Effect of Reynolds number on drag reduction in turbulent boundary layer flow over liquid–gas interface

Li, Hongyuan; Ji, Songsong; Tan, Xiangkui; Li, Zigang; Xiang, Yaolei; Lv, Pengyu; Duan, Huiling

doi:10.1063/5.0027727

Cited by 42 publications

(14 citation statements)

References 69 publications

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“…This diminishing effect aligns with the relationship between drag reduction and the ratio between slip velocity and mean flow velocity suggested by Li et al. [ 43 ] Furthermore, the slip length of OEMs is comparable to the studies of SHS [ 44 ] and SLIPS, [ 45 ] suggesting that OEMs offer a promising direction for drag reduction.…”

Section: Resultssupporting

confidence: 86%

Multifunctional Oil‐Entangled Matrix Spray for Maritime Sustainability

Sin,

Chung,

et al. 2023

Adv Materials Technologies

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Maritime transport, as the backbone of international trade, contributes to 3% of global greenhouse gas emissions. One major challenge to the sustainability of marine shipping is the fuel consumption associated with flow resistance to ship hulls. While passive approaches like superhydrophobic or lubricant‐infused surfaces hold promise for drag reduction, their scalability, stability, and durability are limited, particularly in oceanic scenarios. Here, an oil‐entangled matrix spray (OEMs) coating is developed to overcome the limitations of conventional surface modification. To create a drag‐reduction surface, liquid lubricant is rationally integrated with a polymer matrix, enabling the firm retention of the lubricant while maintaining high adhesion to various substrates. The resulting slippery interface achieves up to 48% drag reduction compared to an unmodified surface in a water tunnel test. Additionally, the hydrophobic, chemically inert, smooth, and slippery interface of OEMs enables multifunction of the coated substrates, including corrosion resistance to seawater and acid, reduced frosting accretion (by up to 68%), and low shear adhesion to ice (<11 kPa). Furthermore, the OEMs provides a universal platform to integrate customized functions such as photothermal effects, further enhancing interface performances by synergizing solar thermal energy and surface slipperiness. This study presents a promising surface modification strategy for improving the sustainability of marine vehicles where scalable, durable, and multifunctional surfaces are desired to achieve sustainable drag reduction under oceanic cruising and extreme weather conditions.

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Section: Resultssupporting

confidence: 86%

Multifunctional Oil‐Entangled Matrix Spray for Maritime Sustainability

Sin,

Chung,

et al. 2023

Adv Materials Technologies

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“…Therefore, the drag reduction rate can be calculated by measuring the field. [196] In addition, further processing of the velocity field can obtain the distribution of flow field characteristic parameters such as vorticity, number of vortices, fluctuating velocity, and Reynolds stress, so as to explore the drag reduction mechanism of microstructures. [153,197,198] Moreover, the movement of a fluid can be observed by PIV, such as the generation and propagation of vortex rings.…”

Section: Pivmentioning

confidence: 99%

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

et al. 2021

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After a long period of biological evolution, natural creatures will inevitably evolve body surfaces suitable for the living environment. The functions of natural biological surfaces are abundant and powerful, including antiadhesion, self‐cleaning, drag reduction, anti‐icing, wear resistance, and other characteristics. In the context of coping with the energy crisis, inspired by natural biological surface microstructures, researchers explore biomimetic surface microstructures that reduce fluid drag and investigate the mechanisms of drag reduction. Herein, mainly the current state of research on biomimetic textured surfaces that can be applied to fluid drag reduction is reviewed and the microstructures’ morphology, drag reduction mechanisms, and the fabrication techniques of textured surfaces are discussed in detail. In particular, the experimental methods for measuring the drag reduction effect of textured surfaces are introduced, which is extremely rare. The article concludes with a summary of existing problems and future directions in the research of biomimetic surface drag reduction technology. This Review can provide a reference for practical application and laboratory research of drag reduction in marine transportation, military weapons, aviation, and pipeline systems.

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“…Chemical self-cleaning surfaces with photocatalytic activity can facilitate the chemical breakdown of organic pollutants, resulting in the production of small molecules such as carbon dioxide and water. [13][14][15] Thus, superhydrophobic NBSSs that exhibit photocatalytic activity can repel liquids and also degrade organic pollutants. MnO 2 is a commonly used photocatalyst that has received widespread attention in various research areas due to its remarkable electrochemical properties, large active surface area, high charge transfer rate, non-toxicity, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Photocatalytic Self‐Cleaning Nanocellulose‐Based Strain Sensor for Full‐Range Human Motion Monitoring

Yin,

Chen,

Chen

et al. 2023

Adv Materials Inter

Self Cite

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Nanocellulose‐based strain sensor (NBSS) have been a subject of growing interest for wearable electronics. However, these electronic devices are susceptible to damage when they come into contact with water and organic contaminants. Recently, researchers have developed a superhydrophobic NBSS. Unfortunately, it does not treat organic pollutants in water when used in an underwater environment. In this paper, a new solution: a superhydrophobic photocatalytic self‐cleaning NBSS created through scrape coating and dip coating methods is proposed. This new method shows outstanding self‐cleaning capabilities against water and organic contaminants due to the synergistic effects of the superhydrophobicity and photocatalysis of MnO2 nanoparticles. Furthermore, the superhydrophobic photocatalytic self‐cleaning NBSS has an exceptional response time of 0.66 s, a fast recovery time of 0.81 s, a sensitivity ≈66.53 at a strain of 0.5%. It is expect that the superhydrophobic photocatalytic self‐cleaning NBSS can monitor human movements, including finger twists, wrist movements, elbow bends, and knee movements. Not only is the fabrication method cost‐effective and scalable, but the new NBSS holds great promise in a wide range of fields, including human‐machine interactive systems, smart systems, and human‐body monitoring. Overall, the study provides significant guidance for future designs for wearable strain sensors.

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Effect of Reynolds number on drag reduction in turbulent boundary layer flow over liquid–gas interface

Cited by 42 publications

References 69 publications

Multifunctional Oil‐Entangled Matrix Spray for Maritime Sustainability

Multifunctional Oil‐Entangled Matrix Spray for Maritime Sustainability

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

Superhydrophobic Photocatalytic Self‐Cleaning Nanocellulose‐Based Strain Sensor for Full‐Range Human Motion Monitoring

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