Design of a Bio-Inspired Anti-Erosion Structure for a Water Hydraulic Valve Core: An Experimental Study

Wang, Haihang; He, X. T.; Zhang, Yonghui; Chen, Siqing; Zhao, Zitong; Chen, Junlong

doi:10.3390/biomimetics4030063

Cited by 14 publications

(8 citation statements)

References 45 publications

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“…Comprehensive analysis shows that these protrusions, spirals, and non-smooth surface morphology can reduce the erosion of sediment. The outer shell of the conch is well protected against abrasion and erosion [ 53 ].…”

Section: Implementation Of the Proposed Methodology And Resultsmentioning

confidence: 99%

Inspection of Biomimicry Approaches as an Alternative to Address Climate-Related Energy Building Challenges: A Framework for Application in Panama

et al. 2020

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In the Panama context, energy consumption in the building sector is mostly related to the conditioning of indoor spaces for cooling and lighting. Different nature strategies can be mimic to strongly impact these two aspects in the building sector, such as the ones presented here. A comprehensive analysis regarding literature related to biomimicry-based approaches destined to improve buildings designs is presented here. This analysis is driven by the increasing energy regulations demands to meet future local goals and to propose a framework for applications in Panama. Such biomimicry-based approaches have been further analyzed and evaluated to propose the incorporation of organism-based design for three of the most climate types found in Panama. Consequently, a SWOT analysis helped realized the potential that biomimicry-based approaches might have in improving the odds of in meeting the local and global regulations demands. The need for multidisciplinary collaboration to accomplish biomimicry-based-designed buildings, brings an increment in the competitivity regarding more trained human-assets, widening the standard-construction-sector thinking. Finally, the analysis presented here can serve as the foundation for further technical assessment, via numerical and experimental means.

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Section: Implementation Of the Proposed Methodology And Resultsmentioning

confidence: 99%

Inspection of Biomimicry Approaches as an Alternative to Address Climate-Related Energy Building Challenges: A Framework for Application in Panama

et al. 2020

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“…The design for three‐level structures of the crystals derived from structural fractal of romanesco broccoli. a) The physical image of romanesco broccoli and its biomimetic mapping [ 20 ] using fractal theory. Reproduced under the terms of the Creative Commons Attribution 4.0 International license.…”

Section: Introductionmentioning

confidence: 99%

“…Reproduced under the terms of the Creative Commons Attribution 4.0 International license. [ 20 ] Copyright 2019, The Author(s), Published by MDPI. b,c) According to the fractal concept in (a), a three‐level structure of crystals similar to structural fractal is designed.…”

Section: Introductionmentioning

confidence: 99%

“…The multi-level micro-nano structure is similar to the fractal structure (Figure 1a), so the higher the number of levels it has, the larger the fracture surface area of ceramics. We designed threelevel structure of crystals based on the fractal theory of romanesco broccoli [20] (Figure 1a). The intergranular fracture of these two three-level micro-nano grains (Figure 1b,c) can increase the The low fracture toughness of equiaxed nanocrystalline ceramics is the main bottleneck of its wide range of commercial applications.…”

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confidence: 99%

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Making Ultra‐Tough Nanoceramics by Columnar Submicrocrystals with Three‐Level Micro‐Nano Structures

Yang

Zheng

Liu

et al. 2022

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leading to the intergranular fracture. The fracture surface area of equiaxed nanocrystalline ceramics is independent of grain size (Figure S1a,b and Equation S3, Supporting Information). Therefore, the total fracture energy (Equation S4, Supporting Information) of brittle ceramics does not change under the invariant interface energy, according to Griffith theory. This is the fundamental reason why the toughness of nanocrystalline ceramics cannot be greatly improved.The toughness of nanoceramics with high-strength can be greatly improved by changing the grain geometry or the way of grain fracture. In the past, high-toughness ceramics were mainly prepared by adding whiskers, [11] fibers, [12] and nanoparticles. [13] Due to the limitation of equilibrium phase transition, these ceramics can only form one-or two-level micro-nano structures (Figure 1b,c), which not only have low-content second-level structure but also cannot achieve three-level structure. In order to prepare high-density ceramics, the whisker content should not exceed 20-30 vol%, [14] and whiskers are damaged during the mixing process, thus limiting the improvement of ceramic toughness. In situ self-generated whiskers or rod-like crystals can not only increase their content up to 30-50 vol%, but also improve the bonding strength between them and the matrix, which greatly exerts their toughening effect. The widely used in situ self-generated β-Si 3 N 4 rod-like microcrystal [15,16] ceramics and Al 2 O 3 ceramics with a small amount of α-Al 2 O 3 columnar microcrystals [17][18][19] can improve the ceramic toughness because of the rod-like/columnar structures. However, most of these ceramics need to add inducer or seeds, and the Si 3 N 4 usually undergo α→β phase transformation, which depends on the equilibrium phase diagram, so the method of rod-like/columnar crystals toughened ceramics is restricted. Through the nonequilibrium phase transformation, the three-level or multi-level structure of high-content nanoparticles, whiskers, rod-like/ columnar crystals, or plate-like crystals can be realized by in situ growth, breaking the limit of the phase diagram. The multi-level structure of ceramics with intergranular fracture will increase the fracture surface area, thereby improving the toughness. The multi-level micro-nano structure is similar to the fractal structure (Figure 1a), so the higher the number of levels it has, the larger the fracture surface area of ceramics. We designed threelevel structure of crystals based on the fractal theory of romanesco broccoli [20] (Figure 1a). The intergranular fracture of these two three-level micro-nano grains (Figure 1b,c) can increase the The low fracture toughness of equiaxed nanocrystalline ceramics is the main bottleneck of its wide range of commercial applications. Here, the authors report a method to overcome this limitation for preparing ultra-tough nanoceramics from using amorphous and supersaturated Al 2 O 3 /ZrO 2 solid solution micro-powders, which is fabricated by Al-O 2 ultrahigh-temperature combustion ...

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“…e cavitation inception, development, and collapse in the flow passage will lead to pressure oscillation in the regulating valve, vibration, noise, early valve failures, and affecting the stability of the hydraulic system [1][2][3]. erefore, it is essential to understand thoroughly the complex flow characteristics inside the valve in order to improve the running safety of the regulating valve [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Study on Unsteady Cavitation Flow and Pressure Pulsation Characteristics in the Regulating Valve

Liu

et al. 2021

Shock and Vibration

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A combined numerical-experiment investigation on the unsteady cavitation flow and pressure fluctuation characteristics in the regulating valves is conducted in this paper. The cavitation flow in the regulating valve is an unsteady and periodic flow which could be divided into fixed and travelling cavitation bubbles. The fixed cavitation bubbles are formed in the gap in the initial stage and then fell off and formed the travelling cavitation bubbles because of the re-entrant jet. The travelling cavitation bubbles move downstream, oscillate, and break up into several smaller bubbles. Changes in the length/radius ratio (L/R0) of the valve spool is an important factor affecting unsteady cavitation flow and pressure pulsation characteristics in the regulating valve. The length of travelling cavitation bubbles increases firstly and then decreases with increasing time. With the increase of the length/radius ratio (L/R0), the oscillation period of cavitation bubbles also increases. In the initial stage of cavitation bubbles, the velocity distribution inside the regulating valve is relatively stable, and no re-entrant jet could be found although L/R0 is different. In the collapse stage of cavitation bubbles, the velocity distribution becomes extremely unstable because the collapsing cavitation bubbles affect the pressure drop and velocity field in the flow channel. Furthermore, the amplitude of pressure pulsation increases gradually, and the peak time of the pressure pulsation is gradually delayed while increasing the length/diameter ratio.

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Design of a Bio-Inspired Anti-Erosion Structure for a Water Hydraulic Valve Core: An Experimental Study

Cited by 14 publications

References 45 publications

Inspection of Biomimicry Approaches as an Alternative to Address Climate-Related Energy Building Challenges: A Framework for Application in Panama

Inspection of Biomimicry Approaches as an Alternative to Address Climate-Related Energy Building Challenges: A Framework for Application in Panama

Making Ultra‐Tough Nanoceramics by Columnar Submicrocrystals with Three‐Level Micro‐Nano Structures

Study on Unsteady Cavitation Flow and Pressure Pulsation Characteristics in the Regulating Valve

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