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research-article

Experimental Study and Computational Fluid Dynamics Modelling of Pulp Suspensions Flow in a Pipe

[+] Author and Article Information
Carla Cotas

Chemical Engineering and Forest Products Research Centre (CIEPQPF) University of Coimbra
carlacotas@gmail.com

Bruno Branco

Electrical and Computers Engineering Department University of Coimbra
bmbranco@gmail.com

Dariusz Asendrych

Częstochowa University of Technology Institute of Thermal Machinery
darek@imc.pcz.pl

Fernando Garcia

Chemical Engineering and Forest Products Research Centre (CIEPQPF) University of Coimbra
fgarcia@eq.uc.pt

Pedro Faia

Electrical and Computers Engineering Department University of Coimbra
faia@deec.uc.pt

Maria Graça Rasteiro

Chemical Engineering and Forest Products Research Centre (CIEPQPF) University of Coimbra
mgr@eq.uc.pt

1Corresponding author.

ASME doi:10.1115/1.4036165 History: Received July 25, 2016; Revised February 14, 2017

Abstract

Eucalyptus and Pine suspensions flow in a pipe was studied experimentally and numerically. Pressure drop was measured for different mean inlet flow velocities. Electrical Impedance Tomography, EIT, was used to evaluate the prevailing flow regime. Fibres concentration distribution in the pipe cross-section and plug evolution were inferred from EIT tomographic images. A modified low-Reynolds-number k-? turbulence model was applied to simulate the flow of pulp suspensions. The accuracy of the CFD predictions was significantly reduced when data in plug regime was simulated. The CFD model applied was initially developed to simulate the flow of Eucalyptus and Pine suspensions in fully turbulent flow regime. Using this model to simulate data in the plug regime leads to an excessive attenuation of turbulence which leads to lower values of pressure drop than the experimental ones. For transition flow regime, the CFD model could be applied successfully to simulate the flow data, similar to what happens for the turbulent regime.

Copyright (c) 2017 by ASME
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