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Response of shear stress to ac electric fields under steady shear flow in a droplet-dispersed phase
Yang Ho Na1, Kohei Aida, Ryosuke Sakai
1Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
Abstract:
We have measured the response of shear stress to ac electric fields under steady shear flow in the droplet-dispersed phase of an immiscible polymer blend. A characteristic mode was found under steady shear flow, the relaxation frequency of which increased with increasing the shear rate. In the frequency dispersion, a scaling relation derived from dimensional analysis was confirmed to hold. The origin of the mode was investigated on the basis of the Maffettone-Minale (MM) model, in which the droplet shape is described by a second-rank tensor. The frequency dispersion of the response was also calculated using a modified MM model.
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