Reduction of hydrodynamic drag in pipelines

Él'perin, I. T.; Smol'skii, B. M.; Levental, L. I.

doi:10.1007/bf00834558

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…El'perin et al [90] Adsorption effect Viscosity might be lessened by the adsorption layer of polymer molecules that are formed on the inner side of the tube, which results in turbulence damping, reducing the appearance of eddies in the vicinity of the wall.…”

Section: Reference Focus Summarymentioning

confidence: 99%

Applications of drag reducers for the pipeline transportation of heavy crude oils: A critical review and future research directions

et al. 2023

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The long‐distance pipeline transportation of heavy crudes demands optimal pumping procedures to abate overhead expenditures in the midstream phase. This can be facilitated by reducing both the oil viscosity and the frictional losses induced by the turbulent flow zone. The dualistic approach of reducing both viscosity and drag requires the optimization of several parameters such as concentrations and types of diluents and additives. This manuscript critically reviews various technologies being undertaken to facilitate the pipeline transportation of heavy crude oils by highlighting the technique of dilution coupled with the addition of drag reducing agents (DRA). DRA such as surfactants, nanoparticles, bio‐additives, polymers, and fibres are blended with the diluted crudes to suppress the proliferation of turbulent eddies which in turn assist in pumping the oil at a higher flow rate under constant pressure conditions. Several investigations have reported that drag reduction is significantly enhanced by varying the molecular structure of the DRA. In addition, an optimum flow rate coupled with a specific surfactant concentration at an ideal temperature can significantly reduce head losses and pumping expenditures. Further research is imperative to study the effect of the polymer structure with respect to the induced shear degradation and dissolution behavior of the crude.

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Section: Reference Focus Summarymentioning

confidence: 99%

Applications of drag reducers for the pipeline transportation of heavy crude oils: A critical review and future research directions

et al. 2023

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“…Further, it was Lumley [235], who showed that, as viscosity is dominated by inertial forces, turbulence could not be very sensitive to shear-induced viscosity changes. Though the shear-thinning wall effect theory crumpled, El'perin et al [236] proposed that there was another aspect of the wall effect which could possibly explain the phenomenon of drag reduction. They suggested that there could exist an absorbed layer of polymer molecules at the pipe wall during flow and this could lower the viscosity, create a slippage, dampen turbulence pulsations, and prevent any initiation of vorticity at the wall.…”

Section: The Proposed Theories Of Drag Reductionmentioning

confidence: 98%

A review on drag reduction with special reference to micellar systems

Shenoy

1984

Colloid & Polymer Sci

103

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A state-of-the-art review on drag reduction has been presented in order to bring out some important aspects of the drag reduction phenomenon and its potential for practical use. The review is biased towards micellar systems and discusses in detail the morphological differences between drag reducing polymeric and micellar systems. Work relating to polymeric systems has not been dealt in detail as it has been the subject of earlier reviews. Studies relating to biological additives as well as suspensions have been briefly mentioned without detailed discussion as their potential for practical use presently appears to be limited.

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