Improved drag reduction by control of polymer particle size

Little, R. C.; Smidt, Suzanne; Huang, Paul Xiubao; Romans, J. B.; Dedrick, J. H.; Matuszko, Jan S.

doi:10.1021/ie00050a018

Cited by 27 publications

(6 citation statements)

References 4 publications

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“…) 1.839Sc 0.33 Re 0.43 (d n /d) -1. 23 (17) polymers. [36][37][38] Polymer molecules, and H + and SO 4 ions resulting from H 2 SO 4 ionization, compete for waters of hydration.…”

Section: Shmentioning

confidence: 99%

“…These polymers proved to be effective in reducing mass-transfer- and diffusion-controlled corrosion in pipelines , and agitated vessels 7,8 operated under turbulent flow. Drag-reducing polymers have the potential of being used in annular equipment operating under turbulent flow to reduce pumping power consumption − by virtue of the ability of polymer molecules to dampen the small-scale, high-frequency energy dissipating eddies which prevail in the buffer sublayer of the hydrodynamic boundary layer. , Polyox WSR−301 (polyethelene oxide), a product of Union Carbide, was used in the present work in the form of a slurry rather than a solution to minimize mechanical degradation of the polymer molecules as recommended by Little et al…”

Section: Introductionmentioning

confidence: 99%

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Mass-Transfer-Controlled Impingement Corrosion at the Jet Inlet Zone of an Annulus under Turbulent Flow

Zahran¹,

Sedahmed²,

Abdelwahab³

et al. 2006

Ind. Eng. Chem. Res.

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Diffusion-controlled impingement corrosion of the lower part of the inner cylinder of an annulus caused by a perpendicular inlet jet was studied using the diffusion-controlled dissolution of copper in acidified dichromate technique. Variables studied were solution velocity, physical properties of the solution, diameter of the perpendicular feed nozzle, and the effect of drag-reducing polymers. For blank solution, the rate of mass-transfer-controlled impingement corrosion was correlated by the equation Sh = 2.74Sc 0.33 Re 0.46(d n/d)-0.4. Drag-reducing polymers were found to decrease the rate of mass-transfer-controlled impingement corrosion by an amount ranging from 29.9 to 68.9% depending on electrolyte concentration, polymer concentration, and feed nozzle diameter. The importance of the present results to the design of annular equipment was noted.

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“…) 1.839Sc 0.33 Re 0.43 (d n /d) -1. 23 (17) polymers. [36][37][38] Polymer molecules, and H + and SO 4 ions resulting from H 2 SO 4 ionization, compete for waters of hydration.…”

Section: Shmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mass-Transfer-Controlled Impingement Corrosion at the Jet Inlet Zone of an Annulus under Turbulent Flow

Zahran¹,

Sedahmed²,

Abdelwahab³

et al. 2006

Ind. Eng. Chem. Res.

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“…The diffusivity of ferricyanide was taken from the literature. , During each run, the temperature was measured and the physical properties of the solution were adjusted accordingly. To test the effect of drag-reducing polymers on the rate of mass transfer, Polyox WSR-301 (a product of Union Carbide) was used in the form of solid slurry, rather than in the form of a solution to minimize its shear degradation . The polymer powder has a density of 1.15−1.26 g/cm 3 , and the particle size ranged from <38 μm to >500 μm.…”

Section: Experimental Techniquementioning

confidence: 99%

Liquid−Solid Mass Transfer at a Fixed Bed of Lessing Rings, in Relation to Electrochemical Reactor Design

Hassan

Zahran

Mansour

et al. 2005

Ind. Eng. Chem. Res.

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The mass-transfer behavior of a fixed bed of Lessing rings, under single- and two-phase flow, was studied by measuring the limiting current of the cathodic reduction of the ferricyanide ion. Variables studied included ring diameter (d), solution flow rate, gas flow rate, physical properties of the solution, and the effect of drag-reducing polymers. The single-phase mass-transfer data were correlated for the conditions of 1390 < Sc < 4763 (where Sc is the Schmidt number, which represents a dimensionless kinematic viscosity/molecular diffusivity coefficient), 166 < Re < 722 (where Re is the solution Reynolds number, which represents a dimensionless flow parameter), and 1 cm < d < 1.4 cm by the equation Sh = 1.57Sc 0.33 Re 0.46 (where Sh is the Sherwood number, which represents a dimensionless mass-transfer coefficient). The two-phase mass-transfer data were correlated for the conditions 1390 < Sc < 4763, 144 < Re < 748, 60 < Re g < 818 (where Re g is the gas Reynolds number), and 1 cm < d < 1.4 cm by the equation Sh = 1.93Sc 0.33 Re 0.34 Re g 0.11. Polyox WSR-301 drag-reducing polymer was found to reduce the rate of mass transfer by an amount of 17.2%−32.7% for single-phase flow; for two-phase flow, the decrease in the rate of mass transfer was 27%−34%. Implication of the present results for the design and operation of electrochemical reactorsespecially those involving gas absorptionwas noted.

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“…The polymer was added to the solution in the form of solid powder, as suggested by Little et al. 24, with polymer concentrations ranging from 100 to 300 ppm. The use of polymer powder avoids shear degradation of the polymer during runs.…”

Section: Experimental Techniquementioning

confidence: 99%

Liquid‐Solid Mass Transfer Behavior of a Stirred‐Tank Reactor with a Fixed Bed at Its Bottom

et al. 2014

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The mass transfer behavior of a new batch stirred tank with a fixed bed of Raschig rings at the bottom was studied using diffusion-controlled dissolution of copper in acidified dichromate. Variables studied, amongst others, were the impeller rotation speed, Raschig ring diameter, fixed-bed height, and impeller geometry. The rate of mass transfer from the fixed bed to the solution increased with increasing impeller rotation speed, decreasing particle size, and decreasing bed height. The axial-flow turbine is more efficient in increasing the rate of mass transfer than the radial-flow turbine. The presented reactor is especially useful for conducting diffusion-controlled liquid-solid catalytic reactions involving reactants that need to be dispersed first, such as sparingly soluble solid particles.

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Improved drag reduction by control of polymer particle size

Cited by 27 publications

References 4 publications

Mass-Transfer-Controlled Impingement Corrosion at the Jet Inlet Zone of an Annulus under Turbulent Flow

Mass-Transfer-Controlled Impingement Corrosion at the Jet Inlet Zone of an Annulus under Turbulent Flow

Liquid−Solid Mass Transfer at a Fixed Bed of Lessing Rings, in Relation to Electrochemical Reactor Design

Liquid‐Solid Mass Transfer Behavior of a Stirred‐Tank Reactor with a Fixed Bed at Its Bottom

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