Development of a Designer Fluid for Phase Change Heat Transfer in Different Materials

开发用于不同材料相变传热的设计流体

• 批准号: 1336896
• 负责人: Ivan Catton
• 金额: $ 24.5万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1336896&HistoricalAwards=false
• 关键词: Development; Designer; Fluid; Phase; Change

CBET 1336896PI: CattonThe project goals are twofold; 1) yield an understanding of the chemistry of an inorganic aqueous solution that is sufficient to develop a ?designer fluid? for a particular heat transfer application and 2) establish the ability of such a designer fluid to enhance heat transfer in the phase change device (heat pipes, recuperators, and/or thermosiphons) within which it is to be used. The understanding of the chemistry, the first part of the project, will be quantified to establish the impact of the type and amount of the chemical constituents. A library of various applications and suggested chemical constituents will be developed. What is needed to passivate various materials, to relate the mixture constituents and their molality to passivation, hydrophilicity, surface deposition and microstructure will be established. The second part of the project is to quantify the capacity of a designer fluid to enhance heat transfer in the device in which it is to be used. A correlation between the deposition of material and construction of the micro-porous coatings to the chemistry, pH and temperature of the mix will be developed. The heat transfer will be related to the amount and type of constituents and their capacity to construct micro-porous coatings on a surface and to the hydrophilicity and capillarity of the surface microstucture. The impact of such a designer fluid on the effectiveness of various types of wicking will complete the project. Water is one of natures best heat transfer fluids when phase change is involved because it has the highest heat of evaporation. Unfortunately water is also a good oxidizer and can lead to corrosion and, if a metal, hydrogen production that can seriously degrade the heat transfer performance. Presently, water can only be used with metals like copper. In this work, a novel, inorganic aqueous solution is developed for use with aluminum and other material heat pipes and thermosiphons that will improve the heat transfer performance by as much as a factor of two. The chemical reactions responsible for passivating the device material interior and preventing generation of non condensible gases (NCG) will be explained. Being able to use a phase change heat transfer fluid that has the equivalent or better heat transfer performance than water in a range of different materials will have a significant impact on many aspects of the power generation, process and electronics industries and our ability to harvest waste heat.

CBET 1336896 PI：Catton该项目的目标是双重的; 1）产生的无机水溶液的化学的理解，足以开发一个？设计师流体？用于特定的热传递应用，以及2）建立这种设计流体增强相变装置（热管、同流换热器和/或热虹吸管）中的热传递的能力，在所述相变装置中使用所述设计流体。化学的理解，该项目的第一部分，将被量化，以建立化学成分的类型和数量的影响。将开发各种应用和建议的化学成分库。将建立钝化各种材料所需的内容，将混合物成分及其摩尔浓度与钝化，亲水性，表面沉积和微观结构联系起来。该项目的第二部分是量化设计流体的能力，以增强其使用的设备中的热传递。将开发材料的沉积和微孔涂层的构造与混合物的化学、pH和温度之间的相关性。热传递将与组分的量和类型及其在表面上构造微孔涂层的能力以及表面微结构的亲水性和毛细作用有关。这种设计师流体对各种类型的芯吸效果的影响将完成该项目。水的蒸发热最高，是发生相变时自然界最好的传热流体之一。不幸的是，水也是一种良好的氧化剂，并且可能导致腐蚀，并且如果是金属，则会产生氢气，这会严重降低传热性能。目前，水只能用于铜等金属。在这项工作中，开发了一种新型的无机水溶液，用于铝和其他材料的热管和热虹吸管，将提高传热性能的两倍。将解释负责钝化器械材料内部和防止产生不可冷凝气体（NCG）的化学反应。能够在一系列不同的材料中使用具有与水相当或更好的传热性能的相变传热流体将对发电、加工和电子工业的许多方面以及我们收集废热的能力产生重大影响。