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Experimental and Numerical Investigations of the Shear Behavior of Binary Particle Blends
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  • Jiecheng Yang,
  • Poom Bunchatheeravate,
  • Subhash Thakur,
  • Joseph Bullard,
  • Jennifer Sinclair Curtis
Jiecheng Yang
University of California Davis
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Poom Bunchatheeravate
Vertex Pharmaceuticals Incorporated
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Subhash Thakur
Vertex Pharmaceuticals Incorporated
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Joseph Bullard
Vertex Pharmaceuticals Incorporated
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Jennifer Sinclair Curtis
Universtity of California, Davis
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Peer review status:UNDER REVIEW

07 May 2020Submitted to AIChE Journal
07 May 2020Assigned to Editor
07 May 2020Submission Checks Completed
15 Jun 2020Reviewer(s) Assigned

Abstract

In this study, a Schulze Ring Shear Tester and the Discrete Element Method (DEM) are employed to investigate the effect of polydispersity on the binary shear flows. Both experimental results and DEM simulations show that the pre-shear stresses are greater for binary blends than for monodispersed particles. The flowability of these mixtures is strongly affected by the solid fraction, with minimal flow function values correlating to maximum packing fraction. However, minimum flow function values are not observed at the same packing fractions where the maximum pre-shear stress occurs. The powder friction has a slightly higher contribution to powder strength than powder adhesion, and the frictional component follows the same trend as shear stress with mixture composition. Using DEM, it is demonstrated that the addition of small adhesive particles reduces the averaged angular velocity of the larger particles, which makes a contribution to the larger shear stress for binary blends.