层析PIV研究约束喷射冲击沸腾过程中的蒸汽诱导流动结构

2017/12/11   下载量： 3 次

方案摘要

方案下载
应用领域 其他
检测样本 其他
检测项目
参考标准 暂无

采用LaVision公司独特的层析PIV测试技术对约束喷射冲击沸腾过程中的蒸汽诱导流动结构进行了研究。

方案下载
配置单
方案详情

Tomographic particle image velocimetry (PIV) is used to study the effect of confinement gap height
on the liquid flow characteristics in jet impingement boiling. This first application of tomographic PIV to
flow boiling is significant given the complexity of confined two-phase jet impingement. A jet of
subcooled water at a Reynolds number of 5,000 impinges onto a circular heat source undergoing boiling
heat transfer at a constant heat input. Confinement gap heights of 8, 4, and 2 jet diameters are
investigated. A visual hull method is used to reconstruct the time-varying regions of the vapor in the
flow. The vapor motion is found to govern the liquid flow pattern and turbulence generation in the
confinement gap. Time-averaged velocities and regions of turbulent kinetic energy in the liquid are
highest for a confinement gap height of 8 jet diameters, with lower velocity magnitude and turbulence
being observed for the smaller spacings. Coherent vortical structures identified with the λ2-criterion are
found to occur most frequently near the moving vapor interface. The most intense regions of turbulent
kinetic energy do not coincide with the location of coherent structures within the flow. Irrotational
velocity fluctuations in the liquid phase caused by vapor bubble pinch-off are the primary cause of the
high turbulent kinetic energy measured in these regions. At a gap height of H/d = 2 the vapor plume is
constrained as it grows from the heat source, causing bulk flow oscillations in the downstream region of
the confinement gap.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 立方米量级高分辨3D流场测量

文献贡献者

北京欧兰科技发展有限公司
金牌会员 丨 第17年
查看全部资料
相关仪器 更多
相关方案
更多

相关产品

当前位置： 欧兰科技 方案 层析PIV研究约束喷射冲击沸腾过程中的蒸汽诱导流动结构

关注

拨打电话

留言咨询