Double Diffusion in Enclosure Bounded by Massive and Volatilizing Walls

Abstract

Hazard volatilization emitted from walls enters into airflow in the room, making the indoor air quality worse. An exterior wall of some thickness is affected on its surface by the outdoor air environment. In this paper, conjugated double diffusive natural convection in square enclosure bounded by massive and volatilizing walls is numerically studied. Various parameters, including dimensionless heat and mass conductivities of the bounding wall (Rt and Rc, 10-4-10.0) and Buoyancy ratio (N, 0-10), are considered. Other governing parameters are maintained constant (Rayleigh number, Prandtl number, Lewis number and width ratio of massive wall to enclosure). The conjugate heat transfer of the thick wall and indoor airflow and the enhanced heat transfer and combined double diffusion are analyzed. The isotherms, concentration, streamlines or flow charts, and wall Nusselt numbers are produced for various cases, which should be interest for design of indoor environments and selection of building materials.