使用双色激光诱导荧光，红外测温和粒子图像测速仪测量水池池沸腾过程的温度和速度场

2019/07/26   下载量： 1 次

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应用领域 能源/新能源
检测样本 其他
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参考标准 暂无

采用LaVision公司DaVis8.4图像采集和分析软件平台，可编程时间控制器PTU和高速相机，红外相机，构成一套可以用双色法，红外法测温，以及粒子图像测速系统，测量了水池沸腾过程的温度和速度场。

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      We study nucleate pool boiling in water at saturation temperature and ambient pressure under low heat fluxes. A combination of high-speed and spatially-resolved diagnostic tools are developed and applied to provide detailed insight into the flow and heat transfer mechanisms during bubble life cycle. Two fluorescent dyes with non-overlapping spectra are seeded into the water and are excited by a Nd:YLF laser sheet at 527 nm. A two-colour laser-induced fluorescence method is employed to individually track the fluorescence of each dye by connecting two cameras, equipped with separate optical filters, to a beamsplitter and a lens. Tracer particles are also introduced in the water to perform simultaneous particle image velocimetry measurements. Finally, synchronised high-speed infrared thermometry is conducted to acquire the surface temperature field over the heater. The links between the interfacial/bubble dynamics, flow and heat transfer are investigated. Superheated liquid
from the thermal boundary layer adjacent to the heater is displaced upwards, due to the growth and departure of the bubbles. Two counteracting vortices form on each side of the bubbles during their departure and rise, which contribute to the scavenging and mixing of the bulk water, resulting in a trail of superheated liquid below them.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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