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Thermal rectification ratios of solid-liquid phase change thermal diodes(SL-PCTDs) are not sustainable beyond a certain temperature bias, necessitatingreasonably compatible designs. Manipulating the heat transfer in the forwardand reverse directions of the SL-PCTD is of great practical interest to achievepersistent performance. Herein, a SL-PCTD prototype is investigated under thesupercooling effect of a phase change material (calcium chloride hexahydrate).In the forward direction, supercooling effect plays a significant role insustaining natural convection far below the melting temperature (30 C), whichleads to robust heat transfer within a temperature bias of 10-40 C. While inthe reverse direction, dislodging the supercooling via manual supercoolingrelease (MSR) within a large temperature range of 30-7 C tends to greatlyinhibit heat transfer. As a consequence, thermal rectification ratio of 2.95 isachieved, which is competitively sustainable at large temperature bias comparedto the SL-PCTD without supercooling effect. To address the effect ofsupercooling on thermal rectification comprehensively, thermal resistanceapproach is applied to theoretically model the SL-PCTD, which shows a goodagreement with experimental data. Such a device with supercooling control inonly one direction is further named as the SL-PCTD with gating functionality,where manipulating supercooling effect of phase change material opens up afeasible avenue for enabling generalized thermal diode.

Thermal Rectification of Solid-liquid Phase Change Thermal Diode under the Effect of Supercooling