| 薛社生,徐明,束小建.横向气流穿过垂直下落液滴场的二维流动数值计算[J].计算力学学报,2011,28(1):102~107 |
|
| 
码上扫一扫！ |
| 横向气流穿过垂直下落液滴场的二维流动数值计算 |
| 2D numerical computation of transverse gaseous flow into a falling drop-field |
| 投稿时间：2009-05-26 修订日期：2010-03-18 |
| DOI：10.7511/jslx201101019 |
| 中文关键词: 气体/液滴两相流动 化学反应 SIMPLE方法 |
| 英文关键词:gas/drop two-phase flows chemical reaction SIMPLE scheme |
| 基金项目:中国工程物理研究院发展基金(2007B09007)资助项目. |
|
| 摘要点击次数: 3496 |
| 全文下载次数: 2010 |
| 中文摘要: |
| 对Cl2/He混合气体横向穿过垂直下落的BHP(按重量25%的KOH,25%的H2O2及50%的H2O)液滴场的化学反应流动作了数值计算。模拟的流场是气体/液滴两相流场,在气相方程中,考虑了液滴与Cl2反应产生及释放O2(1Δ)的质量源项及表示液滴对气流阻碍作用的动量源项。由于气相动量小,液滴在下落过程横向偏移小,下落速度基本不变,因而假定流场中液滴数密度保持均匀。质量源项通过层流边界层理论而得到一种解析表达,反映了液滴表面因反应产生的Cl2通量依赖于来流中Cl2浓度、气流密度及来流速度变化的关系。用SIMPLE方法对气相模型方程作了数值求解。模拟结果显示,气相速度场中靠近顶端和液滴区右边界位置出现涡旋,二维效应较为明显;混合气体的密度经过液滴区有较大下降;Cl2利用率、O2(1Δ)产率随入流速度增大而减小,随液滴速度增大而增大,这些结果与相关文献提供的实验测试结果对比较好。 |
| 英文摘要: |
| Numerical computation of Cl2/He gases flow transverse traveling into falling BHP ( basic hydrogen peroxide)drops field with chemical reaction was carried out. Modeled flow was a gas/drop two-phase flow, and gas-phase equation was established in which both of the mass source term, describing drops/chlorine reaction and the generation and release of singlet oxygen, and the momentum source term, describing the drag on gas flow from liquid drops, was considered.Because the gaseous momentum was small, the transverse offset of a falling liquid drop was less and its velocity was basically invariable,therefore an assumption could be made that the number density of droplets in the fluid field was uniform.An analysis formula of gaseous mass source term was obtained based on laminar boundary layer theory. This formula indicated the relation between the chlorine flux cross the surface of a liquid drop and the concentration of chlorine in hybrid gases, and the velocity of inflow gases. To solve the gaseous model equations, the SIMPLE scheme was used. Modeled results showed that, a vortex generated on the site near the top and the right boundary of the drop-filled region.The density of hybrid gases decreased in drop-filled region, and the chlorine utility, the singlet oxygen decreased with increasment of inflow velocity. These results agreed well with the experimental tests provided in relevant reference. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
