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相关概念视频

Free Jet01:14

Free Jet

190
Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
190
Typical Model Studies01:30

Typical Model Studies

380
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
380
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

222
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
222
Laminar Flow01:27

Laminar Flow

1.1K
Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
1.1K
Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

901
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
901
General External Flow Characteristics01:26

General External Flow Characteristics

226
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
226

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相关实验视频

Updated: Jul 16, 2025

Protocol for Relative Hydrodynamic Assessment of Tri-leaflet Polymer Valves
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门说明书表面图案对门水力动力学性能的影响

Aili Wang1, Yumiao Wang1, Wanbing Liu2

  • 1State Key Laboratory of Cardiovascular Disease, FuWai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China.

The International journal of artificial organs
|September 12, 2023
PubMed
概括

在人工心脏门传单上用平行槽图案改变烧解碳微结构会影响水力动力性能,影响平均压力梯度,有效孔面积和反分数.

关键词:
表面图案的表面图案.心脏门假体 假体血液动力学 血液动力学脉冲复制器的复制器

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相关实验视频

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科学领域:

  • 生物医学工程 生物医学工程
  • 材料科学 材料科学 材料科学
  • 心血管研究研究心血管研究

背景情况:

  • 人工心脏门对于治疗心脏膜疾病至关重要.
  • 氧化碳微结构影响了机械心脏门的性能.
  • 了解这些影响是改善门设计和患者治疗结果的关键.

研究的目的:

  • 为了研究人工心脏门小册子上的 pyrolytic 碳的微结构如何影响它们的水力动力学性能.
  • 评估激光雕刻的平行槽图案对关键血液动力学参数的影响.

主要方法:

  • Bileaflet 机械 (GKS 23 和 29 A) 根据 ISO5840.0 标准进行了测试.
  • 测量了血液动力学参数,包括平均压力梯度 (MPG),排泄率 (RF) 和有效孔径面积 (EOA).
  • 通过激光蚀刻在传单表面创建了一个平行槽图案,并重新测试了门.

主要成果:

  • 平行槽模式改变了MPG,EOA和RF.
  • 一般来说,MPG在模拟后会增加.
  • EOA显示出不同的反应 (在23A中较大,在29A中较小),RF显示出反向关系.
  • 射频在5 L/min (45 bpm) 降低,但在7 L/min (70 bpm) 显示复杂的变化.

结论:

  • 热溶性碳片的表面微结构显著影响人工心脏门的水力动力性能.
  • 平行槽模式提供了一种调节门血液动力学的方法,尽管效果因门大小和流量条件而异.