Nonsteady flow of a viscoelastic liquid which obeys the DeWitt rheological equation in the capillary of a spinneret for spinning man-made fibres has been studied.
It has been found that the flow regimes for a polymeric liquid with constant pressure drop and with constant flow rate differ sharply in their character. In the first case, the flow rate of liquid fluctuates with time from plus to minus values; in the second, the pressure drop in the liquid increases monotonically. A fluctuating process for the profiles of lengthwise liquid velocities unifies the two cases of flow.
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Pervadchuk, V.P., Krainov, V.K. & Yankov, V.I. Isometric nonsteady flow of a viscoelastic liquid in a spinneret capillary. Fibre Chem 19, 330–333 (1988). https://doi.org/10.1007/BF00551559
- Pressure Drop
- Constant Pressure
- Constant Flow
- Nonsteady Flow