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Sprial |
- SPIRAL-C (6/93)
fits spiral-flow data by combining simplex method with
finite-difference simulation of unsteady, non-isothermal flow
in spiral cavity of rectangular cross-section (with width
>> half-gap thickness) subject to imposed experimental pressure
trace at inlet (under or near sprue); generates values for
either 4-constant (n, A, Ta, b), 5-constant (n, tau*, B, Tb,
beta) or 7-constant (n, tau*, D1, D2, D3, A1, Ã 2) viscosity
models; in addition to fitting the spiral-flow lengths, has
option to also fit downstream pressure traces (thereby exploiting
more information from each run); the 4-constant model can
also be augmented with an effective no-flow temperature (Tcryst),
for handling semi-crystalline materials; when running the
5-constant or 7-constant viscosity model, execution time can
be reduced by an order of magnitude by invoking a local power-law
approximation
- SPIRAL-G (6/93)
extension of SPIRAL-C to include variable-density effects,
including handling of shrinkage which arises after melt front
stops; very computationally intensive
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