摘要
沿倾斜壁面下降的薄液膜表面受气流剪切力的影响产生波动,液膜表面的波动特性和力平衡关系基于液膜表面的力平衡方程和边界条件,建立了在切应力作用下表征沿倾斜壁面下降液膜流动特性的O-S方程。结合切应力作用下液膜的流动状态,分析了表面波扰动在初发时刻的不稳定性,并着重描述引发不稳定性的各种物理原因。研究表明:表面张力和重力的横向分量为稳定性因素,重力的纵向分量为不稳定性因素。切应力对表面波的稳定性作用与气流方向和液膜的流动状态相关。
Waves that occur at the interface of a thin liquid fill draining down an inclined wall sheared by turbulent gas streams will determine the character/stic nature and stability of the flow because of the high degree of gas shear and force balance on the interface. Based on the force balance on the interface and boundary conditions, the 0rrSommerfeld equation is established under the shear stress for a falling liquid fill draining down an inclined wall. The effects of shear stress, Reynolds number, wave number on the fluid film stability are analyzed. The research shows that the shear stress is one of fluid fill dissemination unstable factors. The critical Reynolds number decreases with countercurrent shear stress and increases with cocurrent shear stress. Results show that the shear direction has an important influence of wave number and the other factors on flow stability.
出处
《电力科学与工程》
2007年第1期41-44,共4页
Electric Power Science and Engineering
基金
高等学校博士学科点专向科研基金项目(20040079004)
作者简介
王松岭（1954-），男，华北电力大学电站设备状态监测与控制教育部重点实验室教授，博士生导师
