Asymmetric fluid flow in helical pipes inspired by shark intestines

Unlike human intestines, which are long, hollow tubes, the intestines of sharks and rays contain interior helical structures surrounding a cylindrical hole. One function of these structures may be to create asymmetric flow, favoring passage of fluid down the digestive tract, from anterior to posterior. Here, we design and 3D print biomimetic models of shark intestines, in both rigid and deformable materials. We use the rigid models to test which physical parameters of the interior helices (the pitch, the hole radius, the tilt angle, and the number of turns) yield the largest flow asymmetries. These asymmetries exceed those of traditional Tesla valves, structures specifically designed to create flow asymmetry without any moving parts. When we print the biomimetic models in elastomeric materials so that flow can couple to the structure’s shape, flow asymmetry is significantly amplified; it is 7-fold larger in deformable structures than in rigid structures. Last, we 3D-print deformable ver..., , , # Asymmetric fluid flow in helical pipes inspired by shark intestines

[https://doi.org/10.5061/dryad.4j0zpc8mt](https://doi.org/10.5061/dryad.4j0zpc8mt)

This dataset supplements our paper \"Asymmetric fluid flow in helical pipes inspired by shark intestines\", and includes all the results needed to support our conclusions.
It contains all 3D structures (in STL format) of the helical pipes used in the paper and all our measurements of their hydraulic properties (in CSV format).

## Description of the data and file structure

**STL files:**

* **Biomimetic helical pipes**: The filename of each STL file is formatted as \"SimplifiedModel_*[Rigid/Soft]*_p[pitch values]*_rHole*[hole radius]*_a*[angle tangent]*_nTurn]*.STL\".
Note that Rigid / Soft models are identical, and this tag was added to indicate the soft (deformable) pipes used in this study.
There are a total of 26 rigid pipe models and 4 soft pipe models.
* **Deformed helical pipes**: the deformed inner helical membranes (under a ...,

与人类肠道呈细长中空管状结构不同，鲨鱼和鳐鱼的肠道内部带有环绕圆柱形空腔的螺旋状内部结构。这类结构的功能之一或是产生不对称流场，助力流体沿消化道从前至后定向流动。
本研究设计并采用刚性与弹性材料3D打印了鲨鱼肠道的仿生模型。我们利用刚性模型测试了内部螺旋结构的哪些物理参数——螺距、空腔半径、倾斜角与螺旋匝数——可产生最大的流动不对称性。这类不对称性优于传统的特斯拉阀（Tesla Valve）——一种专为无需运动部件即可实现流动不对称而设计的结构。
当我们使用弹性体材料打印仿生模型，使流场能够与结构形变耦合时，流动不对称性得到显著放大：可形变结构中的不对称性是刚性结构的7倍。最后，我们3D打印了可形变的[原文此处截断]……
# 受鲨鱼肠道启发的螺旋管道内不对称流体流动
https://doi.org/10.5061/dryad.4j0zpc8mt
本数据集为论文《受鲨鱼肠道启发的螺旋管道内不对称流体流动》提供补充支持，包含支撑研究结论所需的全部结果。其中涵盖论文中使用的所有螺旋管道3D结构文件（格式为STL），以及我们测得的全部水力特性数据（格式为CSV）。
## 数据与文件结构说明
**STL文件：**
* **仿生螺旋管道**：每个STL文件的命名格式为"SimplifiedModel_*[Rigid/Soft]*_p[pitch值]_rHole*[空腔半径]_a*[倾斜角]_nTurn]*.STL"。
注：刚性与柔性模型的结构完全一致，该标签仅用于标识本研究中使用的可形变柔性管道。本研究共包含26个刚性管道模型与4个柔性管道模型。
* **形变螺旋管道**：受流体作用发生形变的内部螺旋膜（原文未完成）……