CAJ | 학술논문

采用VOSET方法和耦合表面张力模型的N?S方程，模拟竖直通道内并排气泡对的上升过程，模拟与实验结果吻合较好。重点研究表面张力系数对并排气泡上升轨迹和速度的影响。结果表明，随着表面张力系数的变化，并排气泡对的上升过程出现三种类型：两气泡融合，两气泡反复靠近、远离但未融合，两气泡碰撞反弹后逐渐远离。在未融合的情况下，并排气泡对的上升轨迹关于通道中心线对称，左右两个气泡的上升速度基本一致，水平速度大小相同，方向相反。
채용VOSET방법화우합표면장력모형적N?S방정，모의수직통도내병배기포대적상승과정，모의여실험결과문합교호。중점연구표면장력계수대병배기포상승궤적화속도적영향。결과표명，수착표면장력계수적변화，병배기포대적상승과정출현삼충류형：량기포융합，량기포반복고근、원리단미융합，량기포팽당반탄후축점원리。재미융합적정황하，병배기포대적상승궤적관우통도중심선대칭，좌우량개기포적상승속도기본일치，수평속도대소상동，방향상반。
A numerical simulation was performed to investigate two bubbles rising side by side in vertical channel using VOSET ( Coupled Volume?of?Fluid and Level Set) method and N?S equations coupled with continuous surface force ( CSF) model. Behaviors of coalescence between two identical bubbles predicted were in good agreement with experimental results reported in literature. Effects of surface tension on trajectories and velocities during rising process are investigated. Three types of motion were observed depending on surface tension: Coalescence, two bubbles repeatedly attracted and bounced against each other, bounced and separated. Without coalescence, trajectory shows symmetry about channel center line. Vertical velocities of both bubbles are almost the same while magnitude of horizontal velocity with opposite direction equals.