Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (12): 37-41.

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Flow Properties and Energy Dissipation of Medium-Consistency Pulp in Shear Condition

Chen Qi-feng  Chen Ke-fu  ya Ren-dang  Li Jun   

  1. State Key Laboratory of Pulp and Paper Engineering,South China Univ.of Tech.,Guangzhou 510640,Guandong,China
  • Received:2004-08-08 Online:2005-12-25 Published:2005-12-25
  • Contact: Chen Qi·feng(born in 1976)，male，lecturer，Ph．D．，mainly researches on medium—consistency pulpingtechnology and equipment E-mail:qfchen@ scut.edu.ca
  • About author:Chen Qi·feng(born in 1976)，male，lecturer，Ph．D．，mainly researches on medium—consistency pulpingtechnology and equipment

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Abstract:

This paper studies the flow properties and energy dissipation of medium-consistency(MC)pulp SUS-pension in rotary device.The results indicate that(1)MC pulp suspension is of similar flow properties to waterwhen it displays fluid·like behavior(fluidization)in rotary device under high shear stress;(2)the energy dis-sipation of MC pulp suspension can be estimated by the temperature change during the fluidization;(3)be-cause of the large friction among fibres,the energy dissipation occupies a high ratio to the input energy duringthe fluidization,being disadvantageous to the pumping of MC pulp suspension;and(4)the apparent viscosityof the pulp suspension with a mass fraction of 13.2% is 7.94 Pa·s.and the corresponding energy dissipation
is 498.96 kW/m,which is 45.62% of the input energy and increases with the mass fraction of the suspension.

Key words: medium-consistency pulp suspension, flow property, energy dissipation, apparent viscosity, shear stress