Thermal and dynamic evolution of a spherical bubble moving steadily in a superheated or subcooled liquid
Thermal and dynamic evolution of a spherical bubble moving steadily in a superheated or subcooled liquid
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过热或过冷液体中稳定移动的球形气泡的热和动态演化
DOI：
10.1063/1.869654
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发表时间：
1998
影响因子：
4.6
通讯作者：
J. Magnaudet
中科院分区：
文献类型：
--
作者：
D. Legendre;J. Borée;J. Magnaudet
采用数值模拟的方法，研究了单个变半径汽泡在过热或过冷液体中运动时的传热速率和所受的水动力。为此，在气泡表面稳定的参考系中求解完整的Navier-Stokes方程和温度方程。通过求解气泡表面的能量平衡来确定气泡半径的时间演化。数值方法首先验证通过比较目前的预测与以前的渐近或数值结果的情况下，液体和气泡之间没有相对运动的存在。然后考虑存在恒定相对速度的情况。首先讨论了平均流对传热速率和气泡半径演化的影响。在计算中通常观察到两个不同的阶段。首先，由气泡表面位移引起的径向运动占主导地位，气泡的演化是本质的。
The heat transfer rate and the hydrodynamic forces experienced by a single vapor bubble of variable radius moving in a superheated or subcooled liquid are studied by means of numerical simulation. For that purpose the full Navier–Stokes equations and the temperature equation are solved in a frame of reference where the bubble surface is steady. The time evolution of the bubble radius is determined by solving the energy balance at the bubble surface. The numerical method is first validated by comparing present predictions with previous asymptotic or numerical results in the case where no relative motion between the liquid and the bubble exists. Then the situation where a constant relative velocity exists is considered. Effects of the mean flow on the heat transfer rate and on the bubble radius evolution are first discussed. Two different stages are generally observed in the computations. First, the radial motion induced by the displacement of the bubble surface dominates and the bubble evolution is essenti...