Characteristics of Particles and their Behaviour in
Ventilation Air
G Einberg
and S Holmberg
Dept.
of Constructional Engineering and Design,
Royal Institute of Technology, KTH Syd,
SE –136 40 Haninge,
Marinens väg 30, Sweden
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Abstract
The behaviour of particles in air flow is
important for identifying those in various locations in ventilated space.
The main reason for this study is to propose a new modelling concept to
determine a realistic distribution of particles of different sizes in a
space. The goal for this investigation is to divide particles into groups
according to their behaviour in air and to improve the existing settling
model. The growth of particle aerodynamic diameter in higher relative
humidity is also presented. Here, growth of diameter and coagulation is
used to determine the control volume concentration. The finite volume
method is used to describe the particle concentration in the computational
domain. A background to particle properties and theory for calculations
are given for this purpose. Results from the literature survey reveal that
modelling needs a more systematic approach to cover all sizes of particles
with clear classification by behaviour.
Key words: particle behaviour, particle size, numerical modelling, occupied zone, air flow,
control volume, review.
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