Cryogenic Electrorheological Fluids

w：\awards\awards96\*.doc 9622525 Tao 本计画将研究一种新的材料，低温电流变液。该研究将确定有效的 粘度，剪切应力，响应 时间， 柱的形成和这些流体的结构。 该计划将研究场致凝固的动态过程，并探索由超导颗粒制成的低温电流变液的电和磁流变特性。实验和并行理论研究的目的是解决基础科学的电流变液：物理机制和流变 和电学性能 儿 流体. 如果成功的话，这些结果将成为采用低温ER材料的新技术的基础。 电流变（ER）流体通常是 提述 到 智能流体：它们的流变特性可以通过电场迅速改变。因此，ER流体具有广泛的应用，例如减震器、悬架系统和离合器。本计画将研究由悬浮在液态氮或液态氦中的电介质微粒（包括超导微粒）所组成的低温电流变液。 本研究将确定低温电流变液的物理和机械性能以及动态结构的形成。 低温电流变液与电流变液的比较 在 室温将提供显著的 关于ER效应的基本物理学的新信息。 此外，该项目可能为基于电流变现象的低温技术奠定基础，并导致在流体工程中的实际应用。 ***

w:\awards\awards96\*.doc 9622525 Tao This project will investigate a new class of materials, cryogenic electrorheological (ER) fluids. The research will determine the effective viscosity, shear stress, response time, column formation, and structure of these fluids. The program will examine the dynamic process of field-induced solidification an explore electro- and magneto-rheological properties of cryogenic ER fluids made of superconducting particles. The experimental and concurrent theoretical investigation is aimed at addressing fundamental science of ER fluids: the physical mechanisms and rheological and electrical properties of ER fluids. If successful, the results will form the basis for new technology employing cryogenic ER materials. %%% Electrorheological (ER) fluids are often referred to as intelligent fluids: Their rheological properties can be rapidly changed by an electric field. Hence, ER fluids have a wide variety of applications, such as shock absorbers, suspension systems, and clutches. This project will investigate cryogenic ER fluids which consist of fine dielectric particles, including superconducting particles, suspended in liquid nitrogen or liquid helium. The research will determine physical and a mechanical properties of the cryogenic ER fluids and dynamic structure formation. The comparison between cryogenic ER fluids and ER fluids at room temperature will provide significant new information about the fundamental physics of the ER effect. Moreover, the project may potentially establish the foundation for a low temperature technology based on ER phenomena and lead to practical applications in fluids engineering. ***