CAREER: Investigation of Boiling Heat Transfer Mechanisms and their Enhancement using Biotemplated Nanostructures

职业：研究沸腾传热机制及其使用生物模板纳米结构的增强

• 批准号: 1454407
• 负责人: Matthew McCarthy
• 金额: $ 50.78万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2021-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1454407&HistoricalAwards=false
• 关键词: CAREER; Investigation; Boiling; Heat; Transfer

CBET-1454407PI: McCarthy, MatthewPhase-change heat transfer is ubiquitous in industry, and it plays a critical role in electrical power generation, chemical processing, water purification, and HVAC systems. Modest enhancements in phase-change heat transfer can generate significant savings in energy and costs. Furthermore, innovative phase-change heat transfer systems are important not only due to their effects on energy usage, the environment, and water resources, but also due to the thermal management needs of next-generation high-power electronic and photonic systems. Recent studies have shown that high-surface-areas coatings comprised of nanostructures can be used to substantially increase performance during phase-change processes, and, in particular, during boiling heat transfer. However, numerous questions remain regarding the underlying physical mechanisms by which nanostructured coatings enhance heat transfer. The goal of this project is to utilize biotemplated nanofabrication to systematically investigate fundamental mechanisms by which nanostructured coatings affect and enhance phase-change heat transfer. Results from the research will be integrated into educational activities in nanoscale science and technology for high-school and university students, including a hands-on nanofabrication and thermal characterization experiment, a nano-thermal energy learning community, and opportunities for students to participate in the nanoscience research.The scientific objective of this CAREER development award is to leverage the simplicity and flexibility of biotemplated nanofabrication to investigate fundamental mechanisms by which nanostructured coatings affect liquid-to-vapor phase change during boiling. This will be accomplished using the self-assembly and metallization of the Tobacco mosaic virus (TMV) to fabricate tunable surface structures for novel and probative thermofluidic characterizations, leading to the realization of high-performance surfaces with heterogeneous architectures. Critical morphological and material properties will be tuned with unprecedented control, allowing systematic experimental characterizations, direct correlations to boiling phenomena, and the determination of new mechanistic models. Advanced imaging techniques based on IR thermometry and confocal scanning laser microscopy will permit simultaneous visualization and measurement of the wetting state, surface temperature, and local dynamic heat flux during boiling/evaporation. These measurements will be made possible due to the compatibility of biotemplating with low-conductivity and low-melting temperature polymeric materials. Lastly, novel surfaces with complex and heterogonous architectures (made possible via biotemplating) will be engineered for enhanced performance across all stages of boiling. These include surfaces with in-plane variations in materials and thermal conductivity, combined with superhydrophilic nanostructures.

CBET-1454407 PI：麦卡锡，马修相变传热在工业中无处不在，它在发电，化学加工，水净化和HVAC系统中发挥着关键作用。相变传热的适度增强可以显著节省能源和成本。此外，创新的相变传热系统非常重要，不仅因为它们对能源使用，环境和水资源的影响，而且还因为下一代高功率电子和光子系统的热管理需求。最近的研究表明，由纳米结构组成的高表面积涂层可用于大幅提高相变过程中的性能，特别是在沸腾传热过程中。然而，关于纳米结构涂层增强传热的基本物理机制仍然存在许多问题。该项目的目标是利用生物模板纳米制造来系统地研究纳米结构涂层影响和增强相变传热的基本机制。研究结果将被纳入高中和大学生的纳米科学和技术教育活动，包括动手纳米纤维和热表征实验，纳米热能学习社区，这个职业发展奖的科学目标是利用生物模板化纳米纤维的简单性和灵活性，研究纳米结构涂层在沸腾过程中影响液体-蒸汽相变的基本机制。这将使用烟草花叶病毒（TMV）的自组装和金属化来实现，以制造可调的表面结构，用于新的和证明性的热流体表征，从而实现具有异质结构的高性能表面。 关键的形态和材料特性将调整前所未有的控制，允许系统的实验表征，沸腾现象的直接相关性，并确定新的机械模型。基于红外测温和共聚焦扫描激光显微镜的先进成像技术将允许同时可视化和测量的润湿状态，表面温度和局部动态热通量在沸腾/蒸发。由于生物模板与低电导率和低熔点聚合物材料的相容性，这些测量将成为可能。最后，具有复杂和异质结构的新型表面（通过生物模板技术实现）将被设计用于提高沸腾所有阶段的性能。这些包括在材料和热导率的平面内变化的表面，与超亲水性纳米结构相结合。