滑脱
打滑(空气动力学)
流变仪
流变学
聚二甲基硅氧烷
材料科学
复合材料
硅氧烷
硅
机械
天然橡胶
剪应力
毛细管作用
热力学
聚合物
物理
冶金
作者
Brian Crawford,J. G. Watterson,P.L. Spedding,Srinivasan Raghunathan,W. Herron,M. R. E. Proctor
标识
DOI:10.1016/j.jnnfm.2005.05.004
摘要
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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