On the cooling law of a non-dilute granular gas
The cooling law of a granular gas was investigated using a three-dimensional MD simulation code, which allowed us to include both inelasticity and frictional effects of the particle contacts. It was found that the kinetic energy decays in time as E(t) - t-n; the exponent n of the cooling law changes...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57021690001 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57021690001 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas cooling Haff's law Granular gas |
| Sumario: | The cooling law of a granular gas was investigated using a three-dimensional MD simulation code, which allowed us to include both inelasticity and frictional effects of the particle contacts. It was found that the kinetic energy decays in time as E(t) - t-n; the exponent n of the cooling law changes significantly with the solid fraction, ®, and the coefficient of restitution, E. For dilute gases, for times greater than tc, we found that n ¼ 1, in agreement with the results reported by Nie et al. [10]. As a and/or E increase, the cooling coefficient increases to an asymptotic value of n ¼ 2:2, which is slightly higher than the prediction made by Haff [3]. We interpret this increase in the cooling exponent as a possible re-homogenization of the granular state. |
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