Method to characterize the air flow and water removal characteristics during vacuum dewatering. Part II - Analysis and characterization

J. Pujara, M. A. Siddiqui, Z. Liu, P. Bjegovic, S. S. Takagaki, P. Y. Li, S. Ramaswamy

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This is part II of a study reported earlier on a method to characterize the air flow and water removal characteristics during vacuum dewatering. This article presents experimental data and analysis of results from the use of a cyclically actuated vacuum dewatering device for removing moisture from wetted porous materials such as paper with the intermittent application of vacuum and accompanying air flow though the material. Results presented include sheet moisture content as a function of residence time and hence water removal rate under a variety of process conditions. Also, experimental results on air flow through the wet porous structure and hence the role and importance of air flow during vacuum dewatering are presented. Vacuum dewatering process conditions include exit solids content between 11 and 20% solid under applied vacuum conditions of 13.5 to 67.7 kPa (4 to 20 in. Hg). Regression analysis indicated that the exit sheet moisture content exhibited a nonlinear relationship with residence time with exit solids reaching a plateau after a certain residence time. Final moisture content correlated linearly with the average overall flow rate of air through the paper sample and the basis weight of the material.

Original languageEnglish (US)
Pages (from-to)341-348
Number of pages8
JournalDrying Technology
Volume26
Issue number3
DOIs
StatePublished - 2008

Bibliographical note

Funding Information:
The authors thank the National Science Foundation (NSF/DMI 0085230) for research funding. Special thanks to Dr. Gary Worry for help and funding support.

Keywords

  • Characterization
  • Flow measurement
  • Mass transfer
  • Paper manufacture
  • Porous materials
  • Pressure measurement
  • Rotating disc device
  • Vacuum dewatering
  • Water removal

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