7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

An investigation of granular rheology using Positron Emission Particle Tracking

9 Jul 2014, 11:30
D Les 103

D Les 103

Oral Presentation Track F - Applied Physics Applied


Mr Thirunavukkarasu Pathmathas (University of Cape Town)

Main supervisor (name and email)<br>and his / her institution

Dr.Indresan Govender, indresan.govender@uct.ac.za,
University of Cape Town

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

We consider the rheological drivers of granular flows comprising mono-sized (5 mm) glass beads in a 300 mm diameter rotating drum operated in the cascading-to-cataracting Froude regime. By combining the inherent frictional nature of particles within a dense flow regime and noting that industrial rotating drums (tumbling mills) are typically characterised by collisional and turbulent stresses, a theoretical expression of the effective friction coefficient is derived, yielding a customised granular rheology for athermal, free surface granular flows. The input data to the model (velocity, solids concentration, pressure and flow depth) are obtained directly from non-invasive measurement using a nuclear imaging technique: Positron Emission Particle Tracking (PEPT). Using the new rheology, we derive the in-situ power dissipation and show that shear stresses drive the energy dissipation in the tumbling mill.

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Primary author

Dr Indresan Govender (University of Cape Town)


Dr Maximilian Richter (University of Cape Town) Mr Thirunavukkarasu Pathmathas (University of Cape Town)

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