Bioinspired Universal Approaches for Cavity Regulation during Cylinder Impact Processes for Drag Reduction in Aqueous Media: Macrogeometry Vanquishing Wettability

Yao, Changzhuang; Yinqing, Zhou; Wang, Jingming; Jiang, Lei

doi:10.1021/acsami.1c06846

Cited by 11 publications

(8 citation statements)

References 52 publications

(64 reference statements)

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“…32 Hydrophilicity is an important feature that influences cell attachment, migration, and viability. 33 Our hydrophilicity measurements showed that both 2D and 3D conduits had reasonable hydrophilicity, but especially the 3D ones (Figure 2B).…”

Section: Resultsmentioning

confidence: 70%

“…One possible reason is that the characteristic absorption band of imine (CN) formed by cross-linking reaction overlapped with the strong absorption band of the amide I in SF . Hydrophilicity is an important feature that influences cell attachment, migration, and viability . Our hydrophilicity measurements showed that both 2D and 3D conduits had reasonable hydrophilicity, but especially the 3D ones (Figure B).…”

Section: Resultsmentioning

confidence: 89%

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In Situ Prevascularization Strategy with Three-Dimensional Porous Conduits for Neural Tissue Engineering

Shen

Wang

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Neovascularization is crucial for peripheral nerve regeneration and long-term functional restoration. Previous studies have emphasized strategies that enhance axonal repair over vascularization. Here, we describe the development and application of an in situ prevascularization strategy that uses 3D porous nerve guidance conduits (NGCs) to achieve angiogenesis-mediated neural regeneration. The optimal porosity of the NGC is a critical feature for achieving neovascularization and nerve growth patency. Hollow silk fibroin/ poly(L-lactic acid-co-ε-caprolactone) NGCs with 3D sponge-like walls were fabricated using electrospinning and freeze-drying. In vitro results showed that 3D porous NGC favored cell biocompatibility had neuroregeneration potential and, most importantly, had angiogenic activity. Results from our mechanistic studies suggest that activation of HIF-1α signaling might be associated with this process. We also tested in situ prevascularized 3D porous NGCs in vivo by transplanting them into a 10 mm rat sciatic nerve defect model with the aim of regenerating the severed nerve. The prevascularized 3D porous NGCs greatly enhanced intraneural angiogenesis, resulting in demonstrable neurogenesis. Eight weeks after transplantation, the performance of the prevascularized 3D NGCs was similar to that of traditional autografts in terms of improved anatomical structure, morphology, and neural function. In conclusion, combining a reasonably fabricated 3D-pore conduit structure with in situ prevascularization promoted functional nerve regeneration, suggesting an alternative strategy for achieving functional recovery after peripheral nerve trauma.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 89%

In Situ Prevascularization Strategy with Three-Dimensional Porous Conduits for Neural Tissue Engineering

Shen

Wang

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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“…Reduction of fluid resistance is of significance to increasingly emerging energy and environmental issues. − Turbulence is the major source of fluid resistance in many cases and has attracted extensive attention. − Hence, research into drag reduction has focused on methods to depress turbulence near walls. − Biomimetic riblet surfaces, such as blade, wavy, sinusoidal, and herringbone riblet (Blade, Wavy, Sinusoidal, and Herringbone, respectively) surfaces, inspired by sharks and birds have achieved significant reductions in turbulent drag reduction. Blade surfaces have been proven to provide obvious drag reduction, and they have shown promise for many potential applications in the pipeline, aircraft, energy, and transportation industries. ,− …”

Section: Introductionmentioning

confidence: 99%

Effects of the Yaw Angle on Air Drag Reduction for Various Riblet Surfaces

Zhou

Yan

et al. 2022

Langmuir

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Biomimetic riblet surfaces, such as blade, wavy, sinusoidal, and herringbone riblet surfaces, have widespread applications for drag reduction in the energy, transportation, and biomedicine industries. The drag reduction ability of a blade riblet surface is sensitive to the yaw angle, which is the angle between the design direction of the riblet surface and the average flow direction. In practical applications, the average flow direction is often misaligned with the design direction of riblet surfaces with different morphologies and arrangements. However, previous studies have not reported on the drag reduction characteristics and regularities related to the yaw angle for surfaces with complex riblet microstructures. For the first time, we systematically investigated the aerodynamic drag reduction characteristics of blade, wavy, sinusoidal, and herringbone riblet surfaces affected by different yaw angles. A precisely adjustable yaw angle measurement method was proposed based on a closed air channel. Our results revealed the aerodynamic behavior regularities of various riblet surfaces as affected by yaw angles and Reynolds numbers. Riblet surfaces with optimal air drag reduction were obtained in yaw angles ranging from 0 to 60°and Reynolds numbers ranging from 4000 to 7000. To evaluate the effects of the yaw angle, we proposed a criterion based on the actual spanwise spacing (d + ) of microstructure surfaces with the same phase in a near-wall airflow field. Finally, we established conceptual models of aerodynamic behaviors for different riblet surfaces in response to changes in the airflow direction. Our research lays a foundation for practical various riblet surface applications influenced by yaw angles to reduce air drag.

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“…[3,4] Consequently, for hydrodynamic drag reduction, it is essential to reduce the form of drag on a blunt body.The innovative approach of form drag reduction is realized by changing the shape of the blunt body to a streamlined body through introducing a cavity. [3][4][5][6][7] The cavity can be generated by the principle of natural cavitation on underwater objects because the water near the head of the object is vaporized to generate cavitation when the speed of the object is high enough. [8,9] However, at low speeds, the cavity greatly depends on the air-capture process when the object impacts the water surface.…”

mentioning

confidence: 99%

“…On a blunt body, the form of drag underwater is much greater than the skin friction. [3,4] Consequently, for hydrodynamic drag reduction, it is essential to reduce the form of drag on a blunt body.…”

mentioning

confidence: 99%

Bioinspired Drag Reduction of Cavities Induced by Janus Nanostructure Interfaces on Hydrophobic Spheres Plunging into Water with a Low Speed

Xie

Yao

Shi

et al. 2023

Adv Materials Inter

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forces are always experienced. Thus, hydrodynamic drag reduction is crucial for avoiding speed loss and improving energy efficiency. [1] In general, there are two main forms of hydrodynamic drag resistance, i.e., skin friction (friction drag force) and the form drag force. Skin friction is the friction between a fluid and the surface of a solid moving through it or between a moving fluid and its enclosing surface as a result of fluid viscosity. Skin friction is the key factor for a streamlined body, such as a submarine or torpedo. [2] Form drag occurs from the pressure difference due to the physical dimensions of the object obstructing and altering the flow of the fluid (i.e., flowseparation phenomena). On a blunt body, the form of drag underwater is much greater than the skin friction. [3,4] Consequently, for hydrodynamic drag reduction, it is essential to reduce the form of drag on a blunt body.The innovative approach of form drag reduction is realized by changing the shape of the blunt body to a streamlined body through introducing a cavity. [3][4][5][6][7] The cavity can be generated by the principle of natural cavitation on underwater objects because the water near the head of the object is vaporized to generate cavitation when the speed of the object is high enough. [8,9] However, at low speeds, the cavity greatly depends on the air-capture process when the object impacts the water surface. [10,11] If the water disturbance and water splashing outward along the object create an open splash crown for air to enter during the impacting process, more air is drawn into the cavity with the object continuously falling. Then, due to the hydrostatic pressure of the surrounding water and the capillary force, the middle of the cavity gradually shrinks until it is clipped, and then a streamlined cavity form. [12] The behavior of water regulation on the object interfaces (i.e., water disturbance and water splashing outward) is significantly relayed on the characteristics of the object interface, including wettability, [13][14][15] microstructure, [16,17] and surface energy distribution. The static unwetted interfaces, such as the superhydrophobic [18][19][20][21][22][23][24][25] and Leidonfrost [26][27][28][29] interfaces, prevent water from penetrating the space between the microscale and/or nanoscale structures, leading to a Cassie-Baxter wetting regime and then water splashing outward. A superhydrophobic interface is generally characterized by low surface free energy Form drag of the blunt object occurs from the pressure difference due to the physical dimensions of the object obstructing and altering the flow of the fluid. The innovative approach of form drag reduction is real ized by changing the shape of the blunt object to a streamlined body by introducing a cavity. The construction of superhydrophobic interfaces is widely considered as the best solution for introducing a cavity, because water is prevented from penetrating the space between the nanoscale structures, leading to a Cassie-Baxter wetting regime and the...

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Bioinspired Universal Approaches for Cavity Regulation during Cylinder Impact Processes for Drag Reduction in Aqueous Media: Macrogeometry Vanquishing Wettability

Cited by 11 publications

References 52 publications

In Situ Prevascularization Strategy with Three-Dimensional Porous Conduits for Neural Tissue Engineering

In Situ Prevascularization Strategy with Three-Dimensional Porous Conduits for Neural Tissue Engineering

Effects of the Yaw Angle on Air Drag Reduction for Various Riblet Surfaces

Bioinspired Drag Reduction of Cavities Induced by Janus Nanostructure Interfaces on Hydrophobic Spheres Plunging into Water with a Low Speed

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