5. Comparison of different heat transfer modes
The thermal powers exchanged by an assumed very large surface at temperature T are shown in figure 14. These comparative powers are generated at a temperature difference of 1 K :
by radiation between two walls ;
by conduction in helium between two walls separated by 1 cm ;
by natural or forced convection in helium around a horizontal rod 1 cm in diameter; in the case of forced convection, helium is assumed to move around the rod at a speed of 1 m/s.
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Comparison of different heat transfer modes
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