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中文核心期刊

重力和接触角对表面张力贮箱内液体流动的影响

THE INFLUENCE OF GRAVITY AND CONTACT ANGLE ON THE LIQUID FLOW IN THE SURFACE TENSION TANK

  • 摘要: 采用流体体积函数方法数值模拟板式表面张力贮箱内液体的流动过程. 主要考虑了不同重力加速度和接触角等因素的影响. 发现在接触角等于10° 的前提下, 重力加速度小于10-2g0, 液体沿着外侧导流叶片爬升至贮箱顶部; 当重力加速度小于10-3g0 时, 重力加速度的减小对液体爬升速度的影响较小. 在爬升过程中, 导流叶片附近液体的速度呈逐渐减小的趋势, 且重力加速度越小, 初始速度越大. 接触角对液体的爬升高度也会产生影响,接触角越小, 液体爬升至顶部的时间越短; 当接触角大于45° 时, 外侧导流叶片附近的液面不能爬升至顶端. 另外, 接触角越大, 液面高度的斜率越小,导流叶片附近液体的初始速度也越小.

     

    Abstract: The flow behavior inside the vane surface tension tank is studied by using CFD-VOF method. Gravitational acceleration and contact angle are taken into consideration as control parameters. It is shown that when the contact angle is 10° and the gravitational acceleration is less than 10-2g0, the fluid reaches the top of the tank along the outer vanes. Moreover, the flow along the outer vanes is little influenced by the decrease of the gravitational acceleration when the gravitational acceleration is less than 10-3g0. The fluid velocity near the outer vanes decays gradually during the flow process, and the initial velocity depends on gravitational acceleration, the less gravitational acceleration, the larger initial velocity. Furthermore, the height of the flow climbing is impacted significantly by the contact angle. As the contact angle decreases the time of the fluid climbing to the top of the tank increased, and when the contact angle is greater than 45°, the fluid near the outer vanes cannot reach the top of tank. Ultimately, the relationship between the length of the climbing flow (L(t)) with the contact angle (θ) is also analyzed. It is observed that the increase of contact angle leads to the decreases of slope of the L(t) and the initial velocity of the fluid near the vanes.

     

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