Abstract
Harvesting thermal energy from arbitrary directions has become an exciting theoretical possibility. However, an exact 3D thermal energy harvester is still challenging to achieve for the stringent requirement of highly anisotropic and symmetrical structures with homogenous materials, as well as absence of effective characterization. In this Communication, a flower‐shaped thermal harvesting metamaterial is originally promoted. Numerical simulations imply that heat flux can be concentrated into the target core and a temperature gradient turns out to be more than two times larger than the applied one without obvious distortion or perturbation to the temperature profile outside the concentrator. Temperature transitions of the actual device are experimentally measured to validate the novel structure with consistency of the simulated results with original methods. With ultraefficiency independent of geometrical size, the flower‐shaped thermal harvester facilitates multiple scale energy harvesting with splendid efficient and might help to improve thermoelectric devices efficiency in a totally new perspective.
Highlights
Harvesting thermal energy from arbitrary directions has become an exciting overheating.[14,15] Thermal concentrators, based on heat current manipulation, theoretical possibility
Since such thermal concentrators were dependent on rubber or epoxy, they were impossible to operate under high temperature and weak guiding significance for multiple scale practical applications
Heat current was theoretically and experi- harvesters are presented in this Communication
Summary
Harvesting thermal energy from arbitrary directions has become an exciting overheating.[14,15] Thermal concentrators, based on heat current manipulation, theoretical possibility. With thermal energy efficiently more than double harvested: with artificial materials.[11,12,13] Thermal cloaks were first theo- enhance of temperature gradients and heat flux, numerical and retically proposed for transient protection of the object from experimental results open up intriguing possibilities in a future all-in one system, with a wide variety of potential applications The considered space, including the inner core (0 ≤ r ≤ a) and exterior region (r ≥ b), was made of a homogenous and isotropic background material with thermal conductivity of κ1, while a homogenous host material with its thermal conductivity of κ2 was employed to the flower-shaped functional structure region (a ≤ r ≤ b).
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