turbulent drag reduction by polyacrylamide and other belgique

turbulent drag reduction by polyacrylamide and other polymers

Turbulent Drag Reduction by Polyacrylamide and Other Polymers

Drag reduction in turbulent flow of several acrylamide base polymers has been investigated and compared with the drag reduction performance of polyethylene oxides. The carboxyl content of the acrylamide-acrylate copolymers studied varied between 0.2 and 40 percent.

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turbulent drag reduction by polymer additives in parallel

Turbulent drag reduction by polymer additives in parallel

In this study, turbulent drag reduction with polyacrylamide, a flexible polymer, has been investigated in a cylindrical pipe, a rectangular channel and a square duct. The polymer solutions were subjected to various levels of degradation by recirculating through the experimental rigs, and their shear and extensional rheological properties were

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turbulent drag reduction in tubes with polymer solutions

Turbulent Drag Reduction in Tubes with Polymer Solutions

This thesis is a study of drag reduction with polymer solutions in tubes using a simple rheometer. The drag reduction was studied in five dlfferent small diameter tubes at Reynold's number varying from 1000 to 25000. A polyacrylamide, MRL-402, manufactured by Stein Hall Ltd. was chosen for the above study because

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advanced turbulent drag reducing and flocculating materials

Advanced Turbulent Drag Reducing and Flocculating Materials

Abstract. Synthetic Polyacrylamide based polymers and polysaccharides such as guar gum, xanthan gum carboxymethylcellulose and starch have been used for long. The Polyacrylamides are easily amenable to shear degradation although they are very efficient drag reducing and flocculating agents even at low ppm concentrations.

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polyacrylamide degradation and its implications in

Polyacrylamide degradation and its implications in

The molecular weight (MW) of commercial PAM ranges from 10 5 to >10 7 Da. High MW PAM (>10 6 Da) has a wider range of applications due to its high viscosity, drag reduction capabilities, and water

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performance of polyacrylamide as drag reduction polymer of

Performance of polyacrylamide as drag reduction polymer of

The influence of polyacrylamide (PAM) as drag reducing polymer on flow of Iraqi crude oil in pipe lines was investigated in the present work. The effect additive concentration, pipe diameter, solution flow rate and the presence of radius elbows on the percentage of drag reduction (%Dr) and the amount of flow increases (%FI) were the variables of study.

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drag‐reduction efficiency, shear stability, and

Drag‐reduction efficiency, shear stability, and

Ram Prakash Singh, Advanced Turbulent Drag Reducing and Flocculating Materials Based on Polysaccharides, Polymers and Other Advanced Materials, 10.1007/978-1-4899-0502-4, (227-249), (1995). Crossref Volume 43 , Issue 6

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turbulent drag effectiveness and shear stability of xanthan

Turbulent drag effectiveness and shear stability of xanthan

A number of graft copolymers of xanthan gum and polyacrylamide have been synthesized by grafting acrylamide onto xanthan gum using the ceric‐ion‐initiated solution polymerization technique. The effec

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λ-dna induced turbulent drag reduction and its

λ-DNA Induced Turbulent Drag Reduction and Its

Turbulent drag reduction (DR) induced by monodispersed high molecular weight λ-DNA in a buffer solution under a turbulent flow was investigated using a rotating disk apparatus. The DR efficiency was maintained over time due to the durability of the λ-DNA in a moderate turbulent shear flow, and this behavior was compared to a water-soluble linear flexible long chain polyacrylamide (PAAM). To

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turbulent drag reduction efficiency and mechanical

Turbulent Drag Reduction Efficiency and Mechanical

Turbulent drag reduction (DR) efficiency and mechanical degradation of high‐molecular‐weight poly (acrylamide) (PAAM) was investigated in a rotating disk apparatus. Drag reduction efficiency

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drag reduction induced by flexible and rigid molecules in a

Drag reduction induced by flexible and rigid molecules in a

Drag reduction induced by flexible and rigid molecules in a turbulent flow into a rotating cylindrical double gap device: Comparison between Poly (ethylene oxide), Polyacrylamide, and Xanthan Gum Author links open overlay panel Anselmo S. Pereira Rafhael M. Andrade Edson J. Soares

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drag reduction - snf

Drag Reduction - SNF

drag reduction occurs only in fluids that are in the turbulent flow regime, above a Reynolds number of 2000. drag reduction is greater in small diameter pipe due to the roughness factor relative to the pipe diameter. drag reduction in dilute solutions increases with increasing polymer concentration up to a limit.

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turbulent drag effectiveness and shear stability of xanthan

Turbulent drag effectiveness and shear stability of xanthan

A number of graft copolymers of xanthan gum and polyacrylamide have been synthesized by grafting acrylamide onto xanthan gum using the ceric‐ion‐initiated solution polymerization technique. The effec

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scission-induced bounds on maximum polymer drag reduction in

Scission-induced bounds on maximum polymer drag reduction in

tional losses in turbulent pipe flows.1,2 This phenomenon, referred to as polymer turbulent drag reduction, has gener-ated significant interest because of potential technological applications such as fast ocean transport and efficient pipe-line transport of fluids.3–5 According to Virk’s phenomenology,6 the simplest way

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pipeline drag reducers (conference) | etdeweb

Pipeline Drag Reducers (Conference) | ETDEWEB

The drag reducing additive minimizes the flow turbulence, increases throughput and reduces the energy costs. The Flow can be increased by more than 80 % with existing assets. The effectiveness of the injected drag reducer in Mostorod to Tanta crude oil pipeline achieved 35.4 % drag reduction and 23.2 % flow increase of the.

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(pdf) performance of polyacrylamide as drag reduction polymer

(PDF) Performance of polyacrylamide as drag reduction polymer

Author's personal copy Performance of polyacrylamide as drag reduction polymer of crude petroleum flow 865 [6] Takashi S, Hiromoto U. Drag reduction and heat transfer Ali A. Abdul-Hadi obtained his MSc in 1997, reduction by cationic surfactants. J Chem Eng Jpn 1993;26:103–6.

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λ-dna induced turbulent drag reduction and its

λ-DNA Induced Turbulent Drag Reduction and Its

Turbulent drag reduction (DR) induced by monodispersed high molecular weight λ-DNA in a buffer solution under a turbulent flow was investigated using a rotating disk apparatus. The DR efficiency was maintained over time due to the durability of the λ-DNA in a moderate turbulent shear flow, and this behavior was compared to a water-soluble linear flexible long chain polyacrylamide (PAAM). To

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turbulent drag reduction efficiency and mechanical

Turbulent Drag Reduction Efficiency and Mechanical

Turbulent drag reduction (DR) efficiency and mechanical degradation of high‐molecular‐weight poly (acrylamide) (PAAM) was investigated in a rotating disk apparatus. Drag reduction efficiency

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turbulent drag reduction in tubes with polymer solutions

Turbulent Drag Reduction in Tubes with Polymer Solutions

This thesis is a study of drag reduction with polymer solutions in tubes using a simple rheometer. The drag reduction was studied in five dlfferent small diameter tubes at Reynold's number varying from 1000 to 25000. A polyacrylamide, MRL-402, manufactured by Stein Hall Ltd. was chosen for the above study because

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a review of drag reduction in a turbulent flow using polymers

A Review of Drag Reduction in a Turbulent Flow using Polymers

induced drag reduction in turbulent flow in a pipe. It was Virk in the year 1975 found that there is no drag reduction at low Reynolds number (laminar flow) and there is a considerable amount of drag reduction in the turbulent regime. He presented experimental evidence that drag

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polyacrylamide degradation and its implications in

Polyacrylamide degradation and its implications in

The molecular weight (MW) of commercial PAM ranges from 10 5 to >10 7 Da. High MW PAM (>10 6 Da) has a wider range of applications due to its high viscosity, drag reduction capabilities, and water

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λ-dna induced turbulent drag reduction and its

λ-DNA Induced Turbulent Drag Reduction and Its

New mechanism and correlation for degradation of drag-reducing agents in turbulent flow with measured data from a double-gap rheometer. Colloid and Polymer Science 2018, 296 (4) , 829-834. DOI: 10.1007/s00396-018-4300-4., , . Applications of Water-Soluble Polymers in Turbulent Drag Reduction.

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cooperative drag reduction in turbulent flows using polymer

Cooperative drag reduction in turbulent flows using polymer

The injection of long-chain polymer additives and the water-repellent (or superhydrophobic) texturing of submerged solid walls, have both evolved independently over the years into effective, stand-alone methods for frictional drag reduction in wall-bounded turbulent flows. Experiments performed in turbulent Taylor-Couette flow demonstrate that the two techniques, when combined carefully

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dra|drag reducing agent|flow improver|drag reducer , china

DRA|Drag reducing agent|flow improver|drag reducer , China

In a turbulent flow regime, the fluid molecules move in a random manner, causing much of the energy applied to them to be wasted as eddy currents and other indiscriminate motion. DRA works by an interaction of the polymer molecules with the turbulence of the flowing fluid. 3.What is the true value of using DRA(drag reducing agent)?

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