## Tribology and Lubrication Technology October 2012 : Page 28Student POSteR AbStRAct Experimental Investigations on the Coefficient of Friction and Wear of Single Granules Martin C. Marinack Jr., Patrick S. M. Dougherty and C. Fred Higgs III (Advisor) Mechanical Engineering Department Carnegie Mellon University Pittsburgh, Pa. Note: For a closer look at Martin’s poster abstract, be sure to check out his short video presentation in the October digital version of TLT (available at www.stle.org) INTRODUCTION Granular flows are prevalent in both nature and industrial sec-tors where their nonlinear and multiphase behavior makes them difficult to understand and predict. They are of particular importance in the bulk solids processing industry, 1 where gran-ular flow phenomena can adversely affect product effective-ness, yield, and cost. Thus, the accurate prediction of particle flow inside of common solids processing equipment (e.g., hop-pers, silos, mixers, etc.) becomes important in being able to design against negative effects. Discrete modeling approaches are often used for the predic-tion and study of particle flows inside the geometries men-tioned. Principal among these approaches is the discrete ele-ment method (DEM), which provides for a rigorous physical treatment of particle interactions. The accuracy and effective-ness of these discrete models will depend on the modeling of individual particle interactions, which in turn relies on the ac-curacy of the interaction parameters being used. Prior discrete particle modeling studies 2-4 have shown that even small differ-ences in particle properties and interaction parameters such as particle shape, coefficient of restitution (COR), and coefficient of friction (COF) can have large effects on the global flow be-havior being predicted by the model. These studies serve to highlight the importance of experimentally obtaining detailed and accurate particle properties and particle interaction proper-ties, such as particle roughness and morphology, particle-parti-cle and particle-boundary COR and COF , and particle attrition and wear rates, for use as input in discrete particle simulations. The authors have already performed extensive work on the study of COR. 5 Unlike Rademacher 6 who studied COF between a surface and a granular mass, the experimental work per-formed here aims to study the COF , and in situ wear during sliding of an individual granule against a rotating disk. Specific consideration is given to the manner in which these parameters may change over time or with certain conditions such as sliding Martin C. Marinack, Jr., is a doctoral student in the Particle Flow and Tri-bology Laboratory at Carnegie Mellon University in Pittsburgh, Pa., where he works under the guidance of professor C. Fred Higgs, III. Martin received both his bachelor’s of science and master’s of science degrees in mechanical engi-neering from Carnegie Mellon in 2008 and 2010, respectively. A National Sci-ence Foundation Graduate Research Fellow, Martin’s research interests in-clude the study of granular flows from a tribological and classical perspec-tive, which has applications to the sol-ids processing, space, and fossil-fuel energy industries. You can reach him at mmarinac@andrew.cmu.edu. 28 STLE is offering CLS, OMA (I&II) and CMFS certification exams Oct. 12 and ## Student Poster Abstract## Martin C. Marinack Jr., Patrick S. M. Dougherty, C. Fred Higgs IIIINTRODUCTION Read the full article at http://onlinedigitalpublishing.com/article/Student+Poster+Abstract/1189328/127715/article.html. Publication List |