Flow characteristics and circular pipe flow of pulp-suspension.

Ogawa, Kohei; Yoshikawa, Shiro; Suguro, Akira; Ikeda, Jun; Ogawa, Hirohisa

doi:10.1252/jcej.23.1

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…This could also be seen when studying the velocity profile for these two cases, since the maximum velocity obtained in these profiles is much lower than the bulk velocity. The increase in viscosity when the consistency is increased was also observed by Ogawa et al (1990).…”

Section: Resultssupporting

confidence: 75%

Near wall effects in the plug flow of pulp suspensions

et al. 2011

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Experimental data by the authors are further analysed to gain a more detailed understanding of the mechanisms of the plug flow and near-wall behaviour in the pipe flow of pulp suspensions at concentrations up to 4.7% by weight. The results indicate two-phase flow effects near the wall, one being that the apparent viscosity is higher than that of water. Another is that the wall shear stress estimated with the pressure drop data and a force balance is much higher than the one obtained with the measured velocity profile, indicating the presence of mechanical friction forces.Les données expérimentales des auteurs sont analysées plus en détail pour mieux comprendre les mécanismes d'écoulement en piston et le comportementà proximité des parois lors d'un débit en canalisation de suspensions de pâtesà des concentrations pouvant aller jusqu'à 4,7% par poids. Les résultats indiquent des effets d'écoulement en deux phasesà proximité de la paroi, l'unétant que la viscosité apparente est supérieurè a celle de l'eau, l'autreétant que la contrainte de cisaillement au niveau de la paroi estimée avec les données de chute de pression et une balance de forces est bien supérieureà celle obtenue avec le profil de vélocité mesuré, ce qui indique la présence de forces mécaniques de friction.

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Section: Resultssupporting

confidence: 75%

Near wall effects in the plug flow of pulp suspensions

et al. 2011

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“…The flow of suspensions containing nonspherical particles is ubiquitous in natural, industrial, and biomedical processes. Industrial processes like, fluidization [1], pneumatic transport of solids [2,3], processing in paper industry [4,5,6], and wastewater treatments [7] deal with the flow of nonspherical particles. Raw materials used in all the processes deviate a lot from the ideal spherical structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of rough wall on drag, lift, and torque on an ellipsoidal particle in a linear shear flow

Bhagat¹,

Goswami²

2022

Preprint

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The present study provides a detailed description of the forces on an ellipsoidal particle in the vicinity of the rough wall. Three-dimensional numerical simulations are performed using body-fitted mesh to estimate the drag, lift, and torque coefficients. A large number of simulations are conducted over a range of parameters such as shear Reynolds number (10 ≤ Re s ≤ 100), orientation angle (0°≤ θ ≤ 180°), and wall-particle separation distance (0.1 ≤ δ ≤ 2.0) to get a comprehensive description of variation of the above coefficients. Using the simulation results, we develop the correlations for the drag and lift coefficients to describe the effect of rough wall, inclination angles, and particle Reynolds numbers on the hydrodynamic coefficients. The proposed correlations can be used for two phase flow simulation using Eulerian-Lagrangian framework.

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“…Transition flow is illustrated in Fig. 1 where pressure drop is plotted against velocity [1][2][3][4][5][6].…”

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confidence: 99%

“…The majority of the published design correlations refer to the flow system before the maximum in the head loss curve (V max ), and there is a general agreement on the application of Eq. 1 to this flow system [8][9][10]: ( 1 ) where is the friction head loss ; V is the bulk velocity ; Cons is the pulp consistency (%); D P is the internal pipe diameter (mm) ; K is a numerical coefficient, constant for a given pulp; and a, b,  are exponents, assuming also constants values for a given pulp.…”

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confidence: 99%

Flow dynamics of pulp fiber suspensions

Ventura¹,

Garcı́a²,

Ferreira³

et al. 2008

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The transport between different equipment and unit operations plays an important role in pulp and paper mills because fiber suspensions differ from all other solid-liquid systems, due to the complex interactions between the different pulp and paper components. Poor understanding of the suspensions’ flow dynamics means the industrial equipment design is usually conservative and frequently oversized, thus contributing to excessive energy consumption in the plants. Our study aim was to obtain additional knowledge about the dynamic behavior of industrial pulp suspensions in order to evaluate the relative importance of the factors that influence pressure drop. To obtain mathematical correlations to quantify pressure drop for the transport of pulp suspensions, we studied four different industrial pulp suspensions (recycled pulp, eucalypt bleached kraft pulp, pine unbleached kraft pulp, and eucalypt [90%] + pine [10%] bleached kraft pulp) in a pilot rig specially designed and built for the effect.

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Flow characteristics and circular pipe flow of pulp-suspension.

Cited by 10 publications

References 4 publications

Near wall effects in the plug flow of pulp suspensions

Near wall effects in the plug flow of pulp suspensions

Effect of rough wall on drag, lift, and torque on an ellipsoidal particle in a linear shear flow

Flow dynamics of pulp fiber suspensions

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