Manipulating thermal waves with path-dependent diamond-shaped metadevices

Abstract

Thermal waves generated via conduction and convection processes have recently received considerable attention due to some special phenomena on thermal managements. The existing manipulation effects of thermal waves lack the responses to the path-dependent multi-function and intelligent switchable effects. In order to overcome these limitations, the Janus metadevice composed of fluid and solid in a porous medium is designed, which can realize the path-dependent manipulation effects of thermal waves without disturbing the temperature and pressure profiles in the background. The anisotropic material parameters of the Janus metadevice could be theoretically obtained by means of the successive coordinate transformations to realize the proposed manipulation behaviors. Then, combining all the material and geometric parameters, boundary conditions, and initial values, the numerical simulations are performed to demonstrate the effectiveness of the path-dependent manipulation functionalities. The intelligent switchable effects corresponding to temperature and pressure are also theoretically achieved, which enables the Janus metadevice to realize the path-dependent functionalities at pre-controlled temperature and pressure intervals flexibly, and the functionalities will be turned off automatically as the environment exceeds the pre-controlled intervals. This article may pave a way to manipulate the thermal waves in a path-dependent manner, and the temperature-pressure-dependent switchable properties can also greatly widen the application fields of this intelligent device.