Abstract
The shear banding in Large Amplitude Oscillatory Shear flow, LAOS, of the wormlike micellar solution is examined. The shear banding is visualized by the crossed Nicol observation system that is built in a remote. A concentric cylinder flow cell is used to apply the LAOS flow and birefringence distribution in the whole area of the flow cell can be observed by 60fps. At the small strain amplitude, the birefringence appears monotonically. The shear banding is generated in the larger strain range in the first period when the maximum strain amplitude exceeds 1 at frequency 1 Hz. but it does not appear when the shear stress achieves on the periodic state. Increasing strain amplitude or frequency, the shear banding keeps in whole phase. Therefore, it is found that the non-linear behavior of the wormlike micellar solution in LAOS is affected the shear banding strongly.
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