Abstract
This paper concerns a proposal to define a way to evaluate the effectiveness of ER fluids. After recalling the basic parameters of the ER fluids: static yield stress τy, current density j, and zero-field viscosity η0, we determine for a lot of ER suspensions the experimental values of two corresponding parameters E1 = τy / j and E2 = τy / η0, and thereafter of a global effectiveness parameter En = E1E2. We also compare the results obtained in the different cases of micrometer-sized and nanometer-sized particles-based ER fluids.
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