Exploring New Mechanistic Models for Pool Boiling Experiments on Nano-FIns

本提案的目的是建立新的机制模型来描述精确定义的纳米鳍结构上的池沸腾现象，并对这些模型进行实验验证。通过将该项目的研究课题与教育计划相结合，PI旨在增加知识基础，并在纳米尺度传输现象以及多相流和传热领域发展具有专业知识的人力资本。PI将通过开发一种涉及灵敏度分析的新的基本方法来实现研究目标，即通过测量沸腾过程对表面纳米结构引起的空间扰动的局部和全局响应。在密集的空间阵列中使用高速温度纳米传感器测量微/纳米尺度局部表面温度瞬变的空间分布。将监测全球热通量值，并探讨气泡动力学统计数据，包括增长率，偏离直径和频率。大量（1000+）高速纳米传感器获得的大量实验数据（表面温度瞬变）将使用计算可视化工具（动画）进行分析。非平衡分子动力学（NEMD）将用于估计不同纳米鳍材料（如有机、无机、金属和陶瓷）的Kapitza阻力（Rk），以便设计具有更好热效率的沸腾表面（纳米鳍）。纳米传感器的制造/测试、分子模型和池沸腾热通量相关性有望从本提议的研究中发展出来，对各种和未来的应用具有重要意义，包括：热管理（光电子），石油勘探（深钻），治疗/生物技术（基因组学/蛋白质组学快速热循环-扩增/诊断），能量转换和能源效率（暖通空调，太阳能热，地热和核热液压）。学校教师（RET）和少数民族学生（REU）将接受培训，开发实践学习模块，以便随后在课堂上使用，以激发学生早期的发现精神。教师的课堂反馈将用于改进连续几年的学习模块。实验装置（纳米传感器和纳米鳍）和模拟结果将作为示范模块在PI和学校老师讲授的课程中使用。

PI Name: Debjyoti BanerjeeCBET-1134424 The aim of this proposal is to develop novel mechanistic models for describing the pool boiling phenomena on precisely defined nano-fin structures and to experimentally validate these models. By integrating the research topics in this project with the education plans the PI aims to add to the knowledge base and to develop human capital with expertise in the domain of nanoscale transport phenomena as well as multi-phase flows and heat transfer. The PI will achieve the research goals by developing a new fundamental approach involving sensitivity analysis - i.e. by measuring the local and global response of the boiling process to the spatial perturbations caused by the surface nano-structures. The spatial distribution of the micro/nanoscale local surface temperature transients will be measured using high-speed temperature nano-sensors in a dense spatial array. The global heat flux values will be monitored and the bubble dynamics statistics will be explored including the growth rate, departure diameter and frequency. The high volume of experimental data (surface temperature transients) acquired by the large number (1000+) of high speed nano-sensors will be analyzed using computational visualization tools (animations). Non-Equilibrium Molecular Dynamics (NEMD) will be used to estimate the Kapitza resistance (Rk) of the different nano-fin materials (e.g., organic, inorganic, metallic and ceramic) - in order to design boiling surfaces (nano-fins) with better thermal efficacy.The fabrication/ testing of nano-sensors, molecular models and pool boiling heat flux correlations expected to be developed from this proposed study are of significance for diverse and futuristic applications, including: thermal management (opto-electronics), oil exploration (deep drilling), therapeutics/ biotechnology (rapid thermo-cycling for genomics/ proteomics - amplification/ diagnostics), energy conversion and energy efficiency (HVAC, solar-thermal, geo-thermal and nuclear thermal-hydraulics). School teachers (RET) and minority students (REU) will be trained for developing hands-on learning modules for subsequent use in the classes to kindle the spirit of discovery in the students at an early age. Class-room feedback from teachers will be used to improve the learning modules in successive years. The experimental set-up (nano-sensors and nano-fins) and the simulation results will be used as demonstration modules in courses taught by the PI and the school teachers.