Simulation of Bubble Growth Process in Boiling Flow Using Lattice Boltzmann Method
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摘要: 利用基于格子Boltzmann(LB)方法开发的气液相变数值模型,考察在竖直方向重力加速度恒定的情况下,水平方向加速度对工质为水的流动沸腾中气泡生长过程的影响,可以发现:气泡脱离直径与水平方向加速度呈指数减小关系,气泡脱离频率与水平方向加速度呈指数增大关系;气泡脱离时,前接触角随水平方向加速度增大而增大,后接触角随水平方向加速度增大而减小,但当水平方向加速度增加到一定程度时,气泡前后接触角均趋于恒定;气泡脱离后,水平方向加速度越大,气泡越是贴近下边界运动。Abstract: A numerical model for liquid-vapor phase change, which is established by the lattice Boltzmann method, is employed to investigate the effect of horizontal acceleration on the growing process of the bubble in the boiling flow with constant gravitational acceleration. It can be found that the bubble departure diameter decreases exponentially and the release frequency increases exponentially with the horizontal acceleration. Before the detachment of the bubble, it is clearly shown the greater the horizontal acceleration, the greater the upstream contact angle and the smaller the downstream contact angle, and both the upstream and downstream contact angles reach constant as the horizontal acceleration increases to a certain degree. After the detachment of the bubble, the bubble motion trajectory is very close to the down boundary when the horizontal acceleration is large.
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Key words:
- Lattice Boltzmann method /
- Boiling flow /
- Bubble growth process /
- Phase change
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