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相关概念视频

Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

216
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
216
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

172
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.
172
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

4.3K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
4.3K
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

186
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
186
Couette Flow01:22

Couette Flow

244
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
244
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

67
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...
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相关实验视频

Updated: Jun 23, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

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稳定的扩散梯度在由流体壁所界定的微流体导管中.

Federico Nebuloni1,2, Cyril Deroy1,2, Peter R Cook2

  • 1Department of Engineering Science, Osney Thermo-Fluids Institute, University of Oxford, Oxford, OX2 0ES UK.

Microsystems & nanoengineering
|June 24, 2024
PubMed
概括

这项研究引入了流体壁微流体学,用于在生物医学研究中创建精确的度梯度. 开发的模型准确地预测了这些梯度,有助于研究细胞对生物活性分子的反应.

科学领域:

  • 生物医学工程 生物医学工程
  • 微流体学 微流体学
  • 细胞生物学 细胞生物学

背景情况:

  • 准确的体外度梯度对于研究生物反应至关重要,例如对抗感染和凝血.
  • 传统的固体塑料微流体装置限制了直接的蜂接入.
  • 流体壁微流体学提供了一种新的方法,使用不混合的流体在彼得里盘上制造电路.

研究的目的:

  • 开发和验证一种分析模型,用于预测流体壁微流体导管中的扩散和度梯度.
  • 为了使细胞研究能够精确控制生物活性分子度.
  • 为了促进生物医学研究的微流体电路的快速设计.

主要方法:

  • 在具有圆形截面的流体壁管道中扩散的分析模型的开发.
  • 模型的实验验证,使用层状流之间的光素扩散.
  • 专注于适应流动压力的流体壁,而不是刚性固体壁.

主要成果:

  • 分析模型被实验验证为福里埃数<0.1.1.
  • 该模型准确地预测了流体壁管道内的度梯度.
  • 证明了预测细胞周围局部生物活性分子度的能力.
关键词:
工程 工程师 工程师 工程师物理 物理学 物理

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相关实验视频

Last Updated: Jun 23, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow
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结论:

  • 经过验证的模型允许先验预测流体壁微流体系统中的度梯度.
  • 这项技术增强了对受控化学环境的细胞反应的研究.
  • 为生物科学家提供了一种强大的工具,用于设计微流体分析和解释细胞行为.