Conoscopic observation of director reorientation during Poiseuille flow of a nematic liquid crystal

Holmes, C. J.; Cornford, S. L.; Sambles, J. R.
October 2009
Applied Physics Letters;10/26/2009, Vol. 95 Issue 17, p171114
Academic Journal
Director reorientation under pressure driven (Poiseuille) flow is observed conoscopically for the liquid crystal 5CB aligned at an azimuthal angle of 45° to the direction of flow. A polyimide surface treatment (AL 1254) is used to promote planar homogeneous alignment and rubbed to produce an initial azimuthal alignment angle [lowercase_phi_synonym]0. Conoscopic interference figure rotation is documented as a function of flow rate and compared to that produced from numerical models using Leslie–Ericksen–Parodi theory. Model and data show excellent agreement.


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