平板热管是一种外部为平板结构壳体，内部通过气液相变进行高效传热的元件。为研究平板热管的流固耦合及相变传热过程，根据平板热管传热物理模型，建立平板热管耦合传热数学模型。使用多松弛伪势格子Boltzmann方法计算热管内流体的相变传热，结合分区求解、边界耦合求解方式对平板热管流固耦合传热过程进行数值求解。对比多松弛伪势格子Boltzman模型和理论模型求解V形空腔气泡成核过程的结果，求解结果最大误差小于13%，验证了多松弛伪势格子Boltzman模型的准确性。通过对平板热管内的沸腾现象的模拟，得到了平板热管内流体的动态耦合传热温度场分布规律，为平板热管流固耦合及相变传热研究提供新的理论方法。

A flat heat pipe is a heat transfer element with a flat shell structure on the outside and efficient heat transfer through the phase change of gas and liquid inside. To study the fluid-solid coupling and phase change heat transfer process of a flat heat pipe, a coupled heat transfer mathematical model of a flat heat pipe based on its heat transfer physical model was established. The phase change heat transfer of the fluid in the heat pipe was computed using the multi-relaxation pseudo-potential lattice Boltzmann method, and the fluid-solid coupling heat transfer process of the flat heat pipe was numerically solved using the partitioned and boundary coupled solution method. The maximum error between the simulation results of the multi-relaxation pseudo-potential lattice Boltzmann model and the theoretical model for the nucleation process of a V-shaped cavity was less than 13%, verifying the accuracy of the multi-relaxation pseudo-potential lattice Boltzmann model. The dynamic coupled heat transfer temperature field distribution law in the fluid of a flat heat pipe was obtained through simulation, providing a new theoretical method for the fluid-solid coupling and phase change heat transfer research of flat heat pipes.