A Numerical Model of Bubbling Thermoplastics
A Numerical Model of Bubbling Thermoplastics
A Numerical Model of Bubbling Thermoplastics
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Bubble Growth<br />
• <strong>Model</strong>s<br />
– Infinite domain; finite radius<br />
– Temperature gradients – radial<br />
– Dominant mechanism depends on size<br />
• Surface tension, inertia, evaporation<br />
1/<br />
2<br />
R ∝<br />
t<br />
– Diffusion-driven:<br />
– Polymer melt: between Newtonian fluid and diffusiondriven<br />
growth<br />
• Secondary nucleation<br />
– In strongly viscoelastic liquids