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High Thermal Rectifications Using Liquid Crystals Confined into a Conical Frustum

Silva, José Guilherme ; Fumeron, Sébastien ; Moraes, Fernando ; Pereira, Erms

Brazilian journal of physics, 2018-08, Vol.48 (4), p.315-321 [Revista revisada por pares]

New York: Springer US

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Título:
High Thermal Rectifications Using Liquid Crystals Confined into a Conical Frustum
Autor: Silva, José Guilherme ; Fumeron, Sébastien ; Moraes, Fernando ; Pereira, Erms
Materias: Analogs ; Capillary tubes ; Carbon nanotubes ; Chemical Sciences ; Condensed Matter ; Crystal defects ; Diodes ; Display devices ; Electronic devices ; Energy consumption ; Energy sources ; Finite element method ; Fourier's equation ; Frustums ; Heat ; Heat flux ; Heat transfer ; Liquid crystals ; Molecular chains ; Molecular structure ; Nanostructured materials ; Nematic crystals ; Physics ; Physics and Astronomy ; Thermal conductivity
Es parte de: Brazilian journal of physics, 2018-08, Vol.48 (4), p.315-321
Descripción: In recent years, phononics, that studies thermal analogs of electronic devices, has become an important subject due to the need for better use of energy resources influenced by growing demand. On developing of these analogs, for example, thermal diodes, a successful route is the design of nanostructured materials (e.g., carbon nanotubes). However, these materials entail increased costs due to the use of complex techniques/equipments, while alternative cheaper materials present nearly comparable efficiency. In this work, we investigate how a thermal diode made by an alternative material (nematic liquid crystal), confined in a conical frustum capillary, can be optimized to achieve high rectifications. In such capillary tube, the thermotropic nematic liquid crystal 5CB produces an axially anisotropic defect called escaped radial disclination. With the molecular director field of such structure, we obtain the thermal conductivity tensor of the diode and solve the steady-state regime of Laplace and Fourier equations using the finite element method. We observed the anisotropy of the system with the non-linear temperature dependences of the molecular thermal conductivities that rectify the heat flux at rates up to 1266% at room temperature. Studying the sensitivity of the system with respect to shape and molecular and thermal aspects, we found that the improved thermal diode is suitable to be miniaturized and applied on well-determined areas, and it is robust against variations of the inward pumped heat flux. This work contributes to the usage of liquid crystals in non-display devices, having potential applications on controlling the heat flux through surfaces.
Editor: New York: Springer US
Idioma: Inglés

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High Thermal Rectifications Using Liquid Crystals Confined into a Conical Frustum

Silva, José Guilherme ; Fumeron, Sébastien ; Moraes, Fernando ; Pereira, Erms

New York: Springer US

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