Comparative study of the two-fluid momentum equations for multi-dimensional bubbly flows: Modification of Reynolds stress

被引:5
|
作者
Lee, Seung Jun [1 ]
Jae, Byoung [2 ]
Park, Ik Kyu [1 ]
Yoon, Han Young [1 ]
机构
[1] Korea Atom Energy Res Inst, Thermal Hydraul Safety Res Div, 111 Daedeok Daero, Daejeon 34057, South Korea
[2] Chungnam Natl Univ, Sch Mech Engn, 99 Daehak Ro, Daejeon 34134, South Korea
关键词
Multi-phase flow; CFD; Two-fluid model; 2-PHASE FLOW; WALL DRAG; CODE; TURBULENCE;
D O I
10.1007/s12206-016-1223-1
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Two-fluid equations are widely used to obtain averaged behaviors of two-phase flows. This study addresses a problem that may arise when the two-fluid equations are used for multi-dimensional bubbly flows. If steady drag is the only accounted force for the interfacial momentum transfer, the disperse-phase velocity would be the same as the continuous-phase velocity when the flow is fully developed without gravity. However, existing momentum equations may show unphysical results in estimating the relative velocity of the dispersephase against the continuous-phase. First, we examine two types of existing momentum equations. One is the standard two-fluid momentum equation in which the disperse-phase is treated as a continuum. The other is the averaged momentum equation derived from a solid/ fluid particle motion. We show that the existing equations are not proper for multi-dimensional bubbly flows. To resolve the problem mentioned above, we modify the form of the Reynolds stress terms in the averaged momentum equation based on the solid/fluid particle motion. The proposed equation shows physically correct results for both multi-dimensional laminar and turbulent flows.
引用
收藏
页码:207 / 214
页数:8
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