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

该项目的重点是在纳米工程表面，如纳米多孔膜和纳米鳍表面的传输现象，导致意想不到的高蒸发通量。 这些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，包括与使用高功率可穿戴和便携式电子设备相关的深刻的社会和健康影响。该项目还包括教育和外联部分，如“触摸纳米”，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装置连接起来，向学童、本科生和研究生讲授纳米运输中的尺寸和尺度效应。本论文的主要目标包括：（i）通过对表面吸附层界面输运的定量分析和对传统薄膜蒸发模型的修正，弥补纳米结构表面蒸发实验结果与薄膜蒸发理论之间的差距; ㈡利用两个独立的（自下而上和自上而下）数值建模方法，并通过利用使用高速和高分辨率测量进行的实验来验证其预测。将利用一个实验平台，通过整合表面等离子体共振和共聚焦扫描显微镜技术，实施新的开发和测试方案，以便沿着用于局部温度测量的高密度温度纳米传感器阵列测量瞬态蒸发质量通量;（三）设计和优化纳米鳍和纳米多孔表面，以实现最高的传热率。该奖项反映了NSF的法定使命并通过使用基金会的知识价值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.