A Numerical Study on Pressure Drop in Microchannel Flow with Different Bionic Micro-Grooved Surfaces

Chen, Jing; Fu, Yabo

doi:10.1016/s1672-6529(11)60102-9

Cited by 46 publications

(20 citation statements)

References 23 publications

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“…Bechert et al [87] observed that the riblets should have finer lateral spacing than the spacing of the streamwise vortices but failed to address the mechanism behind this. It was later shown that the reason is that with larger riblet spacing there were more instances of vortical structures invading the riblet valleys resulting in increased drag [89]. The invasion of near wall structures into riblet grooves was previously accepted as a random event that could not be controlled and had a constant and uncontrollable effect on the drag reduction efficiency.…”

Section: Ribletsmentioning

confidence: 99%

“…Again it must be emphasized that results of this order are to be expected for drag reduction over ribletted walls. Cui and Fu [89], carried out a numerical investigation for four types of bionic surfaces, placoid-shaped, V-shaped, riblet-shaped, and ridgeshaped grooved surfaces, as the micro-channel surfaces to reduce drag. The numerical investigation used Boltzmann method (which was proven earlier by Ding et al [90] as an effective numerical method to investigate the velocity profiles over different kinds of non-smooth surfaces).…”

Section: Ribletsmentioning

confidence: 99%

See 1 more Smart Citation

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: Ribletsmentioning

confidence: 99%

Section: Ribletsmentioning

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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“…Based on the theory of fluid dynamics, the laminar flow offers the lowest attainable wall shear stress, whereas the turbulent flow increases the wall shear stress, thereby increasing the skin friction drag. This skin friction drag in a turbulent flow is approximately 10 times greater than that generated in laminar boundary layer flows 35. Owing to the relatively high Reynolds number of a fast‐swimming aquatic animal or fast‐moving object in a fluid, a turbulent flow will occur, which will lead to the generation of counter‐rotating vortices that increase the drag.…”

Section: Mechanism Of Shark Skin Drag Reductionmentioning

confidence: 98%

Progress and Perspective of Studies on Biomimetic Shark Skin Drag Reduction

Liu

2016

ChemBioEng Reviews

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Shark skin surfaces of fast-swimming sharks are characterized as non-smooth because of the presence of dermal denticles or riblet structures and exhibit an excellent drag-reduction effect. A review of the surface morphology, structure and mechanical behaviors of shark skin is given. Investigations into the microstructures of a single denticle and the mechanical behaviors of complete fresh shark skin containing both epidermal and dermal layers were reported. The results show that some nanostructured protuberances exist on the concave groove surface of a denticle. In particular, the complete fresh shark skin exhibits an excellent elasticity, and its stress-strain curve is different from that of the corresponding epidermal layer. Furthermore, the mechanisms of drag reduction by riblets and complaint wall were introduced, various methods of fabricating biomimetic riblet-structured surfaces were classified and summarized, and studies on the drag-reduction effects and applications of biomimetic riblet-structured surfaces were also reviewed. Based on these analyses and on the understanding of the drag-reduction mechanisms, the concept of a synergistic drag-reduction effect that is attributed to a non-smooth surface and an elastic matrix was proposed for the first time.

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“…The analysis shows that the non-smooth structural characteristics of the livings' surface morphology can change the flow. Cui et al [9] considered four types of bionic surfaces of reducing pressure loss, which were riblet-shaped, ridge-shaped, V-shaped, and placoid-shaped, respectively. Using the Lattice Boltzmann Method (LBM), an order for drag reduction coefficient (η) was generated, as follows:…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Designed for Bionic Surfaces with Rib Turbulators Inspired by Alopias Branchial Arch in a Simplified Gas Turbine Transition Piece

Guo

Liang

et al. 2018

Applied Sciences

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Abstract:The energy needed for highly efficient heat transfer has shown a continuous growth, as the energy reduction. For highly efficient power convection, gas turbine is an important device at present. But, the design of highly efficient gas turbine is limited by the temperature and the material's temperature resistance around the inlet. One part of the inlet need to be protected from burning out is transition piece. A bionic thermal surface with rib turbulators is designed according to the turbulence function of alopias' branchial arches and is evaluated for thermo-protection enhancement in a simplified gas turbine transition piece using computational fluid dynamics (CFD) simulation. With the given diameter (Φ = 10.26 mm) of the impinging hole, three different horizontal distances (S) from impinging holes to the front of first-row rib were solved, which were S 1 = 20 mm, S 2 = 40 mm, and S 3 = 60 mm, respectively, in case 1. But, the results revealed that S is not a significant influence factor on heat transfer efficiency. The cooling coefficient increases from 0.194 to 0.198 when the distance varies from S 1 to S 3 . In case 2, rib turbulator width (W) and height (H) have been studied in ranges from 0.5 × Φ to 1.5 × Φ. All of the numerical results indicated that the best size of the rib turbulators could improve the heat transfer efficiency to 32.5%, when comparing with the smooth surface. All of the comparisons will benefit the structural design of heat transfer, which could be used for solving more severe problems in thermo-protection.

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A Numerical Study on Pressure Drop in Microchannel Flow with Different Bionic Micro-Grooved Surfaces

Cited by 46 publications

References 23 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

Progress and Perspective of Studies on Biomimetic Shark Skin Drag Reduction

Heat Transfer Designed for Bionic Surfaces with Rib Turbulators Inspired by Alopias Branchial Arch in a Simplified Gas Turbine Transition Piece

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