Drag reduction in flow: Review of applications, mechanism and prediction

Brostow, Witold

doi:10.1016/j.jiec.2008.07.001

Cited by 99 publications

(40 citation statements)

References 52 publications

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“…This behavior is termed the polymer-induced turbulent drag reduction (DR) effect [4,5] which is an active friction reduction mechanism compared to the prevailing passive friction reduction. Thus, DR techniques have been applied in various industrial and engineering arenas, such as oil pipelines, open channels, marine applications, agricultural field irrigation, fire hoses, and biomedical systems [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

2017

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Water-soluble polymers with high molecular weights are known to decrease the frictional drag in turbulent flow very effectively at concentrations of tens or hundreds of ppm. This drag reduction efficiency of water-soluble polymers is well known to be closely associated with the flow conditions and rheological, physical, and/or chemical characteristics of the polymers added. Among the many promising polymers introduced in the past several decades, this review focuses on recent progress in the drag reduction capability of various water-soluble macromolecules in turbulent flow including both synthetic and natural polymers such as poly(ethylene oxide), poly(acrylic acid), polyacrylamide, poly(N-vinyl formamide), gums, and DNA. The polymeric species, experimental parameters, and numerical analysis of these water-soluble polymers in turbulent drag reduction are highlighted, along with several existing and potential applications. The proposed drag reduction mechanisms are also discussed based on recent experimental and numerical researches. This article will be helpful to the readers to understand better the complex behaviors of a turbulent flow with various water-soluble polymeric additives regarding experimental conditions, drag reduction mechanisms, and related applications.

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Section: Introductionmentioning

confidence: 99%

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

2017

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“…The rate constant a, with units of reciprocal time (1/s), contains information on the dynamics of mechanical degradation of the polymer chain. As an another model, the Brostow equation describing the deteriorating DR efficiency has been also suggested [36], as in the following form:…”

Section: Mechanism Of Drmentioning

confidence: 99%

Turbulent Drag Reduction with Polymers in Rotating Disk Flow

2015

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Abstract:The frictional drag in turbulent flow can be drastically reduced by the addition of minute amounts of suitable linear flexible high-molecular-weight polymers, and the various physical characteristics of the polymers used are known to be closely related to the drag reduction efficiency. This feature article briefly reviews polymer additives and factors in the system affecting turbulent drag reduction in external flow, more specifically in a rotating disk flow.

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“…There remain other problems scientists need to solve that Nature has already addressed. For example, researchers need solutions for decreasing drag in transportation and industrial fields [3,4]. In the transportation field, low-drag surfaces on vehicles, aircraft and ships would yield fuel consumption savings, which reduces cost and use of environmental resources [2,5,6].…”

Section: Introductionmentioning

confidence: 99%