电磁水力动力学 (EMHD) 流的杰弗里流体通过一个粗的圆形微通道与表面电荷依赖的滑动
Dongsheng Li1, Jiayin Dong1, Haibin Li1
1College of Science, Inner Mongolia University of Technology, Hohhot, P. R. China.
Electrophoresis
|May 29, 2024
概括
这项研究分析了大致微通道中的电磁水力动力 (EMHD) 流. 墙壁粗度会影响速度和流量,表面电荷效应会显著改变结果,特别是在更高的雷诺兹数下.
科学领域:
- 流体动力学 流体动力学
- 电磁水力学 (EMHD) 是指电磁水力学.
- 微流体学 微流体学
背景情况:
- 微通道在各种应用中至关重要,需要深入了解它们内的流体行为.
- 电磁水力学 (EMHD) 描述了受电磁力影响的流体运动,与先进的流体控制有关.
- 杰弗里流体模拟非牛顿流体的行为,提供比牛顿流体更复杂的质学视角.
研究的目的:
- 为了研究Jeffrey流体在一个粗的圆形微通道内的电磁水力动力学 (EMHD) 流动.
- 分析表面电荷对滑动和墙壁粗度对流体速度和体积流速的影响.
- 探索雷诺兹数,粗度参数和表面电荷对流动特征的影响之间的相互作用.
主要方法:
- 使用扰动方法来得出速度和体积流速的分析解决方案.
- 使用3D和2D图形表示来可视化关键参数的影响.
- 专注于墙壁粗度,波数,表面电荷密度,放松时间,减速时间和哈特曼数的影响.
主要成果:
- 墙壁粗性在低雷诺兹数下降速度,但在高雷诺兹数下增加速度.
- 粗度中波数的奇偶倍数导致比偶倍数更稳定的速度配置文件.
- 表面充电效应显著改变体积流速,在墙壁粗时引起显著下降 (高达32%).
结论:
- 墙壁粗度和表面电荷是影响微通道EMHD流量的关键因素.
- 粗度和表面电荷之间的相互作用可以导致流速发生重大变化.
- 结果为优化微通道应用中的EMHD流量模型提供了必要的数据.
相关概念视频
Bernoulli's Equation for Flow Along a Streamline
957
Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
957
Couette Flow
245
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...
245
Uniform Depth Channel Flow
68
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...
68
Steady, Laminar Flow in Circular Tubes
189
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...
189
Fluid Pressure over Curved Plate of Constant Width
1.6K
When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
1.6K
Bernoulli's Equation for Flow Normal to a Streamline
848
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.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
848


