Flow Increase in the Trans Alaska Pipeline Through Use of a Polymeric Drag-Reducing Additive

1982 ◽  
Vol 34 (02) ◽  
pp. 377-386 ◽  
Author(s):  
E.D. Burger ◽  
W.R. Munk ◽  
H.A. Wahl
Keyword(s):  
Drag Reducing Additive

Heat Transfer in a Surfactant Drag-Reducing Solution—A Comparison With Predictions for Laminar Flow

2005 ◽  
Vol 128 (6) ◽  
pp. 557-563 ◽  
Author(s):  
Paul L. Sears ◽  
Libing Yang
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Reynolds Numbers ◽  
High Heat ◽  
High Heat Flux ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Nusselt Numbers ◽  
Drag Reducing Additive ◽  
Good Agreement

Heat transfer coefficients were measured for a solution of surfactant drag-reducing additive in the entrance region of a uniformly heated horizontal cylindrical pipe with Reynolds numbers from 25,000 to 140,000 and temperatures from 30to70°C. In the absence of circumferential buoyancy effects, the measured Nusselt numbers were found to be in good agreement with theoretical results for laminar flow. Buoyancy effects, manifested as substantially higher Nusselt numbers, were seen in experiments carried out at high heat flux.

An Experimental Study of the Effect of Drag Reducing Additive on the Structure of Turbulence in Concentric Annular Pipe Flow Using Particle Image Velocimetry Technique

2013 ◽  
Author(s):  
Fabio Ernesto Rodriguez Corredor ◽  
Majid Bizhani ◽  
Ergun Kuru
Keyword(s):  
Particle Image Velocimetry ◽  
Fluid Flow ◽  
Pipe Flow ◽  
Particle Image ◽  
Polymer Concentration ◽  
Velocity Fluctuations ◽  
Polymer Fluid ◽  
Image Velocimetry ◽  
Drag Reducing Additive ◽  
Annular Pipe

The effect of drag reducing additive on the structure of turbulence in concentric annular pipe flow was investigated using Particle Image Velocimetry (PIV) technique. Experiments were conducted using a 9m long horizontal flow loop with concentric annular geometry (inner to outer pipe radius ratio = 0.4). The drag reducing additive was a commercially available partially hydrolyzed polyacrylamide (PHPA). The experiments were conducted using 0.1% V/V polymer concentration, giving a drag reduction of 26% at a solvent Reynolds number equal to 56400. Near wall local fluctuating velocity values were determined by analysing the PIV data. The root mean square (RMS) values of radial velocity fluctuations showed a significant decrease with the use of drag reducing additive. The RMS values of axial velocity fluctuations near the wall (Y+<10) were similar for both water and polymer fluid flow; though, higher peaks were obtained during the polymer fluid flow. As compared to water flow, a strong reduction in vorticity was observed during polymer fluid flow. The degree of vorticity reduction on the inner wall was higher than that of the outer wall. Results of the viscous dissipation and the shear production terms in the kinetic energy budget showed that less energy was produced and dissipated by the route of turbulence when using polymer fluid.

scholarly journals Some cavitation experiments with dilute polymer solutions

1970 ◽  
Vol 44 (1) ◽  
pp. 51-63 ◽  
Author(s):  
Christopher Brennen
Keyword(s):  
Surface Flow ◽  
Cavity Surface ◽  
Surface Boundary ◽  
Surface Boundary Layer ◽  
Dilute Polymer Solutions ◽  
Turbulent Drag ◽  
Boundary Layer Instability ◽  
Drag Reducing Additive ◽  
Principal Subject ◽  
Initial Objective

Experiments on fully developed cavity flows were carried out with the prime initial objective of investigating the effects of the addition of small quantities of ‘turbulent drag reducing additive’ upon the cavity-surface boundary-layer instability and transition reported in the previous paper (Brennen 1970). However, in most instances, the additives were found to cause an unforeseen instability in the wetted surface flow around the headform. Upon convection, the resulting disturbances dramatically disfigured the cavity surface, thus negating the original purpose. This new phenomenon warranted investigation and became the principal subject of this paper.

The influence of asphaltenes and resins on drag reducing additive efficiency

2019 ◽  
Vol 9 (2) ◽  
pp. 144-150
Author(s):  
Ilnaz I. Khasbiullin ◽  
◽  
Marat I. Valiev ◽  
Maxim V. Sukhovey ◽  
Mursalim M. Gareev ◽  
...  
Keyword(s):  
Drag Reducing Additive

scholarly journals Numerical Study on Influences of Drag Reducing Additive in Supercritical Flow of Kerosene in a Millichannel

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6758
Author(s):  
Biao Li ◽  
Wenxi Li ◽  
Xin Zheng ◽  
Yue Wang ◽  
Mingming Tang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Physical Properties ◽  
Numerical Study ◽  
Simulation Method ◽  
Inlet Temperature ◽  
Heat Transfer Characteristics ◽  
Supercritical Flow ◽  
Transfer Characteristics ◽  
Drag Reducing Additive

To improve the performance of a high-pressure refueling liquid oxy-kerosene engine, the influence of drag-reducing additive on the heat transfer characteristics in the supercritical flow of kerosene in a microchannel for regenerative cooling is explored. The finite-volume CFD numerical simulation method is applied using the RNG k-ε turbulence model and enhanced wall function. The current work faithfully represents the effect of the drag-reducing additive in kerosene through numerical calculations by combining a 10-component model for the physical properties of the kerosene and the Carreau non-Newtonian fluid constitutive model from rheological measurements. Results suggest that the 10-component kerosene surrogate can describe the supercritical physical properties of kerosene. The inlet temperature, inlet velocity, and the heat flux on the channel wall are driving factors for the supercritical kerosene flow and heat transfer characteristics. The pressure influence on the heat transfer is negligible. With polymer additives, the loss in pressure drop and heat transfer performance of supercritical kerosene flow decrease 46.8% and 37.5% respectively. The enhancement of engine thrust caused by reduction in pressure drop is an attractive improvement of concern.

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