A mathematical model that uses the concept of evaporation and condensation to explain the process of heat and mass transfer within the bent, flattened heat pipe has been established to predict its wall temperature and thermal resistance. When the heat pipe was bent and flattened in the application, the wick was damaged, resulting in less liquid being returned. It caused the wick to become unsaturated at the evaporator section. It can be determined that the liquid-vapor interface will gradually recede into the wick. This is defined as the “Receding” model (R). In the condenser section, the remaining condensate was collected as excess fluid. This is referred to as the “Excess Fluid” model (EF). It was observed that the low thermal conductivity of the unsaturated wick decreased the effective thermal conductivity at the evaporator section. The effective thermal conductivity at the condenser section also decreased due to the low thermal conductivity of the liquid film. The low effective thermal conductivity resulted in higher evaporator temperatures and lower condenser temperatures, resulting in higher thermal resistance. The established “REF” model has been validated in the same conditions by the experimental results and provides accurate predictions for the heat transfer performance of heat pipes.

建立了利用蒸发和冷凝的概念来解释弯曲扁平热管内传热传质过程的数学模型，预测其壁温和热阻。当热管在应用中被弯曲和压平时，灯芯被损坏，导致回流的液体减少。它导致灯芯在蒸发器部分变得不饱和。可以确定，液体-蒸汽界面将逐渐退回到灯芯中。这被定义为“后退”模型 (R)。在冷凝器部分，剩余的冷凝液作为过量流体被收集。这被称为“过量流体”模型 (EF)。据观察，不饱和芯的低热导率降低了蒸发器部分的有效热导率。由于液膜的低热导率，冷凝器部分的有效热导率也降低。低有效热导率导致更高的蒸发器温度和更低的冷凝器温度，从而导致更高的热阻。建立的“REF”模型在相同条件下得到了实验结果的验证，为热管的传热性能提供了准确的预测。