Drag Reduction of Biopolymer Solutions : Pressure Loss of Malted Rice Solutions in a Circular Pipe(Fluids Engineering)

The rheological properties and friction pressure losses of several common well-drilling, completion, and stimulation fluids have been investigated experimentally. These fluids include polymeric fluids—Xanthan gum, partially hydrolyzed polyacrylamide (PHPA), guar gum, and hydroxyethyl cellulose (HEC), bentonite drilling mud, oil-based drilling mud, and guar-based fracturing slurries. Rheological measurements using a Bohlin CS 50 rheometer and a model 35 Fann viscometer showed that these fluids exhibit shear thinning and thermal thinning behavior except the bentonite drilling mud whose viscosity increased as the temperature was raised. Flow experiments using a full-scale coiled tubing test facility showed that the friction pressure loss in coiled tubing is significantly higher than in straight tubing. Since the polymeric fluids displayed drag reducing property, their drag reduction behavior in straight and coiled tubings was analyzed and compared. Plots of drag reduction vs. generalized Reynolds number indicate that the drag reduction in coiled tubing was not affected by polymer concentration as much as in straight tubing. The onsets of turbulence and drag reduction in coiled tubing were significantly delayed as compared with straight tubing. The effect of solids content on the friction pressure losses in coiled tubing is also briefly discussed.

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Experimental investigation on drag reduction of flowing crop suspensions of the pulp fibers in circular pipe heat exchanger

Particulate Science And Technology ◽

10.1080/02726351.2018.1564093 ◽

2019 ◽

Vol 38 (4) ◽

pp. 443-453 ◽

Cited By ~ 1

Author(s):

Syed Muzamil Ahmed ◽

Salim Newaz Kazi ◽

Ghullamullah Khan ◽

Naveed Akram ◽

Mahidzal Dahari ◽

...

Keyword(s):

Experimental Investigation ◽

Heat Exchanger ◽

Drag Reduction ◽

Circular Pipe ◽

Pulp Fibers ◽

Pipe Heat

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An investigation on the drag reduction performance of bioinspired pipeline surfaces with transverse microgrooves

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.11.3 ◽

2020 ◽

Vol 11 ◽

pp. 24-40 ◽

Cited By ~ 1

Author(s):

Weili Liu ◽

Hongjian Ni ◽

Peng Wang ◽

Yi Zhou

Keyword(s):

Numerical Simulation ◽

Drag Reduction ◽

Pressure Loss ◽

Fluid Transport ◽

Reduction Rate ◽

Orthogonal Analysis ◽

Maximum Drag Reduction ◽

Reduction Effect ◽

Save Energy ◽

Microgrooved Surface

A novel surface morphology for pipelines using transverse microgrooves was proposed in order to reduce the pressure loss of fluid transport. Numerical simulation and experimental research efforts were undertaken to evaluate the drag reduction performance of these bionic pipelines. It was found that the vortex ‘cushioning’ and ‘driving’ effects produced by the vortexes in the microgrooves were the main reason for obtaining a drag reduction effect. The shear stress of the microgrooved surface was reduced significantly owing to the decline of the velocity gradient. Altogether, bionic pipelines achieved drag reduction effects both in a pipeline and in a concentric annulus flow model. The primary and secondary order of effect on the drag reduction and optimal microgroove geometric parameters were obtained by an orthogonal analysis method. The comparative experiments were conducted in a water tunnel, and a maximum drag reduction rate of 3.21% could be achieved. The numerical simulation and experimental results were cross-checked and found to be consistent with each other, allowing to verify that the utilization of bionic theory to reduce the pressure loss of fluid transport is feasible. These results can provide theoretical guidance to save energy in pipeline transportations.

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