsilon one and epsilon two
09:02 - Explanation of the concept of flux continuity
21:14 - Discussion on the importance of internal heat generation in the problem
33:33 - Explanation of the concept of optical depth
45:28 - xplanation of the concept of radiative equilibrium in cylindrical geometry

Key Takeaways

- Emissivity, absorption and scattering coefficients play a crucial role in heat radiation transfer.
- The extinction coefficient is the sum of absorption and scattering coefficients.
- The first law of Thermodynamics is crucial in solving the differential equation for temperature distribution.
- Boundary conditions and the concept of flux continuity are important in solving heat radiation transfer problems.
- In radiative equilibrium, internal heat generation can significantly impact temperature distribution and heat flux.