Conductive thermal diode based on two phase-change materials

Suraju Olawale Kasali (1, 2) , Jose Ordonez-Miranda (2) , Karl Joulain (2)

1 Department of Physics/Geology/Geophysics, Alex Ekwueme Federal University Ndufu-Alike Ikwo, Ebonyi State, Nigeria
2 TNR - Thermique aux Nano échelles et Rayonnement [Institut Pprime]

The thermal rectification of a conductive thermal diode made up of two phase-change materials, whose thermal conductivities significantly change within a narrow interval of temperatures, is theoretically studied and optimized. This is done by deriving analytical expressions for the temperature profiles, heat fluxes and rectification factor. An optimal rectification factor of 60% is obtained for a thermal diode operating with terminals of VO 2 and Polyethylene with a temperature difference of 250 K spanning the metal-insulator transition of both materials. It is shown that this high rectification of a conductive thermal diode could be maximized even more by increasing the thermal conductivity variations of both diode terminals. The obtained results can thus be useful to guide the development of phase-change materials capable of optimizing the rectification of conductive heat fluxes.

Mots clés: Thermal rectification; conductive thermal diode; phase-change materials

Domaines: Science non linéaire [physics]; Physique [physics]

Suraju Olawale Kasali, Jose Ordonez-Miranda, Karl Joulain. Conductive thermal diode based on two phase-change materials. International Journal of Thermal Sciences, 2020, 153, ⟨10.1016/j.ijthermalsci.2020.106393⟩. ⟨hal-03017600⟩