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相关概念视频

Couette Flow01:22

Couette Flow

258
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...
258
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

179
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.
179
Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

963
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:
963
Basic Equation for Pressure Field01:13

Basic Equation for Pressure Field

216
The basic equation for a pressure field in fluid mechanics captures the balance of forces within any segment of fluid, providing a foundational understanding of how pressure changes within fluids under various forces. Generally, two main types of forces act on any part of a fluid: surface forces and body forces. Surface forces arise from pressure differences across points within the fluid, which result in net forces that can vary depending on the local pressure gradient. Body forces, on the...
216
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

63
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
63
Phase Diagram01:19

Phase Diagram

5.9K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
5.9K

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相关实验视频

Updated: Jun 28, 2025

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
00:09

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole

Published on: August 26, 2019

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基于色度梯度的相场方程,用于多相流的相场方程.

Reza Haghani1, Hamidreza Erfani1, James E McClure2

  • 1PoreLab, Department of Geoscience and Petroleum, Norwegian University of Science and Technology (NTNU), 7031 Trondheim, Norway.

Physical review. E
|April 18, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的相场模型,以准确模拟密度对比流体,克服色调梯度方法的局限性. 这种新的方法确保了流体不变性,并增强了复杂流体流动的模拟.

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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

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相关实验视频

Last Updated: Jun 28, 2025

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
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Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole

Published on: August 26, 2019

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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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科学领域:

  • 计算流体动力学的流体动力学.
  • 多相流量建模多相流量建模
  • 阶段场方法 阶段场方法

背景情况:

  • 颜色梯度 (CG) 方法在处理具有显著密度差异的流体方面存在局限性,特别是缺乏流体不变性.
  • 在各种科学和工程领域,准确模拟高密度和粘度对比的不可压缩,不可混合的两流体流量至关重要.

研究的目的:

  • 通过提出一个新的相场接口捕获模型来解决密度对比流体的CG方法的缺陷.
  • 开发一个强大的计算框架来模拟具有实质性属性变化的二元流体流.

主要方法:

  • 对CG方法的非维度化,以获得新的相场配方.
  • 实现一个格子博尔茨曼法溶解器与二元流体流动的水力动力学溶解器相结合.
  • 使用分离分布函数用于相场公式和纳维埃-斯托克斯方程.

主要成果:

  • 拟议的相场模型成功地捕捉了由流速转向的接口,避免了单个流体的声音速度的问题.
  • 开发并验证了一种能够处理高密度和粘度对比度的二元流体流量包.
  • 数值测试表明与分析和数值解决方案的良好一致,证实了模型的准确性和稳定性.

结论:

  • 新的相场模型提供了一种流体不变和稳定的方法来模拟密度对比流体,其性能优于传统的CG方法.
  • 开发的基于格子博尔兹曼的解决器为复杂的多相流模拟提供了可靠的工具.