[PDF] Top 20 Drag reduction in pipe flows with polymer additives
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Drag reduction in pipe flows with polymer additives
... This Thesis is brought to you for free and open access by the Thesis/Dissertation Collections at RIT Scholar Works. It has been accepted for inclusion in Theses by an authorized administrator of RIT Scholar Works. For ... See full document
91
Stabilisation and drag reduction of pipe flows by flattening the base profile
... of pipe flows Several different control strategies have been designed in the past fifty years to reduce the wall friction of fully turbulent flows (refer, for example, to Lumley & Blossey 1998; ... See full document
26
Numerical Study of Polymer-induced Drag Reduction in Turbulent Pipe Flow
... Keywords: drag reduction, turbulent flow, viscoelastic polymer 1 Introduction Polymer additives are often used to reduce friction drag of wall-bounded turbulent ...a ... See full document
16
A mechanistic model of turbulent drag reduction by additives
... Keywords: Drag reduction; Turbulent flow; Polymer additives ...of drag reduction in turbulent flows by additives was apparently discovered by Toms in 1948, and has been ... See full document
8
Drag Reduction by Additives in Curved Pipes for Single-Phase Liquid and Two-Phase Flows: A Review
... Liquid Flows in Coiled and Curve Pipes Application of micro-bubbles for DR in curved pipe flows have received little scholarly attention and the effect of micro-bubbles on pressure losses as well as ... See full document
33
CFD simulation of drag reduction in pipe flow by turbulence energy promoters
... in drag reduction is inspired by the shark’s skin which is made up of streamlined V-shaped tooth like ...the drag when this predator is moving underwater and allows it to hunt with less ...the ... See full document
6
Increasing Strickler coefficient by the drag reduction technique in open-channel flows
... The drag reduction method by polymer additives is generally used to reduce friction losses in pipes over long- ...the polymer and the turbulent flow structures tend to change the ... See full document
8
Polymer Drag Reduction for Single-Phase Water Flow in and around 180° Bends
... on flows in U-bends. Polymer degradation often results from chain scission resulting in reduced molecular weight of the ...the reduction in molecular weight of the polymer did not have a ... See full document
20
Drag Reduction in Oil-water Flows
... of polymer solution was added to the water phase, drag reduction of 80 % was found in single phase water flows and 52 % in oil-water ...flows. Drag reduction was found to ... See full document
183
Drag Reduction with Biopolymer-Synthetic Polymer Mixtures in Oil-Water Flows: Effect of Synergy
... 0.02-m pipe diameter at νo = 0.75. 4.3 Drag reduction in multiphase flow experiments The DR of the DRPs (HPAM, PEO, AVM, HPAM&AVM and PEO&AVM) in multiphase flow at different νo and 𝑅𝑒 𝑚𝑖𝑥 and MTC of ... See full document
12
Investigations on Drag Reduction by Interactions between Polymer and Surfactant and Polymer and Polymer
... study, polymer-surfactant and polymer-polymer mixed additives are used in order to explore the synergistic effects and interactions in pipeline flow ...of polymer with surfactant and ... See full document
266
Turbulent Friction Drag Reduction Using Electroactive Polymer Surfaces
... that, by the manipulation and alteration of low-speed streaks, quasi-streamwise vortices, the viscous sublayer or the hairpin-like structures that populate the near-wall region, the turbulence production cycle could be ... See full document
359
The use of polymer agents in the reduction of hydrodynamic drag for heavy oil
... conditions, polymer DRAs can be added to reduce the flow ...the polymer should have high molecular weight, which is the second condition necessary for the drag- reduction ...Conventional ... See full document
7
The Role Played by the Aging of Aloe Vera on Its Drag Reduction Properties in Turbulent Flows
... asymptotic drag reduction of the young group with concentra- tion of 200 ppm in the pipe system is considerably more efficient than that of mature group for the same concentration, DR asy young = ... See full document
38
An Experimental Study of Drag Reduction in a Pipe with Superhydrophobic Coating at Moderate Reynolds Numbers
... investigates drag reduction, durability for operations and effects for preventing microorganism from adhering to the surface when the superhydrophobic coating is applied on a solid ...a pipe flow ... See full document
8
Drag Forces in External Flows
... • Locally, the fluid flow exerts stresses on the object: tangential wall shear stress 𝜏 𝑤 due to viscosity and normal stresses due to the pressure 𝑝. Once integrated over the entire surface, viscous and pressure ... See full document
About PMC Polymer Additives
... PMC Group is a growth oriented, diversified, global chemicals company dedicated to innovative solutions to everyday needs in a broad range of end markets including plastics, building an[r] ... See full document
12
Reduction Of Drag Forces Of An Aircraft
... the drag forces by ...reduced drag effects and a retractable ...the reduction of drag forces by employing a number of methods have been discussed in this paper ...2-3% reduction in ... See full document
6
Introduction to Lubricants and Additives for Polymer Compounds
... Head group is typically soluble in polar region or adsorbs to surfaces of polymer, filler or metal. The adsorption is typically via hydrogen bonding[r] ... See full document
19
Analysis of Polymer Additives in the Packaging Industry
... perform by eliminating oxidation during and after processing when materials are exposed to an energy source (Ram, 1997). A second category of stabilizers are those that help materials withstand UV light. Ultraviolet ... See full document
13
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