CAREER: Inertial Two-Phase Gas-Liquid Droplet Microflows

职业：惯性两相气液液滴微流

• 批准号: 1151091
• 负责人: Carlos Hidrovo Chavez
• 金额: $ 40万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-03-01 至 2015-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1151091&HistoricalAwards=false
• 关键词: CAREER; Inertial; Two; Phase; Gas

1151091HidrovoThis project aims to fundamentally understand the governing physics behind inertial two-phase gas-liquid droplet microflows, with the objective of developing novel microfluidic systems capable of microsecond processing times and tens of mL/min throughputs, simultaneously. The transformative aspect of the project resides in providing new insights into the emerging field of high speed inertial microfluidics and droplet microflows in specific. This understanding will lead to the development of next generation Lab-on-a-Chip (LOC) and micro-Total Analysis Systems (mTAS) with processing speed and throughput capabilities not seen before.The research aims to address (1) the role and interplay between inertial, viscous and surface tension forces in the droplet detachment mechanism, (2) mapping of the different flow regimes and transitions that can lead to droplet generation, and (3) the dynamics of inertial droplet collision mixing in a confined microchannel environment. Towards these goals, research efforts will be put forward that focus on the experimental study of the fast droplet dynamics and interactions through the use of novel optical diagnostics techniques. In specific, a microfluidic droplet generation platform that allows control and monitoring of the liquid and gas flows conditions will be coupled to a high speed microscopy system to study the liquid droplet entrainment dynamics. Similarly, a microfluidic droplet pair collision platform will be coupled to a high speed epi-fluorescence microscopy system, where differential dual fluorescence measurements and mPIV will be used as tools to unravel the fast dynamics associated with inertial collision mixing. The experimental work will be complemented by first order modeling and global force analysis of the different phenomena.The intellectual merit of the project includes elucidating the role of inertial effects in the detachment, entrainment and collision mixing of liquid droplets in confined gas carrier microflows. The test structures and experiments to be carried out in this study will provide unique insight into the effects that different flow and boundary conditions have on droplet formation and collision coalescence. The microfluidic test samples to be used are designed and fabricated so that the geometry and flow conditions under which the droplets interact can be carefully controlled, allowing for a clearer understanding of the effects that different microscopic geometrical parameters have on the entrainment and collision coalescence processes.The research endeavors and outcomes from this work will be integrated into educational and outreach activities that will introduce the field of microscale flow and transport to underrepresented undergraduate engineering and high school students early in their career. Innovative multilayer, self-sustainable programs geared towards development of teaching content while providing research training, will be introduced. Research training of individual students will take place through summer internship programs aimed at developing microfluidic and optical diagnostics lab modules and demonstrations. These will in turn be deployed and introduced in an undergraduate experimental class and several outreach programs, respectively.

1151091HIDROVOTHIS项目旨在从根本上了解惯性两相气体液滴液滴微流的治理物理学，目的是共同开发能够以微秒处理时间和数十个ML/MIN/Min吞吐量的新型微流体系统。该项目的变革性方面涉及特定于高速惯性微流体和液滴微流的新见解。 This understanding will lead to the development of next generation Lab-on-a-Chip (LOC) and micro-Total Analysis Systems (mTAS) with processing speed and throughput capabilities not seen before.The research aims to address (1) the role and interplay between inertial, viscous and surface tension forces in the droplet detachment mechanism, (2) mapping of the different flow regimes and transitions that can lead to droplet generation, and (3) the dynamics of惯性液滴碰撞在密封的微通道环境中混合。为了这些目标，将提出研究工作，通过使用新型的光学诊断技术，将重点放在快速液滴动力学和相互作用的实验研究上。在具体而言，允许控制和监测液体和气体流量条件的微流体液滴生成平台将耦合到高速显微镜系统，以研究液滴夹带动力学。同样，微流体液滴对碰撞平台将耦合到高速荧光显微镜系统，其中差分双荧光测量值和MPIV将用作工具，以揭示与惯性碰撞混合相关的快速动力学。实验工作将通过一阶建模和对不同现象的全球力量分析进行补充。该项目的智力优点包括阐明惯性效应在受限气体载体微龙中液滴的脱离，夹带和碰撞混合中的作用。在这项研究中要进行的测试结构和实验将为不同的流量和边界条件对液滴形成和碰撞聚结的影响提供独特的见解。设计和制造要使用的微流体测试样品，以便可以仔细控制液滴相互作用的几何和流量条件，从而更清楚地了解不同的微观几何参数对夹带和碰撞过程的微观几何参数的影响。在职业生涯的早期，代表性不足的本科工程和高中生。将介绍创新的多层，自我维持的计划，旨在在提供研究培训的同时提供教学内容。个人学生的研究培训将通过夏季实习计划进行，旨在开发微流体和光学诊断实验室模块和演示。 这些反过来将分别在本科实验班和几个外展计划中部署和引入。