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5% - eTheses Repository - University of Birmingham

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the blue squares to double loops and so on, up to the blue<br />

diamonds, representing nine loops. Higher order looping has been<br />

excluded for the sake <strong>of</strong> figure clarity -<br />

All cases up to the upper green line marked LE represent<br />

effective trapping within the core, at least up to the 1000s time<br />

period computed. Above the LE line and below the line E there<br />

is a region where the particle completes one loop before being<br />

expelled from the core. There does not appear to be any<br />

condition corresponding to multiple loops, perhaps due to the<br />

increments selected for increases in A0 . An analytical solution<br />

to this problem would certainly aid interpretative diagnosis <strong>of</strong><br />

the physical sensitivities, including the limiting conditions at<br />

each end which may tail asymptotically to infinity or simply<br />

terminate on the axis.<br />

3.2 Different values <strong>of</strong> V & G<br />

The effect on the parameter space <strong>of</strong> varying V and G are<br />

presented below, followed by correlations <strong>of</strong> the results in terms<br />

<strong>of</strong> equations for the bounding lines denoting capture from escape.<br />

The correlations are not physically based on first principles but<br />

they do deliver simplicity for the broader discussion with which<br />

we close this chapter.<br />

a) Varying particle fall speed. Varying V has a marked effect<br />

on the location <strong>of</strong> the central region as shown in figure 5. Here<br />

G=0.01m/s and the four cases show different V=0.0335, 0.076,<br />

6-9

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