Squeezing Flow of Collagen Solution - Mathematical Model of Shear and Elastic Behavior

摘要

This contribution deals with the problem of the squeezing flow of highly concentrated collagen solution (7%). The sample of collagen is compressed between two parallel disks of the texture analyzer instrument TA-XT2i. The bottom disk is fixed and the upper one is approaching at a constant velocity. During experiment the force acting on the moving plate is measured accurately. Total force - deformation dependence data sets were applied for evaluation of parameters of mathematical model having independent parameters for shear and elongation deformation regimes. Because lubricated Teflon foils are attached to the both plates a partial wall slip on plates is considered in the developed mathematical model assuming prevalence of the elongation flow contribution.