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Effects of Drawing on the Microstructure

The stretch and drawing processes used to make mPOF pose considerable computational challenges, combining as they do non-isothermal, threedimensional (3-D) and time dependent behaviour. This complexity is further complicated if the materials used exhibit significant nonlinear viscoelastic behaviour, while the very nature of an mPOF means that its fabrication involves the substantial deformation of a (potentially large) number of 3-D free surfaces. Unsurprisingly the relevant analytical [Fitt et al. 2002] and numerical [Deflandre 2002, Lyytikäinen et al. 2004] literature is limited. However a convincing story has recently emerged that quantitatively ties together the roles of material properties and tower draw conditions in determining both hole size and shape deformation within an overall MOF structure. This chapter begins with a scaling analysis leading to a suite of dimensionless numbers whose values can be used to assess the relative importance of the viscous, inertial, gravitational and surface tension forces in any particular drawing process. Subsequently both isothermal and non-isothermal drawing are considered. In the former case indicative theoretical analysis is possible, while in the latter it is necessary to rely on numerical modelling. Both hole size and shape changes are considered. Although the focus is on polymer fibres, consideration is also given to silica based microstructured optical fibres so as to highlight the impact of differing material properties. The chapter concludes by considering the impact of hole pressurisation during the draw process.

Keywords

Heat Transfer Capillary Number Biot Number Draw Process Hole Size 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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