5% - eTheses Repository - University of Birmingham

Chapter 5
Velocity Y Inertia Y Lift Y •-Drag Y •Y position
15 T Non-dimens.
10 -
force and
distance
10
Non-dimensional time
15 20 25 30 35
Figure 7n. The temporal fluctuation in the magnitude of
vertical components of the forces acting on a particle falling
along trajectory F in figure 7b. The third peak forms on figure
7c because the particle reaches the cusp point where it is
virtually stationary for an extended period.
Buoyanc PI+D+L (Y dir) — Y position Sum X Forces
5 T Non-dimens.
s. force and
\ distance
Non-dimensional time
10 15 20 25
Figure 7o. The sum of the forces balances the buoyancy force
on the particle at the cusp point.