Abstract
Fast squeezing flows of viscoelastic fluids between two parallel circular disks are analyzed with a generalized version of the Bird—Dotson—Johnson equation, which has been derived from a molecular theory and has been shown to predict many rheological properties reasonably well. By taking into account the tremendous macromolecular stretching in a early stage of squeezing, the analysis can predict approximately (i) the time required to squeeze out half of the liquid in a constant-force squeezing experiment, and (ii) the load capacity in a constant-speed squeezing experiment. These analytical results, which are considerably different from those for the power-law fluid squeezing, are in good agreement with the epxerimental data for the fast squeezing in several viscoelastic fluids.
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