Heat Transfer In A Vacuum. Thermos tm is true vacuum path hence the complications with glass or metal vecuum flasks. Heat is first transferred from the hot gas to the fins and then to the tubes by convection then through the tube wall by conduction and finally from the tube interior to the cold fluid inside the tube again by convection.
For example transfer of heat from the sun to earth takes place through vacuum space. Overcoming common obstacles in vacuum heating can lead to a better process. Heat is first transferred from the hot gas to the fins and then to the tubes by convection then through the tube wall by conduction and finally from the tube interior to the cold fluid inside the tube again by convection.
The thinness of the walls stops heat entering or leaving the flask by conduction.
Radiation in this process the energy is in form of wave particle can pass through vacuum space. The vacuum prevents conduction from occurring because there is no air and therefore no atoms for these heat transfers to take place. How is radiation heat transfer different from conduction heat transfer. 1 the latent heat transfer accompanying the transmembrane vapour flux and 2 the heat transferred by conduction through the membrane matrix.