Understanding and Controlling Hydrodynamic Cavitation to Improve Manufacturing Processes Involving High Velocity Fluid Flow

了解和控制水动力空化以改进涉及高速流体流动的制造工艺

基本信息

批准号：
2043325
负责人：
Gracious Ngaile
金额：
$ 35.49万
依托单位：
North Carolina State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-03-01 至 2025-02-28
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2043325&HistoricalAwards=false
关键词：
Understanding Controlling Hydrodynamic Cavitation Improve

项目摘要

This grant supports research that contributes new knowledge in the manufacturing field, promoting both progress of science and engineering and advancing national prosperity. Hydrodynamic cavitation is the formation, growth, and burst of gas bubbles in a rapidly flowing fluid. The resulting implosion of gas bubbles releases concentrated energy as pressure waves or high-speed micro jets. The impact of this project is on multiple fronts; the potential to reduce total energy spent in manufacturing processes, increase in the quality of the produced parts and fabrication of part features that are difficult to achieve with conventional manufacturing processes. The knowledge gained from this project could also be used to enhance the efficiency of existing cavitation-based systems in other areas beyond manufacturing such as cleaning devices, water purification, and homogenization of industrial and food products. The experimental and analytical work emanating from this project provides excellent educational opportunities to graduates and undergraduate students participating in the research. Particular emphasis is placed on engaging women and minority students in this project. The project also supports several classroom teaching initiatives within the manufacturing curriculum.The goal of this project is to advance the fundamental understanding of mechanisms for producing hydrodynamic cavitation from a high velocity fluid stream in a manufacturing process so that the pressure waves and micro-jets produced by this cavitation could be utilized to enhance the process. A combination of experimentation and analytical and numerical modeling is used to study different mechanisms for producing and controlling hydrodynamic cavitation. The study includes (1) characterization of hydrodynamic cavitation intensity via novel flow-induced vibration at various resonance frequencies, (2) characterization of vortex flows that can generate continuous and fully cavitating fluid streams thus increasing the yield on the energy to be harvested, and (3) development of mechanisms for creating self-resonating flows via superposition of pressure waves aimed at enhancing bubble collapse frequency. The analytical modeling provides an estimate of pressure induced during bubble collapse, whereas numerical modeling provides field variables depicting distribution behavior of cavitation in the fluid domain. To quantify the cavitation power density obtained from the above mechanisms, residual stresses and microhardness distributions measured from samples are mapped with field variables from numerical and analytical models. This project is aimed at creating a knowledge base to facilitate utilization of the cavitation energy to enhance manufacturing processes that involve high velocity fluid flow such as water jet cutting, water jet peening for surface treatment, nano-lubricant formulation, and polishing.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.

这项赠款支持研究在制造领域有助于新知识的研究，促进了科学和工程的进步并促进国家繁荣。流体动力的空化是快速流动的流体中气泡的形成，生长和爆发。由于压力波或高速微型喷气机，气泡的产生内爆会释放出浓缩能量。该项目的影响是多个方面。减少制造过程中花费的总能量，提高生产零件的质量以及制造零件特征的潜力，这些特征很难实现传统的制造工艺。从该项目中获得的知识也可以用来提高在制造业之外的其他领域中基于空化的系统的效率，例如清洁设备，水净化以及工业和食品的均质化。该项目发出的实验和分析工作为毕业生和本科生参加了这项研究提供了极好的教育机会。特别重点是吸引妇女和少数族裔学生参与该项目。该项目还支持制造课程中的几项课堂教学计划。该项目的目的是促进对从高速流体流中产生流体动力空化的机制的基本理解，以便可以利用由这种空化产生的压力波和微型喷射器来增强该过程。实验与分析和数值建模的组合用于研究产生和控制流体动力学空化的不同机制。该研究包括（1）通过各种共振频率下的新流动诱导振动来表征流体动力学强度的表征，（2）涡流流的表征，涡流流可以产生连续且充分的流体流，从而提高了要收获的能量的产量，以及（3）通过压力促进pubs pubs pucte pods parts surpoding air促进的机制，以增强速度的促进。分析建模提供了气泡塌陷期间诱导的压力的估计，而数值建模提供了描述流体结构域中空化的分布行为的场变量。为了量化从上述机制获得的空化功率密度，用样品测得的残余应力和微硬度分布与数值和分析模型的场变量映射。该项目旨在创建一个知识库，以促进空化能源的利用来增强制造过程，涉及高速液体流动，例如水上喷射式切割，水上喷气式进行表面处理，纳米润滑剂配方和抛光。该奖项反映了NSF的法定任务，并通过评估范围来反映了范围的范围。