Presidential Young Investigators Award: Measurement of Multiphase Transport Using Magnetic Resonance Imaging

在这个PYI研究计划中，将集中在实验上测量多相系统的性质，解释这些测量结果，以便与当前的理论模型进行比较，并适当地改进模型。实验测量将利用磁共振成像。磁共振成像是一种非侵入性和非破坏性地获取样品中物种浓度、速度、扩散系数或温度的空间分布的光谱技术。具体的研究领域包括：1.多孔介质中的输运过程：计划进行实验测量单相流和多相流中的局部体积平均饱和度和速度。总体目标是在没有可调参数的情况下对实测场和预测场进行直接比较。2.颗粒沉降的结构和动力学：计划进行一系列模型实验，考察不同形状和大小的颗粒的沉降。其目的是获得具有不同体积分数的颗粒的悬浮液的定量微观结构数据，从稀释到浓缩，以及确定悬浮液性质是否会产生影响。

In this PYI research program will concentrate on experimentally measuring the properties of multiphase systems, interpreting these measurements for comparison to current theoretical models and refining the models appropriately. The experimental measurements will utilize magnetic resonance imaging. Magnetic resonance imaging is a spectroscopic technique for noninvasively and nondestructively acquiring the spatial distribution of species concentrations, velocities, diffusivities or temperatures within a sample. Specific areas of study are: 1. Transport processes in porous media: Experiments are planned to measure local volume averaged saturations and velocities in single-phase flow and multiphase flow in porous media. The overall objective is to make a direct comparison between measured and predicted fields in the absence of adjustable parameters. 2. Structure and dynamics of particle sedimentation: A series of model experiments is planned in which the sedimentation of various shaped and sized particles will be examined. The goal is to obtain quantitative microstructural data for suspensions having different volume fractions of particles, from dilute through concentrated, and ascertaining the effect if the suspending fluid properties.