New Filtration Theory via Incorporation of Pore Scale Mechanisms Operating in the Presence of an Energy Barrier

本文的主要目的是建立一种能障条件下胶体与表面之间存在能障（排斥）的颗粒含水介质中胶体滞留的机理模型，该模型能准确地预测胶体在颗粒含水介质中的滞留情况。拟议的研究活动是建立在先前开发的平台上的胶体保留在没有能量障碍（胶体过滤理论- CFT）的机制描述。主要的研究假设是，胶体保留的模拟值将匹配的趋势和值从实验中使用一个创新的孔域，结合了正确的保留机制，在存在能量障碍。这一假设将使用一种适应性战略进行测试，该战略根据调查结果确定工作的优先次序。这些方法的成功将通过与在孔隙到连续规模实验中观察到的胶体保留的趋势和量化值进行比较来衡量。将使用计算流体动力学（CFD）方法在孔隙域中求解流场。模拟和实验的趋势和胶体保留参数的大小将在一系列的胶体收集器的尺寸比，流体速度，和胶体收集器的相互作用energy.Scientists，从业者，监管机构和公众将受益于一个准确的方法预测收集器的效率条件下，排斥存在。两个博士候选人将开始与这个项目，和研究助理谁也恰好是一个单身母亲的职业前景将进一步通过这个项目。将以在大盐湖上乘船旅行的形式向小学生进行宣传，以便与科学家合作，提供基于调查的实践探索，探索湖泊分层沃茨中各种微粒的作用，例如从光合作用到污染物清除和沉淀。

ABSTRACTCBET- 0822102Johnson, William P.University of UtahNew filtration theory via incorporation of pore scale mechanisms operating in the presence of an energy barrierThe principal objective of this proposal is to develop mechanistic models which accurately predict the retention of colloids in granular aquifer media under environmental conditions, where energy barrier (repulsion) exists between colloids and surfaces. The proposed research activities are to build on the platform previously developed for mechanistic description of colloid retention in the absence of an energy barrier (colloid filtration theory - CFT). The primary research hypothesis is that simulated values of colloid retention will match trends and values from experiments by using an innovative pore domain that incorporates the correct retention mechanisms operating in the presence of an energy barrier. This hypothesis will be tested using an adaptive strategy that prioritizes the work according to findings. The success of the approaches will be measured by comparison to trends and values quantifying colloid retention observed in pore- to continuum-scale experiments. The flow field will be solved in the pore domains using computational fluid dynamics (CFD) approaches. Simulated and experimental trends and magnitudes of colloid retention parameters will be compared across a range of colloid-collector size ratios, fluid velocities, and colloid-collector interaction energies.Scientists, practitioners, regulators, and the general public will benefit from an accurate method of prediction of collector efficiencies under conditions where repulsion exists. Two Ph.D. candidacies will be initiated with this project, and the career prospects of a Research Associate who also happens to be a single mom will be furthered by this project. Outreach to elementary school children will occur in the form of boat trips on the Great Salt Lake to provide hands-on inquiry-based exploration in partnership with scientists to explore the roles of particulates of all kinds in the stratified waters of the lake, e.g. from photosynthesis to contaminant scavenging and sedimentation.