High Temperature Engineering 1

kernel
heat transfer includes heat conduction, convection and radiation.
1. heat conduction
(a) steady:
the most important problem is to find out the distribution in the temperature field combining Fourier's differential equation of heat conduction and boundary condition. then we can calculate the heat flux by using Fourier's law.
most common cases: >one-dimensional plane wall >one-dimensional cylindrical wall >sphere >extended surfaces
(b) transient:
Fourier's differential equation of heat conduction with boundary condition and initial condition ---> temperature field which includes Biot number and Fourier number
most common cases: >planar wall with convection >infinite long cylinder with convection >sphere with convection >semi-infinite solid
2.Radiation
(a) single body radiation
key concepts: emission, irradiation, radiosity, solid angle
radiation intensity for blackbody from Plank distribution ----> Stefan-Boltzmann law
(b) radiation exchange among several bodies
key concepts: view factors, blackbody radiation exchange, diffuse grey surfaces radiation exchange