Lattice Boltzmann simulation of nucleate pool boiling in saturated liquid
Lattice Boltzmann simulation of nucleate pool boiling in saturated liquid
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DOI：
10.4208/cicp.141109.161210s
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发表时间：
2011-03
影响因子：
3.7
通讯作者：
Yoshito Tanaka;M. Yoshino;T. Hirata
中科院分区：
文献类型：
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作者：
Yoshito Tanaka;M. Yoshino;T. Hirata
提出了一种求解核态池沸腾过程中两相流体流动的热格子Boltzmann方法。在本方法中，对于密度差较大的两相不混溶流体，在等温LBM中引入了一个新的传热函数。将计算出的温度代入压力张量，该张量用于计算代表两相的序参数，从而可以通过核态沸腾形成气泡。利用该方法，在恒定热流密度边界条件下，对固壁上热源作用下的核态池沸腾进行了二维数值模拟。得到了核态池沸腾过程中的流动特性和温度分布。结果表明，在浮力作用下，首先形成气泡形核，然后气泡长大并离开壁面，最后发生形变。此外，还数值研究了重力和表面润湿性对离开时气泡直径的影响。计算结果与已有实验数据的其他理论预测定性一致。
A thermal lattice Boltzmann method (LBM) for two-phase fluid flows in nucleate pool boiling process is proposed. In the present method, a new function for heat transfer is introduced to the isothermal LBM for two-phase immiscible fluids with large density differences. The calculated temperature is substituted into the pressure tensor, which is used for the calculation of an order parameter representing two phases so that bubbles can be formed by nucleate boiling. By using this method, two-dimensional simulations of nucleate pool boiling by a heat source on a solid wall are carried out with the boundary condition for a constant heat flux. The flow characteristics and temperature distribution in the nucleate pool boiling process are obtained. It is seen that a bubble nucleation is formed at first and then the bubble grows and leaves the wall, finally going up with deformation by the buoyant effect. In addition, the effects of the gravity and the surface wettability on the bubble diameter at departure are numerically investigated. The calculated results are in qualitative agreement with other theoretical predictions with available experimental data.