Simulation of Water Removal in Paper Based on a 2D Level-Set Model Coupled with Volume Forces Representing Fluid Resistance in 3D Fiber Distribution

Rezk, Kamal; Nilsson, Lennart; Forsberg, Jan; Berghel, Jonas

doi:10.1080/07373937.2014.967401

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Developed a numerical model of vacuum dewatering as a twophase flow in porous media simulation in two dimensions using a 3D model of the paper sheet. Rezk et al 2015 Creation and validation of a mathematical model based on the fiber properties, fiber width and fiber length, and density, which predict vacuum dewatering.…”

Section: Nilsson 2014bmentioning

confidence: 99%

Method for studying water removal and air penetration during through air drying of tissue in laboratory scale

Sjöstrand

Danielsson

Lestelius

2023

BioRes

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Energy use, together with consumption of raw materials, machine clothing, and wet end chemicals, are some of the most critical aspects in successful tissue making today. This work was aimed at developing a laboratory-scale method of estimating dewatering mechanisms, vacuum efficiency, and energy use of Through Air Drying (TAD) of tissue. When compared to pilot data, the results of the new laboratory method for investigating dewatering during TAD were in the same magnitude, around 24 to 26% dryness after vacuum dewatering, and 27 to 29% dryness after TAD molding. Sheet properties, such as caliper and surface profile, were evaluated and compared to commercial tissue sheets. The results indicate that it will be possible to precisely measure accurate dryness development and penetrated air volume for tissue sheet forming and TAD molding at a laboratory scale. This can contribute to the efforts of implementing a circular forest-based bioeconomy by increasing the fundamental understanding of dewatering of tissue paper materials, which is facilitated by improvements in energy use. The new method developed in this work will make it easier to assess ideas that are difficult to bring to pilot scale or full scale before learning more of the dewatering capabilities. The authors are convinced that improved knowledge of tissue dewatering mechanisms, forming, and material transport during and after TAD dewatering can increase the efficiency of the industrial manufacturing processes.

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Section: Nilsson 2014bmentioning

confidence: 99%

Method for studying water removal and air penetration during through air drying of tissue in laboratory scale

Sjöstrand

Danielsson

Lestelius

2023

BioRes

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“…The predictions and experimental values agreed regarding air flow, but the predicted dewatering rate was twice as high as the experimental. Rezk et al [8] concluded that the fabric structure was best described by using a combination of solid fabric yarns and flow resistance compared with only using flow resistance as in the earlier work. With this new description of the forming fabric, the dewatering rates were in better agreement with experimental data.…”

Section: Introductionmentioning

confidence: 94%

Numerical model of water removal and air penetration during vacuum dewatering

Sjöstrand

Nilsson

Ullsten³

et al. 2020

Drying Technology

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Dewatering and air flow in high vacuum suction boxes was examined. The work was mainly numerical and was based on, and compared with, previously published experimental results of vacuum dewatering from laboratory equipment and from a pilot paper machine. A previously published numerical model for wet pressing is used as the basis for this work. The aims of this study were to find new fitting parameters that allows the previous model to be used for vacuum dewatering instead of pressing, and to examine two extensions to the original model. The results indicate that the new vacuum dewatering model for moisture can predict the dewatering behavior for several different experimental data series both from laboratory equipment and a pilot paper machine using the same set of fitting parameters. Two different numerical models for air flow through the paper sheet, during vacuum dewatering, were developed based on postulating that the decrease in moisture permeability is accompanied by a simultaneous increase in air permeability. The models for air flow can also be fitted to experimental data and predict the magnitudes of air flow during vacuum dewatering. The data sets for air flow exhibit a certain degree of operator dependence though, so that one set of fitting parameters is not enough for obtaining good agreement with all data sets.

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Modeling the influence of forming fabric structure on vacuum box dewatering

Sjöstrand¹,

Barbier²,

Nilsson³

2017

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This investigation used numerical models to describe forming section sheet dewatering at the high vacuum suction boxes. Three different fabric structures were examined with numerical models for single-phase flow of air and for two-phase flow of air and water. This was done to evaluate how forming fabric structure influences sheet dewatering. The numerical models were compared with an experimental study of the same fabrics investigated on a laboratory suction box. The small differences in dewatering rate in the experimental study could be simulated with the models, which confirmed the validity of the models. This implies that these numerical models can be used to describe new fabrics and how they will respond in the papermaking process.

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Simulation of Water Removal in Paper Based on a 2D Level-Set Model Coupled with Volume Forces Representing Fluid Resistance in 3D Fiber Distribution

Cited by 3 publications

References 24 publications

Method for studying water removal and air penetration during through air drying of tissue in laboratory scale

Method for studying water removal and air penetration during through air drying of tissue in laboratory scale

Numerical model of water removal and air penetration during vacuum dewatering

Modeling the influence of forming fabric structure on vacuum box dewatering

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