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首页> 外文会议>SPIE Conference on Bioinspiration, Biomimetics, and Bioreplication >Spitting cobras - fluid jets in nature as models for technical applications
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Spitting cobras - fluid jets in nature as models for technical applications

机译：随着技术应用的模型，随着COBRAS - 流体喷射器作为技术应用

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Spitting cobras defend themselves by ejecting rapid jets of venom through their fangs towards the face of an offender. To generate these jets, the venom delivery system of spitting cobras has some unique adaptations, such as prominent ridges on the surface of the venom channel. We examined the fluid acceleration mechanisms in three spitting cobra species of the genus Naja. To investigate the liquid-flow through the venom channel we built a three-dimensional 60:1 scale model. First we determined the three-dimensional structure of the channel by using microcomputer tomography. With help of the micro computer tomographical data we then created a negative form out of wax. Finally, silicon was casted around the wax form and the wax removed, resulting in a completely transparent model of the cobra's venom channel. The physical-chemical properties of the cobra venom were measured by micro rheometry and tensiometry. Thereafter, an artificial fluid with similar properties was generated. Particle image velocimetry (PIV) was performed to visualize the flow of the artificial liquid in the three-dimensional model. Our experiments show how the surface structure of the venom channel determines the liquid flow through the channel and ultimately the form of the liquid jet. Understanding the biological mechanisms of venom ejection helps to enhance industrial processes such as water jet cutting and cleaning as well as injection methods in technical and medical sectors, e.g. liquid microjet dissection in microsurgery.
机译：吐痰COBRAS通过将毒液的快速喷射通过他们的尖牙朝向罪犯来防御自己。为了产生这些喷气机，吐痰蜘蛛活的毒液输送系统具有一些独特的适配，例如毒液通道表面上的突出脊。我们检查了Naja属的三种吐痰COBRA种类中的流体加速机制。通过毒液通道研究液体流动，我们建立了三维60：1比例模型。首先，我们通过使用微型计算机断层扫描确定了通道的三维结构。随着微型计算机的帮助，我们将创造出蜡的负面形式。最后，在蜡形式周围浇铸硅并除去蜡，导致眼镜蛇的毒液通道的完全透明模型。通过微流动学计量和张力测量眼镜蛇毒液的物理化学性质。此后，产生具有相似性质的人造液。进行粒子图像测速法（PIV）以在三维模型中可视化人工液体的流动。我们的实验表明了毒液通道的表面结构如何确定流过通道的液体，并最终是液体射流的形式。理解毒液喷射的生物机制有助于提高工业过程，如水射流切割和清洁以及技术和医学领域的注射方法，例如，显微外科的液体微目觉剖析。

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