Clustering instabilities, arching and anomalous interaction probabilities as examples for cooperative phenomena in dry granular media

• Autorzy: Luding S.
• Języki publikacji: EN

Abstrakty

EN

In a freely cooling granular material fluctuations in density and temperature cause position dependent energy loss. Due to strong local dissipation, pressure and energy drop rapidly and material moves from "hot" to "cold" regions, leading to even stronger dissipation and thus causing the density instability. The assumption of "molecular chaos" is valid only in the homogeneous cooling regime. As soon as the density instability occurs, the impact parameter is no longer uniformly distributed. The pair-correlation and the structure functions show that the molecular chaos assumption-together with reasonable excluded volume modeling-is important for short distances and irrelevant on large length scales. In this study, the probability distribution of the collision frequency is examined for pipe flow and for freely cooling granular materials as well. Uncorrelated events lead to a Poisson distribution for the collision frequencies. In contrast, the fingerprint of the cooperative phenomena discussed is a power-law decay of the probability for many collisions per unit time.

Słowa kluczowe

EN

clustering instabilities; arching; anomalous interaction probabilities; cooperative phenomena; dry granular media; freely cooling granular material

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 1998
• Tom: Vol. 2, No 3
• Strony: 417--442
• Opis fizyczny: Bibliogr. 83 poz., rys.

Twórcy

autor

Luding S.

• Instotute for Computer Applications, Pfaffenwaldring 27, D-70569 Stuttgart, Germany

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