Compare the axial heat flux achievable by a heat pipe using water as the working fluid with that of a silver rod. Assume that both are 20 cm long, that the temperature difference for the rod from end to end is 100°C and that the heat pipe operates at atmospheric pressure. State your other assumptions.

GIVEN

• Silver rod and a heat pipe, both 20 cm long
• End-to-end temperature difference of 100°C
• Heat pipe operates at atmospheric pressure

ASSUMPTIONS

• Neglect heat pipe vapor pressure drop
• Horizontal operation for the heat pipe
• Perfect wetting of the heat pipe fluid, θ = 0