In this work, a phase-change lattice Boltzmann model was employed to simulate the effects of two computational domains with confined space and free outlet boundary considering the conjugate heat transfer on entire nucleate boiling. This model was validated by Laplace's law and droplet wetting process, especially in the improved convective outlet boundary for multiphase flow in detail. The film boiling was employed to verify the phase change model quantitatively, and the results exhibited a good agreement with a theoretical model so that the accuracy and robustness of the current model were ensured. The dynamic behaviors of the entire nucleate boiling including nucleation embryo, embryo growth, twin and triple vapors coalescence, departure, rise and subsequent rupture were investigated comprehensively. The temperature and velocity fields, as well as pressure propagations associated with nucleate boiling were investigated. The automatically sharp growth of nucleation vapor pushes away the vicinity of vapor outwardly, while the bottom fluid still flows into the root of the vapor contact line, which coincides with experimental observation. The flow dynamic behaviors of double and triple bubbles coalescence are almost the same, whereas more isolated bubbles merge is beneficial to the growth and departure dramatically. The sliding growth on the heating substrate was found clearly, which is mainly due to the non-uniform temperature gradient below the two side of the vapor bubble. The curvilinear rising trajectory and large deformation of rising vapor bubbles were observed, leading to a temperature wake in the rear of the rising bubble. The increasing volume of the rising bubbles occurred in the free outlet domain was found, which is mainly caused by the combined pressure influence between the inside and vicinity of the bubble. Moreover, the comparisons of nucleate boiling in both two computational domains were also studied.

在这项工作中，采用相变晶格玻尔兹曼模型来模拟两个具有有限空间和自由出口边界的计算域的影响，其中考虑了共轭传热对整个核沸腾的影响。该模型已通过拉普拉斯定律和液滴润湿过程进行了验证，尤其是在改进的多相流对流出口边界中。通过薄膜沸腾定量验证了相变模型，结果与理论模型吻合良好，从而保证了当前模型的准确性和鲁棒性。全面研究了整个成核过程的动力学行为，包括成核胚，胚生长，孪生和三重蒸气的聚结，离去，上升和随后的破裂。温度场和速度场 以及与核沸腾有关的压力传播进行了研究。成核蒸气的自动急剧增长将蒸气附近区域向外推开，而底部流体仍流入蒸气接触线的根部，这与实验观察相吻合。双重气泡和三次气泡合并的流动动力学行为几乎相同，而更多的孤立气泡合并则极大地促进了生长和离开。清楚地发现在加热基底上的滑动生长，这主要是由于在蒸气泡的两侧下方的温度梯度不均匀所致。观察到曲线上升轨迹和上升蒸气气泡的大变形，导致上升气泡后部的温度上升。发现在自由出口区域中出现的上升气泡的体积增加，这主要是由于气泡内部和附近区域之间的综合压力影响引起的。此外，还研究了两个计算域中核沸腾的比较。