NFX CFD
Overview
This video analyzes radiative heat transfer, focusing on the transfer of thermal energy through electromagnetic waves without contact or fluid flow. It introduces emissivity and the Stefan–Boltzmann law, including the role of radiation in high-temperature systems.
Radiation Analysis Workflow :
• Radiation Theory & Surface Properties
The video explains emissivity, which describes how effectively a surface emits radiative energy, and the Stefan–Boltzmann law, which shows that radiative heat transfer scales with the fourth power of absolute temperature.
• Cavity Radiation & Analysis Setup
Using an insulated outer chamber, a metal inner chamber, and glass plates, the analysis defines Cavity Radiation conditions between each pair of surfaces to establish how they exchange heat. Because buoyancy from temperature differences is also active, the model uses a compressible setup with an absolute-temperature reference and is run as a transient case.
• Temperature Distribution & Radiation Results
The results compare temperature distributions across chamber cross-sections and on individual glass plates, showing how heat is carried and accumulated through radiation.
The video demonstrates how radiative heat transfer can be used to analyze the thermal behavior of high-temperature systems that cannot be explained by convection or conduction alone.
Download Example Files
Radiation Analysis Workflow :
• Radiation Theory & Surface Properties
The video explains emissivity, which describes how effectively a surface emits radiative energy, and the Stefan–Boltzmann law, which shows that radiative heat transfer scales with the fourth power of absolute temperature.
• Cavity Radiation & Analysis Setup
Using an insulated outer chamber, a metal inner chamber, and glass plates, the analysis defines Cavity Radiation conditions between each pair of surfaces to establish how they exchange heat. Because buoyancy from temperature differences is also active, the model uses a compressible setup with an absolute-temperature reference and is run as a transient case.
• Temperature Distribution & Radiation Results
The results compare temperature distributions across chamber cross-sections and on individual glass plates, showing how heat is carried and accumulated through radiation.
The video demonstrates how radiative heat transfer can be used to analyze the thermal behavior of high-temperature systems that cannot be explained by convection or conduction alone.