Abstract
The effect of yarn cross section on the air drag coefficient and the characteristic length is examined for spandex yarn with non-circular cross section.Methods for estimating the air drag of spandex yarns in axisymmetric air flow are investigated. Results obtained are as follows:1) Although the drag coefficient for thin yarns is similar to that of a cylinder, the air drag coefficient of spandex yarn shows similarity to that of a flat plate because of remarkable irregularities in its cross section.2) The drag coefficient for a fixed- end yarn is the same as that for a flat plate. The drag coefficient for a free- end yarn is twice that of the fixed- end yarn. This value is useful in calculating yarn air drag.3) It is efficient and reasonable to use the effective diameter converted from the yarn perimeter length-without any consideration to its irregularity-as the characteristic length of the spandex yarn.
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