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Modelling of an aerodynamic technique of forming web structures in textile industries: I. Turbulent air flow past filters

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image of Mathematical Engineering in Industry

In this study we develop a fundamental understanding of the dynamics of an aerodynamic method of forming fibrous web structures from short fibres. Computational fluid dynamics (CFD) is employed to model the web forming process which consists of fibre transportation through a turbulent air flow between two filters: a perforated screen of low resistance, which the fibres penetrate, and a belt of large resistance, onto which the fibres are deposited. In this first paper the fluid dynamics inside the machine used to form the web is analysed using a mathematical model which consists of a combination of the k-ε turbulence model and the Darcy law on the two filters. Numerical results using a control volume finite-difference method are obtained for various machine geometries, filter resistances and inlet boundary conditions, in order to identify the important flow parameters. The fibre dynamics through the turbulent air flows presented here will be investigated in a subsequent paper.


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