境界層型小型Test Chamberの開発と試験建材表面の化学物質伝達率に関する実験とCFD解析

Abstract

This study is performed as a part of the research that examines the emission and diffusion characteristics of volatile organic compounds (henceforth VOCs etc.) from indoor building materials, such as the material of external diffusion like wet paint. In order to measure convective mass transfer from test building-materials, the authors develop a new type of Small Test Chamber in which precise control of airflow along the test materials can be done. The mass transfers coefficient for the surface of liquid decane is measured by the experiment. In the CFD simulation, liquid benzaldehyde, decane, ethyl benzene, toluene and methyl ethyl ketone are used for modeling the surface material of external diffusion like wet paint. The concentration of VOCs (saturated vapor phase concentration) is given at the material surface as the boundary condition. The emission rates and mass transfer coefficients from the surface of building materials in a Small Test Chamber are predicted on the basis of a low-Reynolds number k-e model (Abe-Nagano model). CFD results show good agreement with the experimental results.