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。
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.
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
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
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