Upgrading of Particle Image Velocimetry (PIV) System to Allow Simultaneous Laser Induced Fluorescence (LIF)

升级粒子图像测速 (PIV) 系统以实现同步激光诱导荧光 (LIF)

• 批准号: 0345375
• 负责人: Peter Friedman
• 金额: $ 3.3万
• 依托单位: University of Massachusetts, Dartmouth
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-02-15 至 2005-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0345375&HistoricalAwards=false
• 关键词: Upgrading; Particle; Image; Velocimetry; PIV

0345375FriedmanUnder appropriate conditions the interaction between volcanic magma and surface water is explosive; however, volcanologists lack a fundamental understanding about the prerequisite phase mingling. With support from this grant, University of Massachusetts Dartmouth in collaboration with volcanologists from the University of Rhode Island will modify an existing particle image velocimetry (PIV) system to simultaneously capture laser induced fluorescence (LIF) images. Mingling mechanisms will be determined by superposing phase boundaries (from LIF) with velocity fields (from PIV) under varying flow conditions and geometries. LIF and PIV images are captured on separate cameras focused on a single image plane with the aid of a beam splitter and optical filters.The experimental upgrade has the potential to answer a broad range of additional questions of interest to NSF and Earth Sciences. For example, dispersion of particles injected into the upper atmosphere is dependent on the settling velocity. Research has shown that turbulent flow can either enhance or suppress the average settling rate. By using small reflective particles to map the flow structure and larger fluorescent particles to simulate impurities, the apparatus could be used to study the effect of turbulence on mean settling velocity. University of Massachusetts Dartmouth is a small university with a young but promising graduate education program serving the ethnically diverse communities of Fall River and New Bedford.***

在适当的条件下，火山岩浆和地表水之间的相互作用是爆炸性的；然而，火山学家们缺乏对先决条件阶段混合的基本了解。在这笔赠款的支持下，马萨诸塞大学达特茅斯大学将与罗德岛大学的火山学家合作，对现有的粒子图像测速(PIV)系统进行改造，以同时捕获激光诱导荧光(LIF)图像。混合机制将通过在不同流动条件和几何形状下叠加相边界(来自LIF)和速度场(来自PIV)来确定。在分束器和滤光器的帮助下，LIF和PIV的图像被聚焦在同一图像平面上的不同相机上捕获。这一试验性升级有可能回答NSF和地球科学感兴趣的一系列其他问题。例如，注入高层大气的粒子的扩散取决于沉降速度。研究表明，湍流可以提高或抑制平均沉速。通过使用较小的反射颗粒来描绘流动结构，使用较大的荧光颗粒来模拟杂质，该装置可以用来研究湍流对平均沉降速度的影响。马萨诸塞大学达特茅斯分校是一所小型大学，拥有年轻但前景看好的研究生教育项目，服务于福尔里弗和新贝德福德等种族多元化的社区。