On enhancing the performance of elbow thermosyphon heat pipes

Mersen Canada Inc.，位于密西索加，是一家全球性的大功率电气系统热管理解决方案的设计商、制造商和供应商。这些包括专有的长翅片散热器，液体冷却系统和热管系统。默森加拿大公司致力于开发新型两相热管系统，为此，他们最近加强和扩大了在密西索加的测试设施。该项目的重点是提高弯头热虹吸热管的性能，默森加拿大目前制造的，并在一些热管理应用中使用。在该系统中，由电子模块中的损耗产生的热量从散热器传输到大的、接近水平的延伸翅片表面，该翅片表面通过冲压空气流或自然对流冷却。热虹吸管是 被动两相热传输装置;在加热区域中蒸发工作流体，并在冷却区域中冷凝工作流体，从而以小的热阻传递热量。这里考虑手肘热虹吸管与大多数热虹吸管的不同之处在于，弯管热虹吸管被弯曲以沿加热表面沿着通过，从而提供更长的蒸发器截面以满足热通量要求。由于应用的包装限制，Mersen Canada被迫处理弯曲的热虹吸管。工作流体是水，以满足环境约束。需要改进手肘热虹吸管的性能，以在具有较温暖气候的市场中具有竞争力，并且与更昂贵的冷却系统设计（例如液体冷却）竞争。将进行实验以确定增强方法，包括： 倾斜蒸发器部分，将内表面改变为芯结构，以及用纳米颗粒掺杂工作流体。这些已被证明可以降低直热虹吸管的热阻。弯管热虹吸管性能的改善将为Mersen带来新的机会和市场，从而增加销售额并扩大安大略的制造足迹。

Mersen Canada Inc., located in Mississauga, ON, is a global designer, manufacturer, and provider of thermal management solutions for high power electrical systems. These include proprietary long-finned heat sinks, liquid cooled systems and heat pipe systems. Mersen Canada is strongly committed to developing new two-phase heat pipe systems and, to that end, they recently enhanced and expanded their test facilities at Mississauga. This project focusses on improving the performance of elbow thermosyphon heat pipes that Mersen Canada currently manufactures for, and uses in a number of thermal management applications. In this system, heat generated by losses in electronic modules is transported from a heat spreader to large, near-horizontal extended fin surfaces that are cooled by ram air-flow or natural convection. Thermosyphons are passive two phase heat transport devices; evaporating a working fluid in heated regions and condensing it in cooled regions, to transfer the heat with a small thermal resistance. The elbow thermosyphons considered here differ from most thermosyphons in that they are bent to pass along the heated surface to provide longer evaporator sections to meet the heat flux requirements. Mersen Canada is forced to deal with bent thermosyphons due to the packaging constraints of the application. The working fluid is water to meet environmental constraints. There is a need to improve the performance of the elbow thermosyphons to be competitive in markets with warmer climates, and to compete with more expensive cooling system designs, such as liquid cooling. Experiments will be performed to determine methods of enhancement that will include: inclining the evaporator section, changing the interior surface to a wick structure, and doping the working fluid with nanoparticles. These have been shown to reduce the thermal resistance of straight thermosyphons. An improvement in the performance of elbow thermosyphons will lead to new opportunities and markets for Mersen, which a resultant increase in sales and larger manufacturing footprint in Ontario.