fredag 25 november 2011
Radiative vs Turbulent vs Frictional Heating
Mathematical Physics of Blackbody Radiation and Computational Turbulent Incompressible Flow (or Computational Thermodynamics) show a similarity between radiative heating and turbulent heating, which can be viewed as different forms of frictional heating.
In both cases the heating effect shows to be independent of the small coefficient of dissipation/friction connected to the heating (the viscosity in turbulent flow and coefficient of the Abraham-Lorentz recoil force in radiation).This means that macroscopic quantities such as total radiative and turbulent heating show to be insensitive to the absolute scale of the microscopic dissipation creating the heating.
This allows computational simulation of macroscopical features of radiation and turbulent flow without resolution to actual smallest physical scales. This makes in particular turbulent flow computable contrary to common perceptions of state-of-the-art.
One may compare making fire by friction with a bow and drill: What is important is the total power invested, not the specific dimensions of the bow and drill.