Drag reduction effects facilitated by microridges inside the mouthparts of honeybee workers and drones

Li, Chuchu; Wu, Jianing; Yang, Yunqiang; Zhu, Rengao; Yan, Shaoze

doi:10.1016/j.jtbi.2015.10.010

Cited by 19 publications

(21 citation statements)

References 38 publications

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“…After millions of years of continuous adaption and evolution, bodies of creatures in nature have formed delicate biological surface structures with drag-reducing characteristics 8 – 11 . For instance, convex hull structures of the head of the dung beetle 12 – 14 , the herringbone riblet textures inspired by the bird feathers 15 , 16 , ridged structures distributed on the mouthpart of the honeybee 17 , 18 , and the super-hydrophobic surface of the skins of many creatures 19 – 22 . In addition, the surface structure of many aquatic animals also had excellent drag-reduction characteristic, which had been applied in many fields and showed great drag-reduction effect.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales

Jiao

Song

et al. 2018

Sci Rep

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Biological surfaces with unique wettability in nature have provided an enormous innovation for scientists and engineers. More specifically, materials possessing various wetting properties have drawn considerable attention owing to their promising application prospects. Recently, great efforts have been concentrated on the researches on wetting-induced drag-reduction materials inspired by biology because of their ability to save energy. In this work, the drag-reduction characteristics of the bionic surface with delicate water-trapping microstructures of fish Ctenopharyngodon idellus scales were explored by experimental method. Firstly, the resistance of smooth surface and bionic surface experimental sample at different speeds was carefully tested through the testing system for operation resistance. Then, the contact angle (CA) of fish scale surface was measured by means of the contact angle measuring instrument. It was discovered that the bionic surface created a rewarding drag-reduction effect at a low speed, and the drag-reduction rate significantly displayed a downward trend with the increase in flow speed. Thus, when the rate was 0.66 m/s, the drag-reduction effect was at the optimum level, and the maximum drag reduction rate was 2.805%, which was in concordance with the simulated one. Furthermore, a contact angle (CA) of 11.5° appeared on the fish scale surface, exhibiting fine hydrophilic property. It further manifested the spreading-wetting phenomenon and the higher surface energy for the area of apical of fish scales, which played an important role in drag-reduction performance. This work will have a great potential in the engineering and transportation field.

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Section: Introductionmentioning

confidence: 99%

Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales

Jiao

Song

et al. 2018

Sci Rep

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show abstract

“…Given that lubrication is essential for the articulation, the protuberances may help to reduce drag and friction. In analyzing the lubrication effect of this specialized structure, we proposed a hydrodynamic model of Reynolds blocks and considered the protuberances according to Reynolds equations (Li et al 2016). …”

Section: Resultsmentioning

confidence: 99%

Drag Reduction in a Natural High-Frequency Swinging Micro-Articulation: Mouthparts of the Honey Bee

Shi

Yan

2017

Journal of Insect Science

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Worker-bee mouthparts consist of the glossa, the galeae and the vestigial labial palp, and it is these structures that enable bees to feed themselves. The articulation joints, 60∼70 µm in diameter, are present on the tip of the labial palp and are covered with olfactory sensilla, allowing movements between the segments. Using a specially designed high-speed camera system, we discovered that the articulation joint could swing in the nectar at a frequency of ∼50 Hz, considerably higher than the usual motion frequency of mammalian joints. To understand the potential drag reduction in this tiny organ, we examined its microstructure and also its surface wettability. We found that chitinous semispherical protuberances (4∼6 µm in diameter) are uniformly scattered on the surface of the joint and, moreover, that the surface is hydrophobic. We proposed a hydrodynamic model and revealed that the specialized surface can effectively reduce the mean equivalent friction (Ff) by ∼10%, through the use of protuberances immersed in the liquid feed. Theoretical results indicated that the dimensions of such protuberances are the predominant factor in minimizing Ff, and that the natural dimensions of the protuberances are close to the theoretical optimum at which friction is at a minimum. These discoveries may inspire the design of high-frequency micro-joints for engineering applications, such as in micro-stirrers.

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“…The drone operates remotely, ranging in size from a small object of centimeter such as an insect (civil purposes) to a plane with its wings of about 100 meters (military purposes) [23,24]. These unmanned aerial vehicles (UAVs) operate on air, in addition to the presence of many drones operating on land and water [25,26].…”

Section: Dronesmentioning

confidence: 99%

Spreading Code Identification of Legal Drones in IoT Environment

Alheeti

Al-Ani

McDonald-Maier

2019

2019 Eighth International Conference on Emerging Security Technologies (EST)

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The widespread use of drones has become very common today with large-scale civil and military applications. In the next few coming years, the outlook is expected that the number of drones will reach millions. So, these need to be well organised and managed in order to achieve the benefits of IoT with this accelerated environment. Drones or Unmanned Aerial Vehicles (UAVs) must achieved a level of communications to authenticate a legal working. The proposed approach concentrated on preparing each drone with identification key based on the combination of its international sim number with the date of the first action and the local country code. This approach is called Drone IDentification (DID) that generate a unique code for each drone via spreading technique. In this case any drone not apply this regulation is considered as unauthenticated drone and does not allowed to fly. This approach is very important to establish drone regulation via IoT.

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Drag reduction effects facilitated by microridges inside the mouthparts of honeybee workers and drones

Cited by 19 publications

References 38 publications

Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales

Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales

Drag Reduction in a Natural High-Frequency Swinging Micro-Articulation: Mouthparts of the Honey Bee

Spreading Code Identification of Legal Drones in IoT Environment

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