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Droplet size itself is a critical factor for the
inlet air fogging process. The fog droplets quickly
take the velocity of the airflow (within a few centimeters
from the nozzle orifice) and they typically spend
just one to two seconds in the airflow before they
reach the compressor inlet. The droplets must be small
enough that they evaporate, or substantially evaporate,
before reaching the compressor inlet.
The figure below shows a histogram which is output
from the Malvern laser particle analyzer software.
The vertical, red colored bars represent “bins” of
droplet sizes, which can be read off the abscissa.
The volume frequency (as a percent of the total volume)
can be read off the axis on the right side. We see
that the droplets in the 10-micron bin represent about
14% of the total volume of the spray.
The blue colored, s-shaped curve shows the cumulative
volume across the size bins. Examining and reading
from the cumulative volume axis (on the left) we see
that approximately 50% of the volume of the droplets
are about 10 microns or smaller and 90% are less than
18 microns (i.e. the Dv90, or volume/mass mean diameter
is 18 microns).
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MeeFog
Concept
HVAC