糊料挤出形成表面润滑层
Paste extrusion generates a surface lubrication layer
AI总结：
研究高压糊料挤出中颗粒-流体混合物与壁面的作用，发现压力诱导相分离会生成薄于颗粒尺寸的流体润滑层，并可借此调节摩擦系数、降低能耗及改善产品失效。
摘要：
稠密颗粒-流体混合物（即糊料）广泛存在于动物饲料、人类食品、药品以及生物能源用生物质等多种材料的生产过程中。由于外加应力、颗粒可变形性和间隙流体之间的相互作用极为复杂，人们对这种稠密可变形颗粒介质的流动行为仍认识不足。挤出过程中的高压管道流动便是一个颇具挑战的场景。尽管该技术应用广泛，但在糊料高压流动期间，颗粒-流体混合物如何表现并与边界相互作用，仍存在许多未解问题。我们展示了高压糊料挤出如何诱导形成一层比颗粒尺寸更薄的流体边界层。该诱导流体层源于压力引起的相分离过程。流体层足够薄，能够影响颗粒与壁面的接触，从而使糊料的摩擦系数可调。因此，我们的结果为降低能耗，乃至调控挤出产品的组成和失效提供了潜在途径。
英文摘要：
Dense particle-fluid mixtures, or \emph{pastes}, are encountered in the production of various materials, including animal feed, human food, pharmaceuticals, and biomass for bioenergy. The flow behavior of such dense deformable particulate media is poorly understood, as the interplay between applied stresses, particle deformability and interstitial fluids can be very complex. One challenging context is high pressure pipe flow, encountered in extrusion. Despite its widespread use, many questions remain about how during high pressure flow of the paste, the particle-fluid mixture behaves and interacts with boundaries. We show how high pressure paste extrusion induces the formation of a fluid boundary thinner than the particle size. The induced fluid layer emerges from a pressure-induced phase segregation process. The fluid layer is sufficiently thin to affect particle-wall contacts, making the paste friction coefficient tunable. Our results so offer potential pathways for reducing energy consumption and even extrusion product composition and failure.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
