Collaborative Research: A Micropatterned Wettability Approach for Superior Boiling Heat Transfer Performance

合作研究：一种微图案润湿性方法，可实现卓越的沸腾传热性能

• 批准号: 1235867
• 负责人: Daniel Attinger
• 金额: $ 14.32万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1235867&HistoricalAwards=false
• 关键词: Collaborative; Research; Micropatterned; Wettability; Approach

CBET-1235867PIs: Daniel Attinger (Iowa State Univ.) and C. Megaridis (UIC)This cross-institutional project straddles the areas of thermofluid engineering, materials science and optimization, with main goal to design, fabricate and study novel surfaces that are called ?superbiphilic.? These micro- and nanostructured surfaces juxtapose superhydrophobic areas (with strong affinities for water) with superhydrophobic areas (with strong affinities for water vapor). As such, they show superior performance in pool boiling by controlling the transport of the vapor and liquid phases in a parallel and optimal manner. The study will develop a novel coating-on-metal process, which is scalable and relevant to industrial heat exchangers. The main scientific challenge lies in understanding, controlling and optimizing boiling phenomena on the superbiphilic surfaces. For the first time, biphilic and superbiphilic surfaces will be fabricated on technically relevant, metallic substrates. The technology is based on sprayed-on patternable coatings, an industrial sector where US leadership is challenged from overseas. The research will develop a theoretical science base for boiling enhancement on biphilic and superbiphilic surfaces. The work is challenging because boiling involves multiphase and multiscale transport phenomena (evaporation starts in a sub-micrometer thick film, while detaching bubbles are millimeter-sized) and severely transient processes. To assist with the design and experiments, a modeling effort will be carried through. For simple surface topographies (or patterns of hydrophobic and hydrophilic domains), analytical models will be developed to explain the pool boiling enhancement in a qualitative manner. Computational fluid dynamic simulations will also be performed, to help understand the experimental data, identify the dynamic mechanisms responsible for the boiling enhancement, and evaluate the performance of complex surface topographies. The effort will feature a pattern design optimization approach to determine optimum topographies for boiling performance. The performance of the novel superbiphilic surfaces will be evaluated by a series of experiments, including surface wettability measurements, coating physical characterization, high speed visualization, as well as nucleation and pool boiling curves.The research, which involves rich fundamental phenomena in a variety of multidisciplinary topics, intends to deliver an innovative solution to transferring heat at superior rates in boiling configurations. The developments from this work will affect -among other technologies- heat exchangers, which are widely used in most energy-intensive industries, which collectively consume over 15 quadrillion Btu/yr in the US alone. Consequently, the non-incremental improvements resulting from this research have the potential to generate tremendous energy savings, and in turn, reduce energy waste and environmental pollution. Two graduate students will be educated in this program, and the team will reach out to underrepresented minorities in the Chicago area.

CBET-1235867PI：Daniel Attinger（爱荷华州立大学）和 C. Megaridis（UIC）这个跨机构项目横跨热流体工程、材料科学和优化领域，主要目标是设计、制造和研究被称为“超双亲”的新颖表面。这些微米和纳米结构表面将超疏水区域（对水具有很强的亲和力）与超疏水区域（对水蒸气具有很强的亲和力）并置。因此，它们通过以并行且最佳的方式控制气相和液相的传输，在池沸腾中表现出卓越的性能。该研究将开发一种新型金属涂层工艺，该工艺可扩展且与工业热交换器相关。主要的科学挑战在于理解、控制和优化超双亲表面的沸腾现象。双亲和超双亲表面将首次在技术相关的金属基材上制造。该技术基于喷涂可图案涂层，这是美国领先地位受到海外挑战的工业领域。该研究将为双亲和超双亲表面的沸腾增强奠定理论科学基础。这项工作具有挑战性，因为沸腾涉及多相和多尺度传输现象（蒸发在亚微米厚膜中开始，而分离气泡为毫米大小）和严重的瞬态过程。为了协助设计和实验，将进行建模工作。对于简单的表面形貌（或疏水和亲水域的模式），将开发分析模型来定性地解释池沸腾增强。还将进行计算流体动力学模拟，以帮助理解实验数据，确定导致沸腾增强的动态机制，并评估复杂表面形貌的性能。这项工作将采用模式设计优化方法来确定沸腾性能的最佳拓扑。新型超亲水表面的性能将通过一系列实验进行评估，包括表面润湿性测量、涂层物理表征、高速可视化以及成核和池沸腾曲线。这项研究涉及各种多学科主题的丰富基本现象，旨在提供一种创新的解决方案，以在沸腾配置中以优异的速率传递热量。这项工作的进展将影响热交换器等技术，这些技术广泛应用于大多数能源密集型行业，仅在美国，这些行业每年的总消耗量就超过 15 万亿英热单位。因此，这项研究带来的非渐进式改进有可能产生巨大的节能效果，进而减少能源浪费和环境污染。两名研究生将在该项目中接受教育，该团队将接触芝加哥地区代表性不足的少数族裔。