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	准静态颗粒流流动规律的热力学分析
	刘中淼 ; 孙其诚 ; 宋世雄 ; 史庆藩 ; Liu Zhong-Miao ; Sun Qi-Cheng ; Song Shi-Xiong ; Shi Qing-Fan
	2016-03-30 ; 2016-03-30
关键词	颗粒流 颗粒温度 非平衡热力学 能量耗散 granular flows granular temperature non-equilibrium thermodynamics dissipation of energy O347.7
其他题名	Non-equilibrium thermodynamic analysis of quasi-static granular flows
中文摘要	本文分析了颗粒流的介观结构及其特征,提出了颗粒流的双颗粒温度概念Tkin和Tconf,表征颗粒无序运动和构型无序演化的程度;进而作为非平衡变量,与经典非平衡热力学(classical irreversible thermodynamics,CIT)变量共同构成颗粒流的热力学状态变量集,确定了颗粒流的能量转换规律和熵产生率等,发展了颗粒流双颗粒温度(two granular temperate,TGT)模型.以体积恒定的简单剪切准静态颗粒流为例,结合离散元模拟(discrete element method,DEM),确定了双颗粒温度模型所需的材料参数,分析了颗粒流发展段的规律和稳恒段的有效摩擦系数.; Granular flow is usually divided into three kinds of flow pattern, namely quasi static flow, slow flow, and rapid flow. The core issue of the research is the constitutive relation. A series of constitutive relations of application value have been received up to now, however, the study on principal theory is insufficient. Granular flow has an emergent mesoscopic structure, such as force chain network and vortex, involving complex irreversible processes. This paper studies its mesoscopic structure and principal characters, introduces the concept of two granular temperatures Tconfand Tkinof the granular flow to characterize the degree of chaotic motion and disordered configuration evolution, sets them as the non-equilibrium variables to constitute the thermodynamic state variables set for granular flow with the classical irreversible thermodynamic(CIT) variables, also determines the granular flow law of energy conversion and the entropy production rate, etc., and develops the two granular temperatures(TGT) model. Taking the simple shear quasi-static granular flow in a constant volume as example, and combining it with the discrete element method(DEM), this work confirms the material parameters needed for the TGT model, and analyzes the law of developing period and the effective coefficient of friction of steady period of granular flow.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/148662]
专题	清华大学
推荐引用方式 GB/T 7714	刘中淼,孙其诚,宋世雄,等. 准静态颗粒流流动规律的热力学分析[J],2016, 2016.
APA	刘中淼.,孙其诚.,宋世雄.,史庆藩.,Liu Zhong-Miao.,...&Shi Qing-Fan.(2016).准静态颗粒流流动规律的热力学分析..
MLA	刘中淼,et al."准静态颗粒流流动规律的热力学分析".(2016).

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