Influence of machine-side filaments and jet-to-wire speed ratio on the flow through of a forming fabric
Source abstract
Abstract
In the forming section of a paper machine, pulp is spread over a moving fabric and water is drained through the fabric. The fibers left behind form a wet sheet. The mechanical dewatering that begins in the forming section is important to the final paper quality because any non-uniformities arising in this section cannot be corrected later in the paper machine. Therefore, understanding the flow field through the forming section provides insight into the finished paper. We analyzed the effect of the machine-side filaments of the fabric on the flow field upstream of the paper-side filaments. The resistance of a multilayer fabric was found to be nearly equal to the sum of the resistances of each layer considered in isolation. For the particular fabric, the machine-side layer produced up to a 10% effect on the velocity above the paper-side layer. For the effect of jet-to-wire speed ratio on the flow, an angled approach flow to the fabric produced very little change in the average flow perpendicular to the fabric (i.e., little change in fabric permeability). However, it has a marked effect on the machine-direction shear stress in the vicinity of the paper-side filaments. This shear stress drives the fiber orientation characteristics of so-called rush or drag jet impingement.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Lattice Boltzmann Simulation Studies · Textile materials and evaluations · Fluid Dynamics and Heat Transfer
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
Show source-provided references
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