Collaborative Research: Investigation of Anomalous Transport Phenomena During Evaporation from Nano-Engineered Surfaces

这个项目的重点是在纳米工程表面，如纳米多孔膜和纳米翅片表面，导致蒸发通量出乎意料地高的传输现象。这种表面的设计和优化对于从电子冷却到国防的各种热管理应用非常重要，包括与使用高性能可穿戴和便携式电子设备相关的深远的社会和健康影响。该项目还包括教育和推广部分，如“Touch Nano”，这是一个互动软件，将实时分子动力学模拟数据与触觉力反馈设备连接起来，向在校儿童、本科生和研究生教授纳米运输中的尺寸和尺度效应。拟议工作的主要目标包括：(I)通过量化表面吸附层的界面传输和修正传统的薄膜蒸发模型，弥合最近关于纳米结构表面蒸发的实验结果与薄膜蒸发理论之间的差距；(Ii)利用两种独立的(自下而上和自上而下)数值模拟方法，并通过利用高速和高分辨率测量进行的实验来验证它们的预测。新的开发和测试协议将使用一个实验平台来实施，该平台集成了表面等离子体共振和共聚焦扫描显微镜技术来测量瞬时蒸发质量通量，以及用于局部温度测量的高密度温度纳米传感器阵列；(Iii)纳米翅片和纳米多孔表面的设计和优化，以实现尽可能高的热传输率。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This project focuses on transport phenomena leading to unexpectedly high evaporative fluxes at nano-engineered surfaces such as nanoporous membranes and nanofin surfaces. Design and optimization of such surfaces is important for diverse thermal management applications from electronics cooling to defense, including profound social and health impacts related to the use of high-powered wearable and portable electronic devices. The project also contains educational and outreach components, such as “Touching Nano”, an interactive software that will interface real-time molecular dynamics simulation data with a haptic force feedback device to teach size and scale effects in nano-transport to school children, undergraduate and graduate students. The key objectives of the proposed work include (i) bridging the gap between the recent experimental results on evaporation in nanostructured surfaces and theory of thin film evaporation by quantification of interfacial transport from surface adsorbed layers and revision of the conventional thin film evaporation models; (ii) Utilization of two independent (bottom-up and top-down) numerical modeling approaches and validation of their predictions by leveraging experiments conducted using high-speed and high-resolution measurements. Novel development and testing protocols will be implemented using an experimental platform by integrating Surface Plasmon Resonance and confocal scanning microscopy techniques to measure the transient evaporation mass flux along with high-density temperature nano-sensor arrays for local temperature measurements; (iii) Design and optimization of nanofin and nanoporous surfaces for enabling the highest possible rates of heat transfer.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.