%0 Book Section %1 statphys23_0144 %A Reddy, K. Anki %A Kumaran, V. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K bagnold coefficients dense flows granular kinetic micro rheology statphys23 structure theory topic-7 %T Rheology and Microstructure of Dense Granular Flows %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=144 %X A granular material is a collection of discrete,solid paricles dispersed in an interstitial fluid, which is ubiquitous in nature.Apart from exhibiting fascinating properties because of dissipative ineractions ,their importance in geophysics and in various industrial processes,flows of granular materials are the focus of large amount of research involving physicists and engineers.A good understanding of the physics of granular materials is desired in order to design efficient processing and handling systems.Towards a better understanding of rheology of granular flows,we implemented numerical simulations of granular material flow in two different geomtries to investigate the bulk rheology, i) simple shear flow in the absence of gravity using Lees- Edwards boundary conditions with hard sphere collision rules as governing equations, ii) flow down an inclined plane using Discrete Element Method(DEM) that employ a linear spring-dashpot model for particle interactions.Bagnold coefficients, which are the ratios of the different components of the stress and the square of the strain rate, and dissipation rates were estimated and we found a good aggrement between the kinetic theory results and numerical simulation data over a wide range of parameters. We investigated quantitatively on the three dimensional structure by decomposing the pair distribution function into spherical harmonics , by using Voronoi cell volume distribution and Bond Orientational Order Parameter Analysis.

@incollection{statphys23_0144, abstract = {A granular material is a collection of discrete,solid paricles dispersed in an interstitial fluid, which is ubiquitous in nature.Apart from exhibiting fascinating properties because of dissipative ineractions ,their importance in geophysics and in various industrial processes,flows of granular materials are the focus of large amount of research involving physicists and engineers.A good understanding of the physics of granular materials is desired in order to design efficient processing and handling systems.Towards a better understanding of rheology of granular flows,we implemented numerical simulations of granular material flow in two different geomtries to investigate the bulk rheology, i) simple shear flow in the absence of gravity using Lees- Edwards boundary conditions with hard sphere collision rules as governing equations, ii) flow down an inclined plane using Discrete Element Method(DEM) that employ a linear spring-dashpot model for particle interactions.Bagnold coefficients, which are the ratios of the different components of the stress and the square of the strain rate, and dissipation rates were estimated and we found a good aggrement between the kinetic theory results and numerical simulation data over a wide range of parameters. We investigated quantitatively on the three dimensional structure by decomposing the pair distribution function into spherical harmonics , by using Voronoi cell volume distribution and Bond Orientational Order Parameter Analysis.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Reddy, K. Anki and Kumaran, V.}, biburl = {https://www.bibsonomy.org/bibtex/23267d501b4b9271192e8a9263f01a22e/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {439a4b0f02603e8e1e264f31daf8e3c9}, intrahash = {3267d501b4b9271192e8a9263f01a22e}, keywords = {bagnold coefficients dense flows granular kinetic micro rheology statphys23 structure theory topic-7}, month = {9-13 July}, timestamp = {2007-06-20T10:16:12.000+0200}, title = {Rheology and Microstructure of Dense Granular Flows}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=144}, year = 2007 }