Turbulent Drag Reduction and Degradation of DNA

Choi, Hyeok; Lim, Sang Kyoo; Lai, Pik Yin; Chan, C. K.

doi:10.1103/physrevlett.89.088302

Cited by 84 publications

(81 citation statements)

References 19 publications

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“…13. The middle curve corresponds to Re= 1.2 × 10 6 , which coincides with the experimental conditions (Choi et al, 2002). One sees, however, that the dependence of %DR on Re is rather weak.…”

Section: B Drag Reduction When Polymers Are Degradedsupporting

confidence: 82%

“…13 is that for small Q (actually for Q ≤ 0.5 or %DR ≤ 20), %DR is approximately a linear function of Q. The experiments (Choi et al, 2002) …”

Section: B Drag Reduction When Polymers Are Degradedmentioning

confidence: 85%

“…Another interesting experimental piece of information about cross-overs was provided by Choi et al (2002). Here turbulence was produced in a counter-rotating disks apparatus, with λ-DNA molecules used to reduce the drag.…”

Section: Cross-overs With Flexible Polymersmentioning

confidence: 99%

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Colloquium: Theory of drag reduction by polymers in wall-bounded turbulence

2008

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The flow of fluids in channels, pipes or ducts, as in any other wall-bounded flow (like water along the hulls of ships or air on airplanes) is hindered by a drag, which increases many-folds when the fluid flow turns from laminar to turbulent. A major technological problem is how to reduce this drag in order to minimize the expense of transporting fluids like oil in pipelines, or to move ships in the ocean. It was discovered in the mid-twentieth century that minute concentrations of polymers can reduce the drag in turbulent flows by up to 80%. While experimental knowledge had accumulated over the years, the fundamental theory of drag reduction by polymers remained elusive for a long time, with arguments raging whether this is a "skin" or a "bulk" effect. In this colloquium review we first summarize the phenomenology of drag reduction by polymers, stressing both its universal and non-universal aspects, and then proceed to review a recent theory that provides a quantitative explanation of all the known phenomenology. We treat both flexible and rod-like polymers, explaining the existence of universal properties like the Maximum Drag Reduction (MDR) asymptote, as well as non-universal cross-over phenomena that depend on the Reynolds number, on the nature of the polymer and on its concentration. Finally we also discuss other agents for drag reduction with a stress on the important example of bubbles.

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Section: B Drag Reduction When Polymers Are Degradedsupporting

confidence: 82%

“…13 is that for small Q (actually for Q ≤ 0.5 or %DR ≤ 20), %DR is approximately a linear function of Q. The experiments (Choi et al, 2002) …”

Section: B Drag Reduction When Polymers Are Degradedmentioning

confidence: 85%

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Colloquium: Theory of drag reduction by polymers in wall-bounded turbulence

2008

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“…The DNA molecules can change from their double-stranded state to two single-strands under certain temperature or pH conditions. Based on the above property, Choi et al [98] employed λ-DNA as a drag reducing agent to probe the mechanism of drag reduction and mechanical molecular degradation. They reported that λ-DNA is considered to be a better polymeric DR additive than the high-molecular-weight linear long-chain PEO.…”

Section: Dnamentioning

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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“…J. Choi et al (2002) studied the turbulent drag reduction induced by λ-DNA and compared it with a high molecular weight polyethylene oxide (PEO) (Mw=5 *10 6 ) using rotating disk apparatus (RDA). Moreover, the transient behaviour of the mechanical molecular degradation (MMD) of DNA chains in a turbulent flow was investigated.…”

Section: Drag Reduction Using Rotating Disk Apparatus (Rda)mentioning

confidence: 99%

Rotating Disk Apparatus: Types, Developments and Future Applications

Rashed¹,

Abdulbari²,

Salleh³

et al. 2016

MAS

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Power consumption reduction investigations attracted the attention of enormous numbers of researchers in the past few decades due to its high academic and economic impacts. The pumping power losses during the transportation of crude oils are considered as one of the main power consuming applications due to the turbulent mode of transportation. Investigating the possible solutions for this problem is expensive and time consuming due to the large apparatuses needed to simulate the flow in real pipelines. Rotating disk apparatus (RDA) is an instrument mainly comprising a rotating disk and an electrical motor to rotate the disk, which was implemented as an efficient and economical path to simulate what can be done in pipelines through generating a controlled degree of turbulence. This technique was also used in many other scientific applications due to its dynamic mode of operation. For example, a rotating disk electrode was used in electrodeposition processes and to characterize deposition film thickness and uniformity. The rotating disk reactor was employed to investigate the reaction rate between fluids and solid surfaces. The present work evaluates the RDA from different prospective and applications in order to introduce it as an efficient research tools for future dynamic investigations.

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Turbulent Drag Reduction and Degradation of DNA

Cited by 84 publications

References 19 publications

Colloquium: Theory of drag reduction by polymers in wall-bounded turbulence

Colloquium: Theory of drag reduction by polymers in wall-bounded turbulence

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

Rotating Disk Apparatus: Types, Developments and Future Applications

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