CAJ | 학술논문

以边界层理论为基础，基于独立假设建立了波形板通道内降液膜在横向气流驱动下沿屈折角横向偏移的二维边界层模型。通过量纲分析和理想层流假设进行模型简化及边界层方程求解，建立了横向切应力驱动下波形板壁降膜破裂的力平衡模型并给出破膜速度的临界准则，模型包括波形板通道几何参数、气液两相物性及流动参数等多种因素的影响，与本文实验结果和已有理论模型进行对比，所建模型能够更准确地预测液膜发生破裂的临界条件。进一步的量纲分析表明惯性离心力、气流剪切力、壁面黏性力和表面张力共同决定着液膜的运动、变形直至破裂，由它们之间的平衡关系可以确定液膜的稳定与否。
이변계층이론위기출，기우독립가설건립료파형판통도내강액막재횡향기류구동하연굴절각횡향편이적이유변계층모형。통과량강분석화이상층류가설진행모형간화급변계층방정구해，건립료횡향절응력구동하파형판벽강막파렬적력평형모형병급출파막속도적림계준칙，모형포괄파형판통도궤하삼수、기액량상물성급류동삼수등다충인소적영향，여본문실험결과화이유이론모형진행대비，소건모형능구경준학지예측액막발생파렬적림계조건。진일보적량강분석표명관성리심력、기류전절력、벽면점성력화표면장력공동결정착액막적운동、변형직지파렬，유타문지간적평형관계가이학정액막적은정여부。
A two-dimensional boundary layer model was established to describe the lateral flow of falling films driven by horizontal gas flow in the wave-plate channel based on boundary layer theory and independence assumption. The model reduction was presented through dimensionless analysis and ideal laminar flow assumption. The theoretical model was built to predict the films lateral migration and separation under the horizontal interface shear stress based on analytical force balance. The effects of wave-plate structure, both physical properties and flow conditions of gas-liquid were considered to give a critical separation criterion of the falling films along wave-plate. The criterion was compared with experimental measurements and some published theoretical models. The present model led to significantly better agreement with the experimental results and can be used to predict the breakdown of the films more accurately. Dimensionless analysis showed that inertial centrifugal force, shear stress, viscous force and surface tension controlled the movement, deformation and breakdown of liquid films, whose instability was associated with the equilibrium of these four forces.