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首页> 外文会议>6th International Conference on Bulk Materials Storage, Handling and Transportation, Sep 28-30, 1998, University of Wollongong NSW >The Influence of Material Properties on Conveying Characteristics
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The Influence of Material Properties on Conveying Characteristics

机译：材料性能对输送特性的影响

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摘要

Relationships between flow modes and material properties are considered for pneumatic conveying systems. It is suggested that two-phase gas-solid flows are possible only for three quite distinct modes of flow. The fundamental mechanisms controlling each flow mode are very different and attempts to develop an 'universal theory' will not be successful. The three flow modes are (ⅰ) dense phase slugging mode, (ⅱ) dense phase moving bed mode, and (ⅲ) lean phase mode. Materials, which can be conveyed in a dense phase mode, can also be conveyed lean phase. A pneumatic flow parameter, N_c =ρ_sk/t_(da) is introduced to indicate if a product is a good candidate to be conveyed in either of the two dense phase modes or only in a lean phase mode. Minimum pick-up velocities are scaled by important non-dimensional 'π' groups to determine relationships between phase density and a non-dimensional critical velocity for several materials. For lean phase flows the non-dimensional minimum velocity is constant and independent of phase density. For a dense phase moving bed flow the minimum velocity is a function of phase density and a correlation is proposed. For a material that can be conveyed in a dense phase slugging mode the non-dimensional critical velocities appear constant. The critical velocity that defines the maximum for stable slugging flow is the same as the minimum for material that can only be conveyed in a lean phase mode.
机译：对于气动输送系统，应考虑流动模式与材料特性之间的关系。建议仅在三种截然不同的流动模式下才可能进行两相气固流动。控制每种流动模式的基本机制非常不同，尝试建立“通用理论”的尝试将不会成功。三种流动模式是（ⅰ）浓相段流模式，（ⅱ）浓相移动床模式和（ⅲ）稀相模式。可以以密相模式传送的材料也可以以稀相传送。引入气动参数N_c =ρ_sk/ t_（da）来指示产品是否是在两种密相模式中或仅在稀相模式中传输的良好候选者。最小拾取速度由重要的无量纲“π”组缩放，以确定几种材料的相密度与无量纲临界速度之间的关系。对于稀相流，无量纲最小速度是恒定的，并且与相密度无关。对于密相移动床流，最小速度是相密度的函数，并提出了相关性。对于可以以密相段塞模式输送的材料，无量纲的临界速度显得恒定。临界速度决定了稳定的团状流的最大值，该临界速度与只能以稀相模式输送的物料的最小值相同。

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