Rheology of dense particulate suspensions

CBET -1640589 PI：Del Gado，Emanuela致密颗粒悬浮液的流变性是水泥和浆体、钻井和回收、个人护理和化学产品、浆料和粉末工业技术核心的战略主题。在缓慢的强制下，稠密的悬浮液可以相对容易地流动，而快速的强制可能导致流动的突然变稠和停滞，对材料加工和制造产生巨大的后果。欧洲和美国研究人员的新发现最近对这些现象的公认范式提出了挑战，2015年6月在爱丁堡举行的一个小型研讨会为这些问题的辩论提供了第一个场所。为了让更多的美国科学家参与进来，保持这个快速发展的领域的势头，该项目将支持在华盛顿举行的一个新的研讨会。这是一个利用爱丁堡会议中开始出现的新颖想法和社区的有利时机，为美国研究人员提供了一个独特的机会，以领导对技术影响的深入讨论和分析。该项目将支持学生和年轻教师参加，他们将有一个独特的机会参与这一重要科学和工程领域的最新发展。关于“稠密颗粒悬浮液流变学”的研讨会将于2016年6月16日至17日在乔治敦大学举行，并将为不同背景的研究人员提供更长的讨论和交流时间。该项目要求提供资金，以支持6名初出茅庐的科学家和5名女科学家，他们的旅费预算有限，否则无法出席会议。将在研讨会期间提出和分析的研究将具有核心的基本理解，即DST现象的强非线性响应如何从胶体和颗粒系统中的简单组分中出现，与经典的临界现象，特别是干扰类似。流动性质转变，很像材料物理学中的经典相行为，具有巨大的实际意义，因为它们决定了工程背景下材料的加工条件。揭示不连续剪切增稠（DST）现象的起源，并根据特定的流动条件表征其前体，对于控制先进制造应用中的颗粒流动、相互作用和组装至关重要。这是一种新的物理学，它是局部性质（应力、变形率......）在夏令时开始前检测到的吗在此背景下，与会者将讨论新的理论，先进的计算方法和新的实验技术，可以是变革性的。

CBET - 1640589PI: Del Gado, EmanuelaThe rheology of dense particle suspensions is a strategic theme at the core of industrial technologies for cements and pastes, drilling and recovery, personal care and chemical products, slurry and powders. Dense suspensions may flow with relative ease under slow forcing, while fast forcing can cause an abrupt thickening and arrest of the flow with dramatic consequences for material processing and manufacturing. New findings from European and US researchers have recently challenged the accepted paradigm for these phenomena, and a first venue for the debate on these issues was offered by a small workshop held in Edinburgh in June 2015. With the intent of involving more US scientists, keeping the momentum going in this rapidly evolving field, this project will support a new workshop to be held in Washington DC. This is an opportune time to capitalize on the novel ideas and the community that started to emerge in the Edinburgh meeting, providing a unique opportunity to the US researchers to lead an in-depth discussion and analysis of the implications for technology. The project will support attendance by students and young faculty who will have a unique opportunity to participate in the latest developments in this important area of science and engineering.The workshop on "Rheology of Dense Particulate Suspensions" will be held on June 16 -17, 2016, at Georgetown University and will provide extended times for discussion and networking to researchers with diverse backgrounds. This project requests funds to support 6 early career scientists and 5 women scientists that have limited travel budget and could not otherwise attend the meeting. The research that will be presented and analysed during the workshop will have, at the core, the fundamental understanding of how the strongly non-linear response of DST phenomena may emerge from the simple components in colloidal and granular systems, in analogy with classical critical phenomena and in particular with jamming. Flow property transitions, much like classical phase behavior in material physics, have enormous practical relevance, as they determine the processing conditions for a material in engineering contexts. Unraveling the origin of discontinuous shear thickening (DST) phenomena, characterizing their precursors also with respect to specific flow conditions, is crucial to control particle flow, interactions and assembly for advanced manufacturing applications. Which is the new physics that underlies the large fluctuations in local properties (stresses, deformation rates...) detected prior the onset of DST? Within this context participants will discuss new theories, advanced computational approaches and novel experimental techniques that can be transformative.