Collaborative Research: bubble impacting a curved surface: a sustainable way to sanitize produce

合作研究：气泡撞击曲面：农产品消毒的可持续方法

• 批准号: 1919753
• 负责人: Sunny Jung
• 金额: $ 20.32万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-15 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1919753&HistoricalAwards=false
• 关键词: Collaborative; Research; bubble; impacting; curved; Collaborative; Research; bubble; impacting; curved

Cleaning practices using microbubbles have been proven to be a sustainable and environmently benign sanitation method in a wide range of industrial applications. When a stream of bubbles impact and slide on a surface, contaminants on the surface can be removed due to the strong force generated by the bubbles. Bubble-cleaning of agricultural produce like fruits and vegetables has not been studied extensively. Potentially, this method could be used to minimize cases of food poisoning affecting millions of people every year, since bubble streams could be used to remove and inactivate pathogenic microorganisms from produce surfaces. Understanding the bubble-surface interaction is challenging due to the fact that the process transpires over multiple length scales, in which bubble deformation and trajectory occur on the order of a millimeter while the liquid film between the bubble and solid involves only a few hundreds of nanometers. This research project could lead to a novel technology for an environmentally benign sanitization process for raw fruits and vegetables. The method could even be applied to other technological processes such as semiconductor manufacturing. The research project serves as a training ground for graduate and undergraduate students to perform cutting edge research. The research team will make an instructional video on how to make a bubble-stream fruit cleaner and share it via social media and web-based outlets at Cornell University. Farmers could use the video to learn how to put together their own bubble cleaners.The goal of this collaborative research project is to investigate both macro- and microscopic dynamics of a bubble impacting and sliding along a surface. This research will elucidate how bubbles remove particulate dirt or biological micro-organisms from a surface. There are limited studies in bubbly flows on tilted or curved surfaces, even though bubbles are used to clean various surfaces in many industrial processes. The research team will use high-speed photography, particle image velocimetry, pressure distribution measurements, and an interferometry microscopy technique to characterize shear and normal stresses, as well as thickness profiles of an asymmetric thin liquid film while bubbles impact on a surface. The research project involves three tasks:1) characterizing the macroscopic dynamics of a bubble on a surface as a function of the inclination angle and the curvature; 2) experimentally measuring and computationally modeling the shear stress and interfacial deformation of a bubble near the surface; and 3) testing the particle-scavenging and retaining performance of bacteria using agricultural products. The outcomes of this research will lead to an understanding of the underlying fluid mechanics in bubble sanitization technology.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.

在广泛的工业应用中，使用微泡的清洁实践已被证明是一种可持续和环境的良性卫生方法。当气泡撞击并滑动在表面上时，由于气泡产生的强力，可以去除表面上的污染物。尚未广泛研究农产品（如水果和蔬菜）的农产品泡沫清洁。 潜在地，该方法可用于最大程度地减少每年影响数百万人的食物中毒病例，因为气泡流可用于去除和失活的病原体微生物中的生物表面。 由于该工艺在多个长度尺度上跨越，其中气泡变形和轨迹在毫米的顺序上发生，而气泡和固体之间的液体膜仅涉及几百纳米纳米，因此了解气泡表面相互作用是具有挑战性的。该研究项目可能导致一种新的技术，用于针对原始水果和蔬菜进行环境良性的消毒过程。 该方法甚至可以应用于其他技术过程，例如半导体制造。该研究项目是研究生和本科生进行尖端研究的培训理由。 研究团队将制作一个教学视频，介绍如何制作泡泡流水果清洁剂，并通过康奈尔大学的社交媒体和基于网络的媒体分享。 农民可以使用视频来学习如何整理自己的泡泡清洁剂。该协作研究项目的目标是研究泡沫影响并沿着表面滑动的宏观和微观动态。 这项研究将阐明气泡如何从表面清除颗粒污垢或生物微生物。在倾斜或弯曲表面上的气泡流动的研究有限，即使在许多工业过程中使用气泡来清洁各种表面。研究团队将使用高速摄影，粒子图像速度计，压力分布测量和干涉测量学显微镜技术来表征剪切和正常应力，以及不对称薄液膜的厚度曲线，而气泡对表面的影响。 研究项目涉及三个任务：1）表征表面上气泡的宏观动力学作为倾斜角和曲率的函数； 2）实验测量和计算对表面附近气泡的剪切应力和界面变形进行建模； 3）使用农产品测试细菌的颗粒扫描和保留性能。这项研究的结果将导致对泡沫消毒技术中潜在的流体力学的理解。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来提供支持。