PAPER PHYSICS. PIV measurements of flow through forming fabrics
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Haiya Peng
Abstract
The three-dimensional velocity field in the single phase approach flow to a multiple layer woven forming fabric was measured using PIV. The measurements were conducted on a scaled-up model of a forming fabric in a water/glycerin flow loop. Each strand on the paper side of the model forming fabric had a filament diameter ( d) of 1 5 mm, and the flow loop test section was 3 1 0 mm squared, permitting the measurement of detailed velocity distributions over multiple strands of the fabric. The flow speed in the loop test section was varied to achieve screen Reynolds numbers between 12 and 6 5 . PIV measurements showed that when the distance t o the paper side of the fabric changes from 0.25d to 1 . 5d, the normalized ZD, CMD and MD velocity deviation decreases from 1 9 .7% to 4 .2%, 1 5 . 3 % to 1 .9% and 1 4 . 5 % t o 2 . 3 %, respectively; the ratio between maximum and minimum ZD velocity decreases from 3 .3 to 1 .2 . These findings indicate that the flow non-uniformity caused by the fabric weave is confined to a short distance above the fabric. CFD simulations of the same flow were consistent with the PIV measurements.
© 2018 by Walter de Gruyter Berlin/Boston
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- BIOREFINERY. Pressurised hot water extraction of acetylated xylan from birch sawdust
- BIOREFINERY. Nanocellulose characterization with mechanical fractionation
- MECHANICAL PULPING.Analysis method of high-consistency chip refiner forces
- MECHANICAL PULPING.Effect of long fibre concentration on low consistency refining of mechanical pulp
- CHEMICAL PULPING. Oxidative degradation of AOX in softwood-based kraft mill effluents from E C F bleachin g
- COATING. lnfluence of the distribution of the shape and size distribution of pigment particles on cracking in coating layers during creasin
- PRINTING.Natural zeolite as filler in base ink jet paper sheet
- PRINTING.Paper and printer effects on xerographic print quality
- PRINTING. The ageing resistance of offset and electrophotographic prints
- PAPER INK INTERACTIONS. The effect of coating pore structure and geometry on the drying efficiency of heatset web-offset ink solvent
- PAPER INK INTERACTIONS. Impact of oil-binder interaction on pore structure in paper coating as studied by internal reflectance Part 1 : implications of pore volume loss for print drying
- PAPER INK INTERACTIONS .Impact of oil-binder interaction on pore structure in paper coatings as studied by internal reflectance. Part 2: Relation to structural expansion
- PAPER PHYSICS. Bi-level optimization in papermaking process design
- PAPER PHYSICS. PIV measurements of flow through forming fabrics
- PAPER PHYSICS .The effect of newsprint furnish composition and sheet structure on wet pressing efficiency
- PAPER PHYSICS. The web structure in relation to the furnish composition and shoe press pulse profiles during wet pressing
- PAPER PHYSICS. Analytical Prediction of Package Collapse Loads-Basic considerations
- PAPER PHYSICS. Paper-based device for pre-concentration of target analytes
Articles in the same Issue
- Contents
- BIOREFINERY. Pressurised hot water extraction of acetylated xylan from birch sawdust
- BIOREFINERY. Nanocellulose characterization with mechanical fractionation
- MECHANICAL PULPING.Analysis method of high-consistency chip refiner forces
- MECHANICAL PULPING.Effect of long fibre concentration on low consistency refining of mechanical pulp
- CHEMICAL PULPING. Oxidative degradation of AOX in softwood-based kraft mill effluents from E C F bleachin g
- COATING. lnfluence of the distribution of the shape and size distribution of pigment particles on cracking in coating layers during creasin
- PRINTING.Natural zeolite as filler in base ink jet paper sheet
- PRINTING.Paper and printer effects on xerographic print quality
- PRINTING. The ageing resistance of offset and electrophotographic prints
- PAPER INK INTERACTIONS. The effect of coating pore structure and geometry on the drying efficiency of heatset web-offset ink solvent
- PAPER INK INTERACTIONS. Impact of oil-binder interaction on pore structure in paper coating as studied by internal reflectance Part 1 : implications of pore volume loss for print drying
- PAPER INK INTERACTIONS .Impact of oil-binder interaction on pore structure in paper coatings as studied by internal reflectance. Part 2: Relation to structural expansion
- PAPER PHYSICS. Bi-level optimization in papermaking process design
- PAPER PHYSICS. PIV measurements of flow through forming fabrics
- PAPER PHYSICS .The effect of newsprint furnish composition and sheet structure on wet pressing efficiency
- PAPER PHYSICS. The web structure in relation to the furnish composition and shoe press pulse profiles during wet pressing
- PAPER PHYSICS. Analytical Prediction of Package Collapse Loads-Basic considerations
- PAPER PHYSICS. Paper-based device for pre-concentration of target analytes
