Should Different Gaseous Contaminants Be
Treated Differently In CFD Indoor Simulations?
Author(s)
R. N. Zhuang, X. Li & J. Tu
Abstract
Gaseous contaminants such as volatile organic compounds (VOCs) are the major
contaminants in indoor air. As there are hundreds of VOCs existing in the indoor
environment simultaneously, many CFD practitioners may wonder: should
different VOCs be treated differently in CFD indoor simulations? A key factor in
CFD simulation to distinguish different VOCs is the kinetic diffusivity, which is
negatively associated with the molar mass of a gaseous contaminant, thus could
differ a lot for different VOCs. If there are significant discrepancies in transport
behaviours of different VOCs, the reason could be due to large differences in
their diffusivities. In order to find out the answer of the question in the title of
this paper, this study designed a CFD model in which two imaginary VOCs were
emitted from the same location at the same emission rate; the only difference is
that the diffusivity of the lighter VOC is eight times as much as the diffusivity of
the heavier VOC. Simulation results showed that, in terms of steady state, the
distribution patterns of different VOCs were almost the same in a normally
ventilated room. Therefore all gaseous contaminants can be treated in the same
way by applying a typical diffusivity value 10-5 m2/s in CFD simulation.
Keywords
gaseous contaminant, VOC, diffusivity, CFD, indoor air.
Related Book
Other papers in this volume
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