MRI: Development of a Spatiotemporal Velocimetry with Simultaneous Size Measurements for Polydispersed Multi-Phase Flows

CTS-0521102P。Vlachos，Virginia Polytechnic InstituteThis grant is to develop a unique instrumentation system for spatially resolved，simultaneous velocity and particle size measurements in polydispersed multi-phase flow with kHz temporal resolution. 该系统将用于生物流体力学，环境水力学和生物流体。 这些看似无关的流体力学领域都需要解决与流体运动沿着多分散颗粒在各向异性流中的运动相关的未回答的问题，所述各向异性流由湍流或不稳定性控制，包括广泛的流尺度和结构。 现有的仪器无法提供具有足够采样频率的时空分辨测量，以捕获湍流波动，同时测量颗粒尺寸和尺寸分布。 新的时间分辨数字粒子图像测速仪（TRDPIV）仪器将提供硬件和算法的进步，以克服多分散多相流测量中存在的实验挑战。 新系统结合了传统DPIV在空间上分辨流动的优点、激光多普勒测速法或热线测量高频速度波动的优点以及相位多普勒颗粒风速测量法测量颗粒尺寸的优点。根据这项赠款开发的仪器将对实验流体力学界产生直接和广泛的影响。多相流，例如颗粒输送和碰撞、凝聚、浮选、喷雾雾化和气泡动力学，存在于各种各样的工业中，例如化学、航空/航天、海军、发电、汽车和生物医学。 一个新的独特的测量能力将提供给研究人员和工程师在所有这些领域，从而有一个间接的，但非常广泛的影响，对国家的工业和研究基础设施。 将通过重点突出的努力，促进本科生和研究生在招聘代表性不足的妇女和少数民族方面的研究，对多样性产生广泛和直接的影响。将通过对将开发和使用拟议系统的研究生和本科生进行全面培训和指导来实现教育影响。更广泛的教育影响将扩展到研究生和本科生课堂，该系统将用于教授先进的实验方法，并在我们所需的流体力学课程中进行演示。

CTS-0521102P. Vlachos, Virginia Polytechnic InstituteThis grant is to develop a unique instrumentation system for spatially resolved, simultaneous velocity and particle size measurements in polydispersed multi-phase flows with kHz temporal resolution. The system will be used in biofluid mechanics, environmental hydraulics, and turbomachinery flows. These seemingly unrelated areas of fluid mechanics share the fundamental need to address unanswered questions relating the fluid motion along with the motion of polydispersed particulates in anisotropic flows that are governed by turbulence or unsteadiness encompassing a wide range of flow scales and structures. Existing instrumentation fails to deliver spatio-temporally resolved measurements with sufficient sampling frequency to capture turbulent fluctuations while simultaneously measuring the particulate size and size distribution. The new Time Resolved Digital Particle Image Velocimeter (TRDPIV) instrumentation will deliver hardware and algorithm advancements to overcome the experimental challenges present in polydispersed multiphase flow measurements. The new system combines the advantages of conventional DPIV to spatially resolve a flow with the advantages of Laser Doppler Velocimetry or hot-wires to measure high frequency velocity fluctuations and the advantages of Phase Doppler Particle Anemometry to measure particle sizes. The instrumentation developed under this grant will have a direct and broad impact upon the experimental fluid mechanics community. Multi-phase flows such as particle transport and collision, coagulation, flotation, spray atomization and bubble dynamics are present in a wide variety of industries such as chemical, aeronautical/aerospace, naval, power generation, automotive and biomedical. A new unique measurement capability will be available to researchers and engineers in all these areas thus having an indirect yet very broad impact on the nation's industrial, and research infrastructure. Broad and direct impact on diversity will be achieved through well-focused efforts to promote undergraduate and graduate research in recruiting underrepresented women and minorities. Educational impact will be achieved through thorough training and mentoring of graduate and undergraduate students that will be developing and using the proposed system. The broader educational impacts will extend to the graduate and undergraduate classrooms where the system will be used for teaching advanced experimental methods and performing demonstrations in our required fluid mechanics courses.