RUI: Reaction Fronts in Fluid Flows -- Pinning, Lobes and Flights

* 非技术性摘要 * 在森林火灾中，被烧毁和未被烧毁的树木之间的分界线被称为前线。 这条战线的运动决定了火势如何在森林中蔓延。 类似的前沿动力学表征了疾病在社会中的传播，以及许多化学处理应用，细胞和发育中的胚胎中的生物过程，以及聚变反应堆中的等离子体。 这项资助支持的实验将探索锋面的运动如何受到流体混合的影响，例如，化学处理器中的强制流动，森林火灾中的风，或疾病传播时社会中的人的运动。 桌面实验使用一个简单的化学反应将集中在锋面如何受到简单的流动模式-涡流（涡流池）和射流的影响。 如果成功，这项研究将有助于我们理解跨越科学和工程领域的广泛系统中的前沿行为，最终为描述流动系统中前沿的一般理论奠定基础。 所有的研究都将与本科生一起完成，他们将参与该项目的各个方面，包括实验设计，设备的建造和测试，数据采集和分析，以及结果的出版和展示。 这将是这些学生第一次真实的研究经历，并将在他们作为科学家的发展中发挥重要作用。技术摘要 * 该基金将支持研究流体流动对反应前沿传播影响的实验和模拟。 这是一个适用于跨越所有科学和工程领域的广泛前沿生产系统的问题。 这些研究将审查锋面传播的普遍特征，特别是封闭和开放的流动结构（涡流和射流区域）对锋面传播过程的重要性。 由这笔赠款资助的桌面实验将使用Belousov-Zhabotinsky（BZ）化学反应的变体，通常被认为是前沿生产和模式形成系统的范例。 流动将产生磁流体动力学技术，可以产生有序和无序模式的漩涡和波浪射流。 这项研究的目标是分离流动反应动力学中的基本过程，这些过程可以形成流动系统中前沿传播的一般理论的发展基础。 所有的研究都将与本科生一起完成，他们将参与研究的各个方面，包括实验设计，仪器的建造和测试，数据采集和分析，以及结果的出版和展示。 这将是这些学生第一次真实的研究经历，并将在他们作为科学家的发展中发挥重要作用。

****NON-TECHNICAL ABSTRACT****In a forest fire, the dividing line between burned and unburned trees is called a front. The motion of this front determines how the fire spreads through the forest. Similar front dynamics characterize the spreading of a disease in society, as well as numerous chemical processing applications, biological processes in cells and developing embryos, and plasmas in fusion reactors. The experiments supported by this grant will explore how the motion of fronts is affected by fluid mixing, e.g., forced flows in a chemical processor, winds in a forest fire, or the motion of people in society while a disease spreads. Table-top experiments using a simple chemical reaction will focus on how fronts are affected by simple flow patterns -- vortices (whirlpools) and jets. If successful, this research will help our understanding of front behavior in a wide range of systems spanning the fields of science and engineering, ultimately laying the foundation for a general theory to describe fronts in flowing systems. All of the research will be done in conjunction with undergraduate students who will participate in all aspects of the project including experimental design, construction and testing of the apparatus, data-taking and analysis, and publication and presentation of the results. These will be the first real research experiences for these students, and will play an important role in their development as scientists.**** TECHNICAL ABSTRACT****This grant will support experiments and simulations that study the effects of fluid flows on the propagation of reaction fronts. This is an issue that is applicable to a wide range of front-producing systems spanning all fields of science and engineering. The studies will examine universal features of front propagation, particularly the importance of closed and open flow structures (vortices and jet regions) on the front-propagation process. The table-top experiments funded by this grant will use variations of the Belousov-Zhabotinsky (BZ) chemical reaction, often considered to be a paradigm for front-producing and pattern forming systems. The flows will be generated with magnetohydrodynamic techniques that can produce ordered and disordered patterns of vortices and wavy jets. The goal of the research is to isolate fundamental processes in flow-reaction dynamics that could form the basis for the development of a general theory of front propagation in flowing systems. All of the research will be done in conjunction with undergraduate students who will participate in all aspects of the research including experimental design, construction and testing of the apparatus, data-taking and analysis, and publication and presentation of the results. These will be the first real research experiences for these students, and will play an important role in their development as scientists.