相关实验视频

Updated: May 31, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Published on: July 19, 2016

参数搜索最佳通道形状,以在心脏和主要血管中旋转血液流动

Ya E Zharkov¹, A V Agafonov¹, Alex Y Gorodkov²

¹Bakulev National Medical Research Center for Cardiovascular Surgery, Moscow, Russia.

Doklady. Biochemistry and biophysics

|January 23, 2025

概括

这项研究优化了道设计,以实现高效的旋转流,这对于生物医学应用至关重要. zR^2=Const轮和7毫米的圆顶高度最大限度地减少能量损失,提高流量均性,模仿自然的循环系统.

科学领域:

流体动力学流体动力学
生物机械工程生物机械工程
数字模拟数字模拟

背景情况:

了解复杂的流体流动在诸如心血管研究等领域至关重要.
道几何学显著影响流动动力学,影响效率和能量损失.
以前的模型往往简化了通道配置文件,限制了对复杂生物系统的适用性.

研究的目的:

通过数值研究各种纵向-半径轮 (zR^N = Const) 和圆顶高度的通道中的流量结构.
为了确定最佳的通道几何,以实现高效的中心心旋旋流.
为了确定条件,尽量减少能量损失,并确保均的速度梯度,类似于血液流动.

主要方法:

使用稳定状态模拟进行数值参数调查.
在不同的通道配置 (不同的N和圆顶高度) 中对流量结构进行比较分析.
对 Burgers' vortex 的分析解决方案进行验证.

主要成果:

zR^2 = Const通道配置文件显示了旋转流的最佳条件,其特点是最小的特定损失和均的速度梯度.
这种配置显示出与 Burgers' vortex 的分析解决方案有很强的一致性.
确定了7毫米的最佳圆顶高度,进一步增强旋转流量并减少粘性损失.

结论:

这种zR^2 = Const通道形状对于产生最佳的中心心旋旋流非常有效.
道底部的7毫米球形圆顶通过减少损失和提高均性,显著改善了流动特性.
这些发现为需要高效旋转流量的应用提供了经过几何优化的设计,例如在生物医学设备中.

关键词:

流量道形状流量道形状心脏和血管形状的近似值.旋转的血液流动.粘性摩擦损失粘性摩擦损失流动的流动的流动

更多相关视频

Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression

Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression

Published on: January 15, 2022

Development and Evaluation of 3D-Printed Cardiovascular Phantoms for Interventional Planning and Training

Development and Evaluation of 3D-Printed Cardiovascular Phantoms for Interventional Planning and Training

Published on: January 18, 2021

相关概念视频

Bernoulli's Equation for Flow Normal to a Streamline

Bernoulli's Equation for Flow Normal to a Streamline

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.

Laminar and Turbulent Flow

Laminar and Turbulent Flow

Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...

Uniform Depth Channel Flow

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...

Blood Flow

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.

Autoregulation of Blood Flow

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....

Rapidly Varying Flow

Rapidly Varying Flow

Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...