Novel Applications of Viscoplastic Fluids: Creating New Products for the Pulp and Paper Sector

粘塑性流体的新应用：为纸浆和造纸行业创造新产品

• 批准号: RGPIN-2020-04319
• 负责人: Martinez, Mark
• 金额: $ 2.84万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=739884
• 关键词: Novel; Applications; Viscoplastic; Fluids; Creating

This proposal investigates a novel platform technology, i.e. hydrodynamic focusing coupled with reactive multi-fluid layering, to 3D print hollow hydrogel tubes. This technology is similar to the production of a spider's silk and our goal is to create an eco-friendly alternative to PVC tubing for extracorporeal circuits. Our immediate scientific need is to increase the fracture energy of these tubes by about 5-fold and we propose to do so by reinforcement with micro- or nano-fibrillated cellulose, i.e. building blocks of wood fibres. Literature reviews indicate that the fracture toughness increases dramatically by small additions of these reinforcing materials. Critically, the question we address is understanding of the relationship between orientation distribution of the reinforcement fibre to the end-use mechanical properties.      Our approach will blend computation and experimentation. We will estimate the orientation distribution using a probability density function that obeys a steady-state Fokker-Planck relationship. This approach is based on moment tensors of the fibre orientation probability distribution function, and crucially rely on accurate closure approximations that will be calibrated through experiment using x-ray micro-computed tomography. Experimentally, we will develop an inlet manifold to control orientation-distribution of the reinforcing fibres in the hydrogel tubing and demonstrate this on our lab-scale device.      The impact of the work will be two-fold. Scientifically, gaining insight into the macroscale and microscale physics of a dispersed fibrous phase under different flow conditions are significant steps forward in the fields of fluid mechanics and process engineering. On the numerical front, high-fidelity simulations of the interactions of the fibres with each other and with the background flow, that occur at the scale of fibres, are still rare in the literature. On the engineering side, if this process is shown to be feasible, parallelization is immediately available for industrial production. This will allow manufacturing of filaments, tubes or films from wood fibre raw material for future production of high-performance bio-composites as well as for textile production. A five-year project is proposed to be conducted by one post-doctoral fellow, two PhD students and 5 undergraduate assistants in either Chemical or Mechanical Engineering.

该提案研究了一种新颖的平台技术，即流体动力聚焦与反应性多流体分层相结合，以 3D 打印中空水凝胶管，该技术类似于蜘蛛丝的生产，我们的目标是创造一种 PVC 的环保替代品。我们迫切的科学需求是将这些管的断裂能提高约 5 倍，我们建议通过微米或纳米原纤化纤维素进行加固来实现这一目标，文献综述表明，少量添加这些增强材料可以显着提高断裂韧性，关键是我们要解决的问题是了解增强纤维的取向分布与最终使用机械性能之间的关系。我们的方法将混合计算和实验。我们将使用服从稳态福克-普朗克关系的概率密度函数来估计取向分布。该方法基于纤维取向概率分布的矩张量。函数，并且关键依赖于精确的闭合近似值，该近似值将通过使用 X 射线微计算机断层扫描的实验进行校准。实验上，我们将开发一种入口歧管来控制水凝胶管中增强纤维的方向分布，并在我们的实验中进行演示。实验室规模的设备将在科学上产生双重影响，深入了解不同流动条件下分散纤维相的宏观和微观物理现象。这是流体力学和过程工程领域向前迈出的重要一步，在纤维尺度上对纤维彼此之间以及与背景流动的相互作用进行高保真模拟仍然很少见。在工程方面，如果该工艺被证明是可行的，则可以立即进行工业生产，这将允许用木纤维原材料制造长丝、管材或薄膜，以用于未来生产高性能生物复合材料。以及用于纺织一个为期五年的项目拟由一名化学或机械工程博士后研究员、两名博士生和五名本科生助理进行。