Ultra high boiling performance on nano/microstructured surfaces through electrodeposition of copper and graphene

通过铜和石墨烯的电沉积在纳米/微米结构表面上实现超高沸点性能

• 批准号: 1335927
• 负责人: Satish Kandlikar
• 金额: $ 29.92万
• 依托单位: Rochester Institute of Tech
• 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 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1335927&HistoricalAwards=false
• 关键词: Ultra; boiling; performance; nano; microstructured

CBET 1335927PI: Kandlikar The proposed project Ultra High Pool Boiling Performance on Novel Microstructures through Pulsed Electrodeposition of Graphene/Carbon Nanotubes and their Copper Composites? strives to gain a fundamental understanding of the boiling mechanism over enhanced microstructured surfaces with nanocoatings at preferred locations. A new model that incorporates the role of microconvection in enhancing the boiling heat transfer will be developed and validated by using advanced visualization and measurement techniques employing high speed imaging (up to 25,000 fps), and microthermocouples of 5 - 13 µm dimensions. The model will be further validated through COMSOL Multiphysics® numerical simulation and pool boiling experiments over individually designed microsctruture features with nanocoatings applied over preferred regions. The fundamental insight gained through the localized bubble/liquid motion and the associated heat transfer will provide new avenues in enhancing and modeling the pool boiling heat transfer and critical heat flux (CHF). Some of the recent advances in the field of electrochemistry will be utilized in developing multi-porous graphene-based structures that are highly conductive and can provide controlled morphological features for heat transfer and CHF enhancement.The pool boiling constitutes an extremely important mode of heat transfer that is applied in a number of critical technologies including power generation (nuclear, fossil fuel, and alternative energy source based), electronics cooling, petrochemical and process industries, and air-conditioning and refrigeration applications. Heat transfer performance improvements in the boiling process are generally aimed at: (i) a reduction in the wall superheat, and (ii) an increase in the maximum heat transfer rate, identified as the critical heat flux. The proposed project provides a new pathway to address both of these performance improvement parameters. The new approach and the modeling proposed in this project will provide a new pathway in improving energy efficiencies of devices utilizing the boiling process. This is in particular of great significance for utilizing alternative thermal energy sources, since the available temperature differences are generally low and are of critical importance.

CBET 1335927 PI：Kandlikar建议项目超高池沸腾性能的新型微结构通过脉冲电沉积石墨烯/碳纳米管及其铜复合材料？致力于获得在优选位置具有纳米涂层的增强微结构表面上的沸腾机理的基本理解。一个新的模型，结合微对流在增强沸腾传热的作用将开发和验证使用先进的可视化和测量技术，采用高速成像（高达25,000 fps），和微型热电偶的5 - 13微米的尺寸。该模型将通过COMSOL Multiphysics®数值模拟和池沸腾实验进一步验证，这些实验针对单独设计的微结构特征，并在优选区域上涂覆纳米涂层。通过局部气泡/液体运动和相关的传热获得的基本见解将提供新的途径，在增强和模拟池沸腾传热和临界热通量（CHF）。电化学领域的一些最新进展将用于开发多孔石墨烯基结构，这些结构具有高导电性，并且可以为传热和CHF增强提供受控的形态特征。池沸腾构成了一种极其重要的传热模式，其应用于包括发电在内的许多关键技术中（基于核能、化石燃料和替代能源）、电子冷却、石化和加工工业以及空调和制冷应用。沸腾过程中传热性能的改善通常旨在：（i）减少壁面传热，以及（ii）增加最大传热速率，即临界热通量。拟议的项目提供了一个新的途径来解决这两个性能改进参数。本研究提出的新方法和模型将为利用沸腾过程提高设备能效提供一条新的途径。这对于利用替代的热能源特别重要，因为可用的温差通常很低并且至关重要。