A Study of Viscoelastic Fluid Flow : 1st Report, Correction of Tube Length and Others

Bagley and others showed that the additional loss at the entry of a capillary tube, through which a viscoelastic fluid flows, was a strong function of the apparent shear rate. However, no one has ever attempted to treat analytically the entrance additional loss, as far as the author's knowledge is concerned. In this paper, assuming that the elastic energy is stored in the flowing fluid, this problem is approximately analysed. Then, the extrudate swelling (Barus'effect) and the extrudate irregularities are qualitatively explained. Moreover, the drag of a sphere placed in the viscoelastic fluid flow is calculated roughly.