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垂直并流向上气固两相流中流动结构的分析及曳力系数的计算

杨宁; 王维; 葛蔚; 李静海   

  1. Multi-Phase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of
    Sciences, Beijing 100080,China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2003-02-28 发布日期:2003-02-28
  • 通讯作者: 杨宁

Analysis of Flow Structure and Calculation of Drag Coefficient for Concurrent-up Gas-Solid
Flow

YANG Ning; WANGWei; GEWei; LI Jinghai   

  1. Multi-Phase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of
    Sciences, Beijing 100080,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-02-28 Published:2003-02-28
  • Contact: YANG Ning

摘要: This study investigates the heterogeneous structure and its influence on drag coefficient
for concurrent-up gas-solid flow. The energy-minimization multi-scale (EMMS) model is
modified to simulate the variation ofstructure parameters with solids concentration,
showing the tendency for particles to aggregate to form clusters andfor fluid to pass
around clusters. The global drag coefficient is resolved into that for the dense phase, for
the dilutephase and for the so-called inter-phase, all of which can be obtained from their
respective phase-specific structureparameters. The computational results show that the drag
coefficients of the different phases are quite different,and the global drag coefficient
calculated from the EMMS approach is much lower than that from the correlationof Wen and
Yu. The simulation results demonstrate that the EMMS approach can well describe the
heterogeneousflow structure, and is very promising for incorporation into the two-fluid
model or the discrete particle model as theclosure law for drag coefficient.

关键词: drag coefficient;two-phase flow;multi-scale;flow structure;two-fluid model

Abstract: This study investigates the heterogeneous structure and its influence on drag coefficient
for concurrent-up gas-solid flow. The energy-minimization multi-scale (EMMS) model is
modified to simulate the variation ofstructure parameters with solids concentration,
showing the tendency for particles to aggregate to form clusters andfor fluid to pass
around clusters. The global drag coefficient is resolved into that for the dense phase, for
the dilutephase and for the so-called inter-phase, all of which can be obtained from their
respective phase-specific structureparameters. The computational results show that the drag
coefficients of the different phases are quite different,and the global drag coefficient
calculated from the EMMS approach is much lower than that from the correlationof Wen and
Yu. The simulation results demonstrate that the EMMS approach can well describe the
heterogeneousflow structure, and is very promising for incorporation into the two-fluid
model or the discrete particle model as theclosure law for drag coefficient.

Key words: drag coefficient, two-phase flow, multi-scale, flow structure, two-fluid model