Under both normal gravity and microgravity conditions, pool boiling is an efficient mode of heat transfer which has been widely applied in practice. Studying the influence of gravitational acceleration on boiling heat transfer is not only of academic significance, but also helpful for the design of space equipment related to boiling. With the development of computer technology, numerical method has been a new reliable way to investigate the boiling heat transfer under different gravities. Pseudopotential lattice Boltzmann (i.e., LB) model is one of the most popular multiphase LB models, in which the phase interface could be formed, disappeared and migrated naturally. In this paper, the Multi-Relaxation-Time (i.e., MRT) pseudopotential LB model coupled with phase-change model was applied to simulate the pool boiling heat transfer under different gravitational accelerations and wall superheats. Pool boiling curves under different gravities were obtained. It’s found that: 1) the pool boiling heat transfer coefficient at a given wall superheat decreases with a decrease in gravity; 2) the wall superheat, as well as heat flux, at the CHF (i.e., critical heat flux) point and ONB (i.e., onset of the nucleate boiling) decrease gradually with a decrease in gravity. In addition, based on the numerical results, a new gravity scaling model was proposed to predict the influence of gravitational acceleration on the nucleate boiling heat transfer under different wall superheats. Finally, the new gravity scaling model was proved to be capable of predicting the heat flux during the nucleate boiling under different wall superheats and gravities.

在正常重力和微重力条件下，池沸腾是一种有效的传热方式，已在实践中得到广泛应用。研究重力加速度对沸腾传热的影响不仅具有学术意义，而且对与沸腾有关的空间设备的设计也有帮助。随着计算机技术的发展，数值方法已经成为研究不同重力下沸腾传热的一种可靠的新方法。伪势格玻尔兹曼模型（即LB）是最流行的多相LB模型之一，其中相界面可以自然形成，消失和迁移。在本文中，多重放松时间（即 运用MRT的准势LB模型与相变模型相结合，模拟了在不同重力加速度和壁过热条件下的池沸腾传热。得到了不同重力下的池沸腾曲线。发现：1）给定壁过热度下的池沸腾传热系数随着重力的降低而减小；2）随着重力的降低，在CHF（即临界热通量）点处的壁过热以及热通量和ONB（即核沸腾的开始）逐渐降低。另外，基于数值结果，提出了一种新的重力尺度模型，以预测重力加速度对不同壁过热度下核沸腾传热的影响。最后，