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Convection.
convection
Heat transfer by Brownian motion takes place only in fluids (liquids, gases, and plasmas).
the same amount of heat takes place in the inner and outer of a silencer because the silencer is a metal
The foil reflects the heat back to the radiator thus reducing convection off of the radiator.
In all circumstances where a material is hotter than its surroundings, heat transfer takes place.
conduction
Convection.
convection
Heat transfer by Brownian motion takes place only in fluids (liquids, gases, and plasmas).
Convection
the same amount of heat takes place in the inner and outer of a silencer because the silencer is a metal
The foil reflects the heat back to the radiator thus reducing convection off of the radiator.
The transfer of heat in the water and in other liquid takes place by the movement of Molecules from the source of heat to the other part of liquid.This results the Boiling in the liquid.
Thermal
the aluminum insulates the heat and keeps it in there so no heat to get out if so only a little will
Only by radiation, if not screened and by conduction, if mounted on a thermal conductor (heat sink)