Surface wave generation via a gas-jet penetration into a liquid sheet
Surface wave generation via a gas-jet penetration into a liquid sheet
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通过气体射流渗透到液体层中产生表面波
DOI：
10.1016/j.expthermflusci.2018.03.035
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发表时间：
2018-10
影响因子：
3.2
通讯作者：
崔宝玲
中科院分区：
文献类型：
--
作者：
刘琦;林哲;陈小平;朱祖超;崔宝玲
对垂直气液界面垂直射流冲击产生表面波的机理和频率进行了实验研究。用高速摄像机拍摄了气液界面振荡过程中表面波的产生和传播。在能量从壁面射流向表面波传递的背景下，揭示了垂直气液界面的周期性振荡。此外，波的产生被认为是释放最大界面弹性能量的一种手段。定义波形界面腰颈之间的径向距离为振幅，并采用特征振幅来反映动态振动过程中波形界面的周期性变形。此外，特征波长，即腰部和颈部之间的垂直距离，约为液体片厚度的三分之一，而不考虑穿透参数，如气体流速，射流高度和液体片厚度。分析了这些参数对表面波产生频率的影响。结合无量纲参数弗劳德数和射流高度与喷嘴直径的比值被用来归一化表面波产生频率与所有的穿透参数。通过拟合分析发现，频率可以用一个自然的指数函数来表示，其中组合无量纲参数用于归一化。这项工作将有助于在实际工业应用中表征界面运动。
The mechanism and frequency of surface wave generated by normal wall-jet impingement at a vertical gas-liquid interface were experimentally characterized for a gas-jet penetrating into a liquid sheet. The oscillatory gas-liquid interface accompanied by surface wave generation and propagation were captured with a high-speed camera. Periodic oscillations of the vertical gas-liquid interface were revealed in the context of energy transfer from the wall-jet to surface waves. In addition, wave generation was considered as a means of releasing the maximum interfacial elastic energy. The radial distance between the waist and neck of the wavy interface was defined as the amplitude and the characteristic amplitude was adopted to reveal periodic deformation of the wavy interface during dynamic oscillations. Furthermore, the characteristic wavelength, i.e. vertical distance between waist and neck, was about one third of the liquid sheet thickness, irrespective of penetration parameters, such as gas flow rate, jet height, and liquid sheet thickness. The effects of those parameters on the surface wave generation frequency were analyzed. A combined dimensionless parameter of Froude number and the ratio of jet height to nozzle diameter was used to normalize the surface wave generation frequency with all the penetration parameters. It was found that the frequency could be expressed by a natural exponential function with the combined dimensionless parameter for normalization via fitting analysis. This work should be helpful to characterize interfacial motion in actual industrial applications.
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影响因子：
1.2
作者：
M. Sarafraz;S. Peyghambarzadeh;Seyed Ali Alavi Fazel
通讯作者：
M. Sarafraz;S. Peyghambarzadeh;Seyed Ali Alavi Fazel
影响因子：
6.4
作者：
M. Sarafraz;A. Arya;F. Hormozi;V. Nikkhah
通讯作者：
M. Sarafraz;A. Arya;F. Hormozi;V. Nikkhah
影响因子：
3.7
作者：
F. Zonta;A. Soldati;M. Onorato
通讯作者：
F. Zonta;A. Soldati;M. Onorato
影响因子：
3.7
作者：
W. Young;C. Wolfe
通讯作者：
W. Young;C. Wolfe
影响因子：
3.7
作者：
D. Tseluiko;S. Kalliadasis
通讯作者：
D. Tseluiko;S. Kalliadasis