Different techniques were stated in the published literature for predicting the thermal performance of wickless heat pipe (WHP) but detailed modeling results such as flow visualization, and heat transfer features through the geyser boiling occurrences inside the WHP are limited. Hence, it would be valuable to possess a CFD simulation modeling for the WHP. A two-dimensional CFD model of the WHP in ANSYS-Fluent was developed with an in-house code (user-defined functions) to enhance the simulation of the WHP operation which cannot be visualized by experimental studies. Temperature profiles and thermal resistance along the WHP have been investigated under various operating conditions in terms of filling ratios, inclination angles, and heat added. The predicted CFD results are validated against the available experiments with a good agreement. Thermal resistance along the WHP was reduced by rising the heat added. The results showed that the impact of the filling ratios on the average temperature of the evaporator wall at relatively high heat added is more clear compare with low heat added. The results highlighted that the developed CFD model of the WHP can visualize various forms of the droplet, boiling and condensation regimes, and heat transfer at different operating conditions.

在已发表的文献中陈述了用于预测无芯热管（WHP）的热性能的不同技术，但是详细的建模结果（例如流动可视化）以及通过WHP内部间歇沸腾发生的传热特征受到限制。因此，拥有WHP的CFD模拟模型将是有价值的。利用内部代码（用户定义的函数）开发了ANSYS-Fluent中WHP的二维CFD模型，以增强对WHP操作的仿真，这无法通过实验研究来可视化。在填充率，倾斜角度和添加热量方面，已经在各种操作条件下研究了沿WHP的温度分布和热阻。预测的CFD结果已针对现有实验进行了很好的验证。通过增加热量，降低了沿WHP的热阻。结果表明，与较低的热量添加相比，较高的热量添加时填充率对蒸发器壁平均温度的影响更为明显。结果强调，开发的WHP CFD模型可以可视化各种形式的液滴，沸腾和冷凝状态以及在不同操作条件下的传热。