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Phoretic
and Stefan flow effects are generally small.
However, for particles in the range of 0.1 - 1.0 μm diameter, which
have low deposition velocities, these effects may not always be negligible. Therefore, the ability to specify a phoretic term to the deposition
velocity is added (i.e., vd˘ = vd + vd(phor),
where vd˘ is the modified deposition velocity
and vd(phor) is the phoretic term).
Although
the magnitude and sign of vd(phor) will vary, a small, constant
value of + 0.01 cm/s is used in the present implementation of the model to
represent combined phoretic effects.
1.3.3 Point and Volume Source Emissions
As
stated in Equation (1-59), deposition is modeled as the product of the
near-surface concentration (from Equation (1-1)) times the deposition velocity
(from Equation (1-80)). Therefore, the
vertical term given in Equation (1-54) that is used to obtain the concentration
at height z, subject to particle settling and deposition, can be evaluated at
height zd for one particle size, and multiplied by a deposition
velocity for that particle size to obtain a corresponding "vertical
term" for deposition. Since more
than one particle size category is typically used, the deposition for the nth
size category must also include the mass fraction for the category:
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