Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10392993 | Journal of Non-Newtonian Fluid Mechanics | 2005 | 8 Pages |
Abstract
A slip analysis has been developed to calculate the slip velocities from the capillary rheometry data for a polydimethylsiloxane (PDMS) gum, and two silicon rubber compounds. The analysis generalises the classical Mooney method [J. Rheol. 2 (1931) 210-222] to incorporate the influence of die geometry on the slip behaviour. For the PDMS gum, no slippage was observed below a stress level of about 60âkPa, and there was a jump in the slip velocity at a stress level of about 80âkPa. The complex rheological behaviour of the rubbers meant that the analysis was only applicable at higher stress levels. For each material, a reasonable fit to the slip velocity was obtained using a generalised Navier slip law, which can easily be implemented into computational fluid dynamic simulations. Ultimately, a more realistic slip law is required to model the observed flow behaviour correctly.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
B. Crawford, J.K. Watterson, P.L. Spedding, S. Raghunathan, W. Herron, M. Proctor,