Pore-scale numerical analysis of fluid flows in compressed polyurethane foams with a workflow of open-cell foams modeling

IF 3.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Journal of Fluids and Structures Pub Date : 2024-01-18 DOI:10.1016/j.jfluidstructs.2023.104065

Alaa-Eddine Ennazii , A. Beaudoin , A. Fatu , P. Doumalin , J. Bouyer , P. Jolly , Y. Henry , E. Laçaj , B. Couderc

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引用次数: 0

Abstract

eX-Poro-HydroDynamic (XPHD) lubrication presents a different scientific approach to dealing with tribological problems. It is an innovative inter- and multidisciplinary research topic which offers a promising sliding solution for various applications, such as thrust bearings, various guide components and in terms of load capacity and damping. XPHD lubrication is a lubrication mechanism of biomimetic inspiration which features an additional parameter to the system “the porous media”. It consists of self-sustained fluid films generated within compressible porous layers imbibed with liquids in replacement for using the fluid film only as in the classic lubrication system. Soft and porous structures imbibed with liquids generate a high load support under compression. The load support is generated through the resistance to flow inside the porous material. During compression, the resistance to flow and load support increases the greater the compression rate. The main objective of this work is then to understand the behavior of the fluid flow inside the porous structures when subjected to axial compression stress. In the scientific literature, the works studying the flow in compressible materials are essentially experimental because of their very complex geometrical shape, the CFD (Computational Fluid Dynamics) simulations offer an economical solution to study the performance of this new concept of lubrication. To create the geometry, the morphological structures of foam samples are reconstructed at different levels of compression rates from 3D (Three Dimensional) X-ray microtomography. This is achieved by using the commercial software Avizo that allows to process 3D images and create 3D meshes suitable for numerical simulations. The numerical simulations of flows will be performed with the solver IcoFoam of the toolbox OpenFOAM for incompressible laminar flows, making it possible to study the pressure drop in these porous structures. The performed simulations were made with a polyurethane foam of 96% porosity using five compression rates for creating the different structures. The analysis of the numerical simulations shows the impact of the polyurethane foam compression on different key parameters such as the decrease in the permeability as function of the compression rate, the anisotropy of the flow within the compressible structure and the actual increase in the tortuosity generated by the compression of the foam and the variation of the porosity.

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利用开孔泡沫建模工作流程对压缩聚氨酯泡沫中的流体流动进行孔隙尺度数值分析

eX-Poro-HydroDynamic（XPHD）润滑技术为解决摩擦学问题提供了一种不同的科学方法。它是一个创新性的跨学科和多学科研究课题，为推力轴承、各种导轨部件等各种应用提供了有前途的滑动解决方案，并提高了承载能力和阻尼效果。XPHD 润滑是一种仿生物润滑机制，其特点是在系统中增加了一个参数 "多孔介质"。它包括在可压缩的多孔层中产生的自持流体膜，其中充满液体，以取代传统润滑系统中仅使用流体膜的做法。浸入液体的软质多孔结构在压缩时可产生高负荷支撑。载荷支撑是通过多孔材料内部的流动阻力产生的。在压缩过程中，压缩率越大，流动阻力和负载支撑力就越大。因此，这项工作的主要目的是了解多孔结构内部流体在受到轴向压缩应力时的流动行为。在科学文献中，由于可压缩材料的几何形状非常复杂，研究可压缩材料内流动的工作基本上都是实验性的，而 CFD（计算流体动力学）模拟为研究这种新概念润滑的性能提供了一种经济的解决方案。为了创建几何形状，我们通过三维 X 射线显微层析成像技术重建了泡沫样品在不同压缩率下的形态结构。这是通过使用商业软件 Avizo 实现的，该软件可以处理三维图像并创建适合数值模拟的三维网格。流动的数值模拟将使用用于不可压缩层流的工具箱 OpenFOAM 中的求解器 IcoFoam 进行，从而可以研究这些多孔结构中的压降。模拟使用了孔隙率为 96% 的聚氨酯泡沫，并使用五种压缩率来创建不同的结构。数值模拟分析表明了聚氨酯泡沫压缩对不同关键参数的影响，如渗透率随压缩率的变化而降低、可压缩结构内流动的各向异性、泡沫压缩产生的迂回度实际增加以及孔隙率的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Fluids and Structures 工程技术-工程：机械

CiteScore

6.90

自引率

8.30%

发文量

173

审稿时长

65 days

期刊介绍： The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.