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- W2271304768 abstract "The evolution of paper machines in order to get better paper grades at faster production rates imposed paper mills to operate more complex systems and gain in precision. The hydraulic injector which delivers the pulp onto a paper fabric, commonly called headbox, has not escaped from this evolution. In this work a detailed analysis and simulation of each part of a headbox was made. From these simulations and whenever possible from experimental observations and measurements, some basic questions were tried to be answered, like the need of each part in a modern papermaking operation. Two different approaches were chosen, firstly a hydrodynamical study of the pulp flowing inside the different parts, focusing especially on turbulence scales and intensities and, secondly, the reaction of this pulp to the applied energy. It was observed that water can be used to reasonably predict the behaviour of a weak consistency pulp suspension for most of the important design parameters. The geometrical parameters of a headbox were also studied in order to provide alternative methods for jet control. Indeed the jet geometrical characteristics are important variables for paper production. Most of the time miscalculated by old methods, no modern solutions were proposed to get a detailed jet angle and contraction coefficient. We have shown in this work that a detailed solution for any nozzle geometry can be computed. The location of the vena contracta is also possible with the proposed method. It was also shown that the real nozzle geometry used normally in a modern headbox with a double convergent configuration, may considerably modify the jet angle." @default.
- W2271304768 created "2016-06-24" @default.
- W2271304768 creator A5050141591 @default.
- W2271304768 date "2008-06-20" @default.
- W2271304768 modified "2023-09-23" @default.
- W2271304768 title "Experimental study and computational simulation of fibre suspension flows - Application to headboxes" @default.
- W2271304768 hasPublicationYear "2008" @default.
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