Wall slippage with siloxane gum and silicon rubbers |
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Institution: | 1. Department of Mining Engineering, Selcuk University, 42075 Konya, Turkey;2. Department of Mining Engineering, Dumlupinar University, 43100 Kutahya, Turkey;1. Loughborough University, Loughborough LE11 3TU, United Kingdom;2. Purdue University,West Lafayette IN 47907–2100, USA |
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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 60 kPa, and there was a jump in the slip velocity at a stress level of about 80 kPa. 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. |
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