当前位置: X-MOL 学术Int. J. Therm. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Experimental study of entrainment vortex characteristic at steam-water interface of a water-submerged steam jet
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2021-07-02 , DOI: 10.1016/j.ijthermalsci.2021.107136
Pengfei Fu 1 , Quanbin Zhao 2 , Jiping Liu 1 , Daotong Chong 2 , Junjie Yan 2
Affiliation  

Interfacial fluctuation and turbulent entrainment in the vapour-liquid mixing layer have great influence on heat and mass transfer in direct contact condensation. In this study, an ingenious experimental design was adopted to explore the characteristic microstructure at the steam-water interface of a water-submerged steam jet. Firstly, the periodic evolution process of large-scale two-phase coherent entrainment vortexes in the upper and lower steam-water turbulent mixing layers was captured. This process was divided into four stages: vortex formation, vortex growth, vortex pairing and vortex shedding. At the vortex growth stage, the central axial displacement of vortex was approximately linear with time, whereas the variation of vortex scale was nonlinear with time. Secondly, the periodic fluctuation of jet penetration length was caused by the pairing and shedding of periodic vortexes. Finally, the vortex formation process and distribution law of mixing layer thickness were analysed. The average scale of vortex blob at the pairing position was predicted and showed good agreement with the experimental data.



中文翻译:

浸水蒸汽射流汽水界面夹带涡特性的实验研究

汽液混合层中的界面波动和湍流夹带对直接接触冷凝中的传热传质有很大影响。在这项研究中,采用巧妙的实验设计来探索浸水蒸汽射流的汽水界面处的特征微观结构。首先,捕捉了上下汽水湍流混合层中大尺度两相相干夹带涡的周期性演化过程。这个过程分为四个阶段:涡流形成、涡流生长、涡流配对和涡流脱落。在涡流成长阶段,涡流中心轴位移随时间近似线性变化,而涡流尺度随时间变化呈非线性变化。第二,射流穿透长度的周期性波动是由周期性涡旋的配对和脱落引起的。最后,对涡旋形成过程及混合层厚度分布规律进行了分析。对配对位置的涡团平均尺度进行了预测,与实验数据吻合良好。

更新日期:2021-07-04
down
wechat
bug