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Porous media to intensify natural convection in rectangular enclosures used in building techniques

Identifiers
URI: http://hdl.handle.net/20.500.12251/1973
ISSN: 01291831
DOI: 10.1142/S0129183120500618
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Author
Baïri, Abderrahmane; Martín Garín, Alexánder; Millán García, José Antonio
Date
2020
Subject/s

Muro Trombe

Transferencia de calor por convección

Aislamiento térmico

Comportamiento térmico

Envolvente de edificio

Ensayos (propiedades o materiales)

Conductividad térmica

Transmisión de calor en edificación

Ahorro energético

Simulación energética - herramientas

Unesco Subject/s

2211.29 Propiedades Térmicas de Los Sólidos

2213.10 Relaciones Termodinámicas

3311.16 Instrumentos de Medida de la Temperatura

3312.08 Propiedades de Los Materiales

3312.12 Ensayo de Materiales

3322.04 Transmisión de Energía

2501.21 Simulación Numérica

Abstract

This numerical study quantifies the natural convective heat transfer occurring in an elongated rectangular cavity whose hot vertical wall generates a constant heat flux while the opposite one is kept isothermal at cold temperature. The study shows that when a layer of porous material is affixed to the hot wall, the aerodynamic phenomena are modified and increase the natural convective transfer. Several configurations were processed, obtained by varying the matrix's thermal conductivity of the layer, the aspect ratio of the cavity and the Rayleigh number in wide ranges. The numerical solution is obtained by means of the control volume method based on the SIMPLE algorithm. A correlation of the Nusselt-Rayleigh type is proposed, allowing determination of the convective heat transfer for any combination of these physical parameters. It can be applied in various engineering fields including passive heating in building which can be improved by the simple and easy-to-implement assembly version discussed here. © 2020 World Scientific Publishing Company.

This numerical study quantifies the natural convective heat transfer occurring in an elongated rectangular cavity whose hot vertical wall generates a constant heat flux while the opposite one is kept isothermal at cold temperature. The study shows that when a layer of porous material is affixed to the hot wall, the aerodynamic phenomena are modified and increase the natural convective transfer. Several configurations were processed, obtained by varying the matrix's thermal conductivity of the layer, the aspect ratio of the cavity and the Rayleigh number in wide ranges. The numerical solution is obtained by means of the control volume method based on the SIMPLE algorithm. A correlation of the Nusselt-Rayleigh type is proposed, allowing determination of the convective heat transfer for any combination of these physical parameters. It can be applied in various engineering fields including passive heating in building which can be improved by the simple and easy-to-implement assembly version discussed here. © 2020 World Scientific Publishing Company.

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