Theodoros Nestor Papapetrou , Martina Bieberle , Frank Barthel , Uwe Hampel , Gregory Lecrivain
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引用次数: 0
摘要
实验研究了在一个半满的旋转滚筒中初始分离的二元颗粒系统的瞬态混合动力学。颗粒系统由大小相同的球形珠子组成。两相颗粒的密度比为 2.8。超快 X 射线计算机断层扫描能够高频扫描三维不透明系统,因此可用于捕捉块体中的瞬态和稳态偏析动态。同时还将偏析动力学与用照相机捕捉到的圆形端壁帽的偏析动力学进行了比较。研究结果表明,密度较大的颗粒会向块体进行轴向迁移,更重要的是,径向混合指数会出现二阶超调动态,并随着弗劳德数的增加而增加。这些结果将应用于发生快速混合的工业系统。我们还认为,所提供的数据可以作为未来三维模拟的验证,重点研究块体中偏析模式的瞬时形成。
Investigating binary granular mixing in a rotating drum using ultrafast X-ray computed tomography
The transient mixing dynamics of an initially segregated binary granular system in a half-filled rotating drum are experimentally investigated. The granular system consists of spherical beads having identical size. The density ratio between the two granular phases is 2.8. With its ability to scan three-dimensional opaque systems with a high frequency, the ultrafast X-ray computed tomography is used to capture the transient and steady-state segregation dynamics in the bulk. The segregation dynamics are also compared to those at the circular end-wall caps, which have been captured with a camera. The results show an axial migration of the denser particles towards the bulk and, more importantly, second-order overshooting dynamics in the radial mixing index, which tend to increase with the Froude number. The results will find application in industrial systems, where rapid mixing occurs. We also believe the presented data can serve as validation for future three-dimensional simulations focusing on the transient formation of segregation patterns in the bulk.
期刊介绍:
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.