Background: Innovative cooling technology is required in every field of life, ranging
from satellite to terrestrial applications. A novel heat rejection system is of great concern for space
applications. Futuristic applications in heat pipe will involve composite structures in various ways
as they offer flexibility in design with their inherent advantage of being lightweight. However, it
remains a challenge to join a composite structure with metals. This study investigates the effect of
a composite section in the adiabatic region of the heat pipe and also proposes a novel approach to
join metals with a composite structure.
Methods: A flexible composite tube, such as carbon fiber, reinforced thermoplastics to make the
adiabatic section. This section is adhesively bonded with the metal tubes, i.e., evaporator and condenser
section. The inherent roughness of the metal tube makes the first layer for mechanical interlocking,
followed by adhesive bonding.
Results: The effect of adiabatic, condenser, and evaporator length, for a normal vs. composite heat
pipe, on specific thermal conductivity is evaluated.
Conclusion: The numerical studies confirm that the use of composite material for the adiabatic
section improves the performance of the heat pipe. It is proposed to use reinforced thermoplastic
as the material for the adiabatic section.