排序方式: 共有49条查询结果,搜索用时 15 毫秒
21.
22.
23.
DRAG FORCE IN DENSE GAS—PARTICLE TWO—PHASE FLOW 总被引:1,自引:0,他引:1
Numerical simulations of flow over a stationary particle in a dense gas-particle two-phase flow have been carried out for
small Reynolds numbers (less than 100). In order to study the influence of the particles interaction on the drag force, three
particle arrangements have been tested: a single particle, two particles placed in the flow direction and many particles located
regularly in the flow field. The Navier-Stokes equations are discretized in the three-dimensional space using finite volume
method. For the first and second cases, the numerical results agree reasonably well with the data in literature. For the third
case, i.e., the multiparticle case, the influence of the particle volume fraction and Reynolds numbers on the drag force has
been investigated. The results show that the computational values of the drag ratio agree approximately with the published
results at higher Reynolds numbers (from 34.2 to 68.4), but there is a large difference between them at small Reynolds numbers.
The project supported by the Special Funds for Major State Basis Research Projects in China (G19990222). 相似文献
24.
Basset力研究进展与应用分析 总被引:5,自引:0,他引:5
Basset力为两相流中颗粒与流体存在相对加速度时所产生的一种非恒定气动力 ,以往对其进行了大量的实验研究、理论分析和数值模拟。本文通过对Basset力研究文献的综述 ,分析并归纳了各种不同两相流动问题中该力的影响情况 ,得到的结论是 :对于气泡在液体内的流动问题 ,当气泡运动的脉动频率很大或很小时可以忽略Basset力对其运动的影响 ;对于固体或液体颗粒在气体中的运动问题可以忽略Basset力的影响 ;而其它两相流动问题则需要根据具体问题的特点来决定是否考虑Basset力的影响 ,其中需要考察 :流体与颗粒密度差别 ,颗粒尺寸 ,流动特征时间和颗粒运动弛豫时间 ,相对加速度 (或减速度 )等因素。本文还探讨了Basset力研究的发展方向。 相似文献
25.
26.
27.
28.
29.
30.