CIESC Journal ›› 2023, Vol. 74 ›› Issue (5): 1928-1938.DOI: 10.11949/0438-1157.20230238

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Pore scale numerical simulations for wicking performance of metallic woven mesh

Xiaoyu JIA1(), Jian YANG2, Bo WANG2, Mei LIN1(), Qiuwang WANG2   

  1. 1.Department of Fluid Machinery, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
    2.MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
  • Received:2023-03-14 Revised:2023-04-25 Online:2023-06-29 Published:2023-05-05
  • Contact: Mei LIN

金属丝网毛细特性的孔隙尺度数值分析

贾晓宇1(), 杨剑2, 王博2, 林梅1(), 王秋旺2   

  1. 1.西安交通大学能源与动力工程学院流体机械与工程系,陕西 西安 710049
    2.西安交通大学热流科学与 工程教育部重点实验室,陕西 西安 710049
  • 通讯作者: 林梅
  • 作者简介:贾晓宇(1997—),男,博士研究生,1393317957@qq.com
  • 基金资助:
    国家自然科学基金项目(52076169)

Abstract:

Metallic woven meshes have received considerable attention in several engineering applications as filtration, catalysis, heat transfer enhancement and explosion suppression owing to their merits of controllable pore structure, high specific surface area, high mechanical strength and low price. In order to characterize their capillary performance, firstly, the detailed geometrical dimensions of four kinds of square-shaped plain weave wire screen with different mesh numbers were measured. Then a numerical model was developed to evaluate the fluid dynamics of a porous woven mesh at the pore scale. Finally, based on the pore scale numerical results, the effects of wire diameter and mesh number on porosity, specific surface area and permeability were analyzed. The study found that the Kozeny-Carman formula can better predict the permeability relationship of wire mesh at low flow rates (less than 0.01 m/s), and the geometric factor has a logarithmic relationship with the mesh diameter. While at high flow rates (larger than 0.01 m/s), the flow regime transition from Darcy to Forchheimer, the inertial contribution can not be neglected. The Darcy and non-Darcy permeability coefficient can be obtained by Forchheimer correlation, and the relationship between permeability and porosity and wire diameter is modified according to Kozeny-like model. The obtained fitting formulae between geometric structure and capillary performance of plain woven wire mesh provide a design guideline for the metallic woven mesh used for wicking and transpiration cooling.

Key words: metallic woven mesh, porous media, pore scale, permeability, wicking performance, laminar flow

摘要:

金属丝网多孔材料由于其孔隙可控、高比表面积、高强度和价格低廉的特点,在过滤、催化、高效换热以及防爆领域引起广泛关注。为表征其毛细特性,测量了四种不同规格的铜丝网几何尺寸,并建立了平纹方形编织金属丝网的单元孔隙结构模型。分析了丝径、孔径对孔隙率、比表面积、渗透率的影响。研究发现:Kozeny-Carman公式可以较好预测低流速(小于0.01 m/s)下的金属丝网渗透率关系,其中几何因子与丝网网径成对数关系。流速大于0.01 m/s时,惯性效应的影响不能忽略,通过Forchheimer公式得到Darcy渗透系数和非Darcy渗透系数,并根据类Kozeny模型修正了渗透系数与孔隙率和丝径的关系。研究得到了平纹编织丝网几何结构与毛细特性的拟合关系,为吸液蒸发用金属丝网提供了设计依据。

关键词: 金属丝网, 多孔介质, 孔隙尺度, 渗透率, 毛细特性, 层流

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