矩形窄缝通道近壁汽泡滑移和浮升可视化实验研究

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基金项目:

国家自然科学基金资助项目(51106142)

Visualized Experimental Study on Sliding and Lift-Off of Bubbles in Narrow Rectangular Channel

1. CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China;
2. National Energy R&D Center of Pressurized Water Reactor Technology, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 采用高速摄像仪从宽面和窄面拍摄、观察矩形窄缝通道内近壁汽泡滑移、浮升运动,发现在加热面倾斜朝上和竖直向下流动沸腾时汽泡易于浮升。汽泡浮升后,其运动速度迅速增加。由于浮升汽泡处于过冷流体中,其界面上发生冷凝,导致汽泡界面形状变化较大。基于可视化实验结果,从受力角度分析不同流动方式和加热面放置方式对近壁汽泡滑移和浮升的影响。
- 滑移汽泡 /
- 浮升 /
- 界面形状 /
- 窄缝
Abstract: The phenomenon on sliding and lift-off of bubbles in a narrow rectangular channel were observed through the top view and side view of the narrow rectangular channel using a high speed digital camera.In inclined upward facing upflow boiling and in vertical downflow boiling,the bubble tends to lift off from the surface.The bubble velocity increases after lift-off from the heating surface,and the condensation phenomenon of lift-off bubble will occur when the bulk flow is subcooling,which results in the change of bubble shape.Base on the experimental results,the effects of different flow mode and heating surface inclined mode on the sliding and lift-off of bubble are analyzed.
- Sliding bubble /
- Interface shape /
- Narrow channel /