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相关概念视频

Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

8.2K
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...
8.2K
Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

219
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
219
Plane Potential Flows01:23

Plane Potential Flows

192
Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform...
192
Eulerian and Lagrangian Flow Descriptions01:22

Eulerian and Lagrangian Flow Descriptions

921
Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
The Eulerian method focuses on fixed points in space where fluid properties, such as velocity, pressure, and temperature, are observed as the fluid moves between these...
921
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

86
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.
86
Rapidly Varying Flow01:24

Rapidly Varying Flow

40
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...
40

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相关实验视频

Updated: May 15, 2025

A Microfluidic Model of Biomimetically Breathing Pulmonary Acinar Airways
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A Microfluidic Model of Biomimetically Breathing Pulmonary Acinar Airways

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一个动态的非线性流量算法来建模患者流量.

Arsineh Boodaghian Asl1, Jayanth Raghothama2, Adam S Darwich2

  • 1Department of Biomedical Engineering and Health Systems, KTH Royal Institute of Technology, Huddinge, 14157, Sweden. arsineh@kth.se.

Scientific reports
|April 8, 2025
PubMed
概括

这项研究引入了修改的流量算法来分析医院的患者流量. 该算法通过考虑床位容量和人员可用性等因素来识别瓶,改善医院绩效洞察力.

科学领域:

  • 医疗保健系统工程 系统工程
  • 运营研究 运营研究
  • 网络流分析 网络流分析

背景情况:

  • 医院是复杂的系统,具有动态和非线性患者流.
  • 现有的流程算法主要集中在运输和电信上,在医疗保健应用中存在局限性.
  • 医院瓶源于病房行为 (容量,员工,服务时间) 和护理途径的分布.

研究的目的:

  • 开发一种修改流程算法,用于模拟医院的动态患者流动.
  • 在医院网络中识别和量化瓶.
  • 提供对医院绩效的整体看法,并分析病房动态行为.

主要方法:

  • 提出了一个修改后的网络流算法.
  • 该算法对患者到达率进行代,考虑顶点的容量,服务器,服务时间变化和边缘分布概率.
  • 创建一个动态残余图来测量瓶的持续性和严重性.

主要成果:

  • 该算法有效地测量了医院网络内的患者流动动态.
  • 它确定了瓶,它们的根本原因,以及医院病房的非线性行为.
  • 动态残余图提供了关于瓶严重程度和随时间的持续性的见解.

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Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics
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Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics

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

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Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics
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Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics

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

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结论:

  • 修改的流量算法为分析医院患者流量的新方法提供了新的方法.
  • 它可以全面了解医院的运营绩效和瓶动态.
  • 这种方法有助于优化医院资源配置,改善患者护理途径.