On enhancing the performance of elbow thermosyphon heat pipes

默森加拿大公司位于安大略州密西索加市，是一家为高功率电气系统设计、制造和提供热管理解决方案的全球公司。其中包括专有的长翅片散热器、液体冷却系统和热管系统。加拿大默森公司坚定地致力于开发新的两相热管系统，为此，他们最近加强和扩大了在密西索加的测试设施。该项目专注于提高弯头热虹吸式热管的性能，该热管目前由加拿大默森公司制造，并用于许多热管理应用中。在该系统中，电子模块中的损耗产生的热量从散热器传输到由冲压气流或自然对流冷却的大的、近水平的延伸翅片表面。热虹吸管是 被动式两相热传输装置；在加热区域蒸发工质，在冷却区域冷凝，以较小的热阻传递热量。这里考虑的弯头热虹吸管与大多数热虹吸管的不同之处在于，它们是弯曲的，沿着受热表面传递，以提供更长的蒸发器部分，以满足热通量要求。由于应用程序的包装限制，Mersen Canada被迫处理弯曲的热虹吸管。工作流体是水，以满足环境限制。有必要改进弯头热虹吸管的性能，以便在气候变暖的市场上具有竞争力，并与更昂贵的冷却系统设计(如液体冷却)竞争。将进行实验以确定增强方法，其中将包括： 使蒸发器段倾斜，将内表面改变为灯芯结构，并在工作液中掺杂纳米颗粒。这些都已被证明可以降低直管热虹吸管的热阻。弯头热虹吸管性能的提高将为默森带来新的机会和市场，从而增加安大略省的销售额和生产规模。

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.