Numerical simulation of fiber slurry flow field in the internal forward cleaner

doi:10.3969/j.issn.1000-2006.2013.02.025

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2013, Vol. 37 ›› Issue (02): 141-146.doi: 10.3969/j.issn.1000-2006.2013.02.025

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Numerical simulation of fiber slurry flow field in the internal forward cleaner

ZHANG Jian, CHEN Yongli, WANG Chen, ZHANG Hui^*

Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China

Online:2013-04-18 Published:2013-04-18

Abstract

Abstract: Based on the FLUENT software, the 3% concentration of pulp suspension flow field was obtained with the Reynolds stress model(RSM). Meanwhile, the motion trail and separation efficiency of pulp impurities were obtained with the coupling of the alternate with discrete phase model. The results of simulation show that there is slightly asymmetric in the internal flow field of forward cleaner. The largest pressure drop of total pressure is about 4 500 Pa from the wall to the central axis of forward cleaner. The axial velocity profile at any section of forward cleaner is composed of two regions, including an internal vortex in the central region and an external vortex in the outer region. The separation efficiency for heavy and light impurities with the particles diameter of 0.02 mm are all maintained at about 50%, when the particles diameter is more than 0.2 mm, separation efficiency of heavy impurities will increase along with the particle diameter increasing, which of light impurities will decrease along with particle diameter increase. When the particles diameter is close to 1mm, the separation efficiency of the particles which the relative densities are greater than or equal to the stones has reached 100%.

CLC Number:

ZHANG Jian, CHEN Yongli, WANG Chen, ZHANG Hui. Numerical simulation of fiber slurry flow field in the internal forward cleaner[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2013, 37(02): 141-146.

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Numerical simulation of fiber slurry flow field in the internal forward cleaner

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