Robust design of microbubble drag reduction in a channel flow using the Taguchi method

Wu, Shukun; Ouyang, Kwan; Shiah, Sheau-Wen

doi:10.1016/j.oceaneng.2008.01.022

Cited by 22 publications

(15 citation statements)

References 16 publications

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“…The deformable properties of bubbles have led researchers to believe that the absorption of turbulent energy is also a central mechanism for DR but the specifics are still unclear. Recently Wu et al [142] observed using visual techniques that bubbles oscillated in the boundary layer and hypothesized that this is likely due to interactions with near wall vertical structures. These findings highlight the complexity involved in quantifying the effect of microbubbles on DR.…”

Section: Microbubblesmentioning

confidence: 99%

Going against the flow—A review of non-additive means of drag reduction

Abdulbari

Yunus

Abdurahman

et al. 2013

Journal of Industrial and Engineering Chemistry

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Section: Microbubblesmentioning

confidence: 99%

Going against the flow—A review of non-additive means of drag reduction

Abdulbari

Yunus

Abdurahman

et al. 2013

Journal of Industrial and Engineering Chemistry

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“…Kodama [118] studied the effect of microbubbles on skin friction reduction in pipe flow, and reported DR up to 40%. Wu et al [119] managed to get 21.6% microbubbles DR in a channel flow.…”

Section: Microbubblesmentioning

confidence: 99%

“…• Mechanisms of microbubbles DR and quantification of its effect on DR are complex and inadequately understood [109,119].…”

Section: August 2015mentioning

confidence: 99%

Reviews on drag reducing polymers

Tiong

Perumal

2015

Korean J. Chem. Eng.

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Polymers are effective drag reducers owing to their ability to suppress the formation of turbulent eddies at low concentrations. Existing drag reduction methods can be generally classified into additive and non-additive techniques. The polymer additive based method is categorized under additive techniques. Other drag reducing additives are fibers and surfactants. Non-additive techniques are associated with the applications of different types of surfaces: riblets, dimples, oscillating walls, compliant surfaces and microbubbles. This review focuses on experimental and computational fluid dynamics (CFD) modeling studies on polymer-induced drag reduction in turbulent regimes. Other drag reduction methods are briefly addressed and compared to polymer-induced drag reduction. This paper also reports on the effects of polymer additives on the heat transfer performances in laminar regime. Knowledge gaps and potential research areas are identified. It is envisaged that polymer additives may be a promising solution in addressing the current limitations of nanofluid heat transfer applications.

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“…Murai et al (2007) experimentally investigated skin friction drag reduction in a horizontal rectangular channel by bubbles that are large relative to the shear layer. Wu et al (2008) attempted to find the optimum parameters for robust design of the microbubble drag reduction in turbulent channel flow. Deutsch and Castano (1985) studied the injection of gas to form microbubbles in turbulent boundary layer in water tunnel tests to reduce skin friction drag on an axisymmetric body.…”

Section: Literaturementioning

confidence: 99%

CFD Study of Drag Reduction in Axisymmetric Underwater Vehicles using Air Jets

Shereena

Vengadesan

Idichandy

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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A computational fluid dynamics approach to study drag reduction of axisymmetric underwater bodies by air jet injection in the boundary layer is presented. The well-known 'mixture' model is used to capture the multiphase flow and the SST k-ω (shear stress transport) turbulence closure model has been used in the computations. Well-studied Afterbody1 (Huang et al., 1978) which has a tapered and smooth stern profile is considered. A companion shape of Afterbody1, which has a blunt stern profile, is also studied. The numerical study is carried out with different air jet velocity to body velocity ratios, various angles of air jet and various angles of attack of the body. Effects of these parameters on drag reduction are reported. The effect of tapered vs. blunt aft shape of Afterbody1 has been found to have significant effect on drag reduction performance.

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Robust design of microbubble drag reduction in a channel flow using the Taguchi method

Cited by 22 publications

References 16 publications

Going against the flow—A review of non-additive means of drag reduction

Going against the flow—A review of non-additive means of drag reduction

Reviews on drag reducing polymers

CFD Study of Drag Reduction in Axisymmetric Underwater Vehicles using Air Jets

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