During vacuum dewatering on paper machines, the wet fibre mat is subjected to high frequency suction pulses. These pulses result in the wet fibre mat compressing as well as water being displaced from the pores with air. Laboratory results have indicated that the suction pulse length and suction pulse frequency can have a significant effect on the final solids content after application of suction. In order to understand the process occurring during vacuum dewatering a one-dimensional two-phase flow model was developed. The effect of process variables and wet fibre mat properties has been investigated.
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|Published - 1 Nov 2003