Scaling exponents for energy transport and dissipation in binary vibro-fluidized granular beds
Scaling exponents for energy transport and dissipation in binary vibro-fluidized granular beds
复制标题
二元振动流化颗粒床中能量传输和耗散的标度指数
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
J. M. Huntley
中科院分区：
文献类型：
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作者：
R. Wildman;J. M. Huntley
首次利用正电子发射粒子跟踪技术对二元三维高流态化振动颗粒床进行了研究。计算了各组分的填料分数分布和颗粒温度分布，并确定了其对振动振幅和颗粒数变化的响应。发现二元系统，虽然支持两个单独的颗粒温度分布，响应振动速度的变化大致类似于单尺寸颗粒床。对稳态能量输入/耗散率平衡方程的分析支持了这一评估，该方程包含描述类和异粒之间碰撞耗散的项。然而，该理论也表明，如果一个分数占主导地位，那么两相的颗粒温度和基峰速度之间可能表现出不同的标度关系。
A binary three-dimensional highly fluidized vibrated granular bed has been investigated for the first time using positron emission particle tracking. Packing fraction distributions and granular temperature profiles are calculated for each species and the response to changes in the amplitude of vibration and the number of grains are determined. It is found that the binary system, though supporting two separate granular temperature profiles, responds to changes in vibration velocity in a broadly similar fashion to a monosized granular bed. This assessment is supported by an analysis of the steady-state energy input/dissipation rate balance equation, which contains terms describing the collisional dissipation between like and unlike grains. However, this theory also suggests that if one fraction dominates over another then the two phases could show different scaling relationships between the granular temperature of each phase and the base peak velocity.