Heat transfer in the drag reducing regime of wood pulp fibre suspensions

Kazi, M. Salim Newaz; Duffy, G. G.; Chen, Xiao

doi:10.1016/s1385-8947(99)00047-9

Cited by 45 publications

(15 citation statements)

References 1 publication

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“…The deviations in pressure drop between kcm, kbm and kckb3 pulp suspensions are due to fiber flexibility and lignin content and aspect ratios. The findings and data trends are similar with the previous researchers for wood pulp and synthetic fibers [4,13,[22][23][24].…”

Section: Fiber Characterizationsupporting

confidence: 91%

“…It is observed that at the lowest velocity 0.4 m/s the drag ratios of suspensions are sufficiently higher than that of water, whereas at the highest concentration of 0.6 wt.% have shown the highest drag ratio. Higher drag ratio at low velocity, substantially owing to the presence of a plug where the turbulent sheared layer between the plug and the pipe wall is very thin and the velocity profile is steep [13]. The drag reduction is not achieved throughout the range of velocity (0.4 -2.8 m/s) for all consistencies of pulp suspensions.…”

Section: Concentration Effect Of Fiber On Pressure Dropmentioning

confidence: 95%

“…Kazi, Duffy and Chen [13] have studied drag reduction of wood pulp fiber at different consistencies over a range of flow rates in a pipe. They observed that small amount of fiber in suspension reduces pressure losses than that of water.…”

Section: Introductionmentioning

confidence: 99%

“…They observed that small amount of fiber in suspension reduces pressure losses than that of water. Duffy, Kazi and Chen [5] considered the findings [13] and correlated the pressure drop with fibers and paper properties. They reported that little modification in fiber properties could be sensed by some little changes in pressure drop at low consistency.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on momentum and drag reduction of Malaysian crop suspensions in closed conduit flow

Ahmed

Kazi

K̲h̲ān

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The study of frictional losses in fiber suspension flow is one of the significant scientific interests as the characteristics of suspension flow considerably changes with shear stress, fiber source, and treatments applied on fibers. Pressure drop measurements were obtained for different Malaysian crop fiber suspensions flowing through a closed conduit. The generated data were gathered over a range of flow rates and suspension concentrations. It was found that the magnitude of the pressure drop of the fiber suspensions is dependent on the concentration, characteristics, and fiber source. Considerable drag reduction is obtained for concentration of 0.6 wt. % at high flow rates. Such a reduction of pressure drop at the particular concentrations and the flow rates is interesting and useful as these data can be used for design and optimization of fiber handling equipment and piping systems. Furthermore, the effect of different fibers, fiber properties and flexibility on pressure drop were studied.

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Section: Fiber Characterizationsupporting

confidence: 91%

Section: Concentration Effect Of Fiber On Pressure Dropmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation on momentum and drag reduction of Malaysian crop suspensions in closed conduit flow

Ahmed

Kazi

K̲h̲ān

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Below the critical shear stress, we observe freely rotating micelles with no ordered orientation [2] (Bewersdorff 1986). The The DR of combination for two-phase liquids, dilute polymer and surfactant solutions-have been studied previously by numerous researchers [3][4][5][6][7][8][9][10] The presence of polymer with surfactant micelle-like aggregates begin to form at a critical aggregation concentration (cmc). Thus cmc is an analogue of cmc in solutions of surfactants with added polymeric component.…”

Section: Introductionmentioning

confidence: 99%

Effect of SDBS on the drag reduction characteristics of polyacrylamide in a rotating disk apparatus

Bari

Yousif

Yaacob³

et al. 2015

IJBAS

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This paper focuses on the determination of the interaction between polymer (Polyacrylamide (PAM)) and surfactant (Sodium dod benzene sulfonate (SDBS)) as a drag reducer using Rotating Disk apparatus (RDA) at various concentrations (500, 700, 1000, 1500 and 2000) ppm individually and in the combined form under turbulent conditions at different rotation speed up to 3000 rpm, as well as studying their mechanisms as a drag reducer. The results show that the maximum percent drag reduction increases to (40, 41, 43, 45 and 48)% by using the combined additives of surfactant and polymer at the above concentrations respectively, with slower degradation and display drag reduction for a larger range of Reynolds numbers. The nano and micro particles formed from the combined PAA and SDBSA was studied using cryo-transmission electron microscopy (cryo-TEM) techniques. The images show the surrounding of polymer chain to the surfactant micelle to form an aggregate structure. A hexagonal crystalline form was suggested to describe the shape of the aggregate structure.

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Heat‐transfer fouling mitigation with model synthetic fibre suspensions

Duffy

McShane

2007

Asia-Pacific J Chem Eng

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Suspensions of model polymer fibres at a fixed concentration and flow rate have been shown to mitigate heat-transfer fouling. The results are in general agreement with previous studies using wood pulp fibre suspensions under the same conditions. Stiffer and shorter fibres were found to increase the initial induction period before the onset of fouling. Longer and more flexible fibres reduced the ultimate thickness of the fouling deposit as well as the ultimate asymptotic level of fouling resistance. 

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Heat transfer in the drag reducing regime of wood pulp fibre suspensions

Cited by 45 publications

References 1 publication

Experimental investigation on momentum and drag reduction of Malaysian crop suspensions in closed conduit flow

Experimental investigation on momentum and drag reduction of Malaysian crop suspensions in closed conduit flow

Effect of SDBS on the drag reduction characteristics of polyacrylamide in a rotating disk apparatus

Heat‐transfer fouling mitigation with model synthetic fibre suspensions

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