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The Particle
Couette Facility has been designed for the measurement
of the drag and lift coefficient on a single pollen grain.
The facility consists of two concentric perspex cylinders
that can both be rotated at a maximum speed of 3600 rpm.
Pollen is being injected into the annulus through a specially
designed injection chamber
that is remotely controlled. In order to measure the drag
and lift force on a single pollen particle, quadruple exposure
PIV technique is used to both resolve the velocity and acceleration
field. This information is used to solve the force balance
on a single pollen grain.
The drag and lift
coefficients are required to model suspension away from
the anther and subsequent transport into the atmosphere
at the larger scales.
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