Effect of Cross Section of Spandex Yarn on Air Drag.

概要

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The effect of the yarn cross section on the air drag coefficient and the characteristic length was examined for the spandex yarn that doesn't have a circular cross section.<BR>The way to estimate the air drag of spandex yarns in axisymmetric air flow are investigated.Results obtained are as follows.<BR> (1) The air drag coefficient of the spandex yarn shows similar tendency to the effect of the flat plate rather than those of sylindrical curvature appeared in the thin yarn because it has remarkable irregularities in its cross section.<BR> (2) The drag coefficient for the fixed end yarn is the same value as that for flat plate.And the drag coefficient for the free end yarn is twice for that.<BR> (3) It is effective and actually reasonable for the characteristic length of the spandex yarn to use the diameter that is converted from the yarn perimeter length without any consideration to its irregularity.
社団法人日本繊維機械学会の論文