Many elder tunnels often lack waterproofing facilities, and water can easily accumulate in tunnel bottom or even on cable surface. Using the finite element method (FEM), the three-dimensional tunnel cable model, which couples the fluid field, the heat transfer and the moisture transport, is developed in our study. The coupling effects especially the phase change behavior are comprehensively considered. It indicates that a high humid environment would benefit the heat dissipation. Depending on the initial vapor content, water distribution, and cable arrangement, the maximum cable temperature may drop to some extent ranging from 2 °C to 10 °C. The presence of water changes the thermal properties of air, including the thermal conductivity and heat capacity. The latent heat caused by evaporation accounts for a greater portion compared to conduction. The presence of water changes the vapor concentration distribution of tunnel. It is mainly located near the cable surface within a distance of 0.02 m, and it decreases drastically away from the cable. In addition to common radial heat transfer, both the longitudinal and circumferential heat flux exists arising from the movement of fluid flow and water evaporation.

中文翻译：

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考虑热湿耦合传递的湿式隧道电缆温度研究


许多老隧道往往缺乏防水设施，隧道底部甚至电缆表面很容易积水。我们的研究中使用有限元方法（FEM）开发了耦合流体场、传热和水分传输的三维隧道电缆模型。综合考虑耦合效应尤其是相变行为。这表明高湿度的环境有利于散热。根据初始蒸汽含量、水分布和电缆布置，电缆最高温度可能会下降 2°C 至 10°C 之间。水的存在会改变空气的热特性，包括导热率和热容。与传导相比，蒸发引起的潜热所占比例更大。水的存在改变了隧道内的水蒸气浓度分布。主要分布在靠近电缆表面0.02 m范围内，远离电缆急剧减小。除了常见的径向传热外，还存在由流体流动和水蒸发引起的纵向和周向热通量。