水平降膜管外液膜厚度分布

发布时间：2018-04-26 00:39

本文选题：水平管 + 液膜　；参考：《过程工程学报》2017年02期

【摘要】：研究了液膜流动破裂的基础机理,构建了考虑表面张力、重力、惯性力及剪切应力等因素的液膜动力模型,采用边界层积分法,引入含有三次项剪切力项的速度分布函数,推导二维稳态水平管外环向液膜的厚度方程.通过数值方法求解该厚度方程,得到水平管外环向液膜厚度的分布规律.结果表明,随环向角度增大,环向液膜厚度先减小后增大,最薄液膜位置角在环向90?之后,且流量、剪切应力系数与管径等因素不改变环向液膜厚度的分布趋势,改变了环向最薄液膜位置角.最薄液膜位置角随流量增大、剪切应力系数减小及管径减小而增大.表面张力是影响环向液膜稳定性不可忽略的因素.
[Abstract]:The basic mechanism of liquid film flow cracking is studied. The dynamic model of liquid film is constructed, including surface tension, gravity, inertia force and shear stress. The boundary layer integral method is used to derive the velocity distribution function containing three terms of the term shear force, and the thickness equation of the outer annular liquid film is derived. The numerical method is used to solve the equation. The thickness distribution of the outer ring to the liquid film is obtained by the thickness equation. The results show that the thickness of the annular liquid film decreases first and then increases with the increase of the circumferential angle, and the position angle of the thinnest liquid film is 90? After the ring direction, and the flow, the shear stress coefficient and the diameter of the tube do not change the distribution trend of the thickness of the ring to the liquid film, and change the position of the thinnest liquid film. The angle. The position angle of the thinnest liquid film increases with the flow rate, the shear stress coefficient decreases and the pipe diameter decreases, and the surface tension is an important factor affecting the stability of the annular liquid film.

【作者单位】：福州大学石油化工学院;
【分类号】：TQ021.1

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