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相关概念视频

Distribution of Molecular Speeds01:27

Distribution of Molecular Speeds

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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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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.
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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

40.0K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
40.0K
Couette Flow01:22

Couette Flow

110
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...
110
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

89
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...
89
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

25
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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相关实验视频

Updated: May 8, 2025

Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
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保守的基于相场的格子博尔兹曼方程,用于气-液-固体流量.

Lin Zheng1, Song Zheng2, Qinglan Zhai3

  • 1Nanjing University of Science and Technology, MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing 210094, People's Republic of China.

Physical review. E
|February 20, 2025
PubMed
概括

一个新的保守的相场格子博尔茨曼方程 (LBE) 模型具有显著密度差异的气-液-固体流. 这种方法准确地模拟复杂的相互作用,包括可湿性和流体-固体力,通过各种测试案例验证.

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科学领域:

  • 多相流动力学 多相流动力学
  • 计算流体动力学的流体动力学.
  • 阶段场建模 阶段场建模

背景情况:

  • 模拟高密度对比的气-液-固体流动带来了重大的计算挑战.
  • 对接口和流体-固体相互作用的准确建模对于理解多相现象至关重要.

研究的目的:

  • 开发一种基于相场的保守格子博尔兹曼方程 (LBE),用于模拟具有高密度对比度的气-液-固体流.
  • 将固体湿度纳入相场模型并准确捕捉流体-固体相互作用.

主要方法:

  • 使用保守的艾伦-卡恩方程 (CACE) 来捕获气液接口,并修改了可湿度的源项.
  • 一个格子博尔兹曼方程 (LBE) 解决了修改后的CACE (MCACE),而另一个LBE则解决了两相流.
  • 用光滑型材方法 (SPM) 计算流体-固体相互作用力.

主要成果:

  • 开发的MCACE-LBE-SPM成功模拟了具有高密度对比度的气-液-固体流.
  • 滴滴传播,气浮力,毛细血管相互作用和通道流动的模拟表明了该模型的能力.
  • 数字预测与理论和以前的数值结果有很好的一致性.

结论:

  • 拟议的MCACE-LBE-SPM是模拟复杂的气体-液体-固体流的强大而准确的方法.
  • 该模型有效地处理大密度比,并结合了固体湿透性和流体-固体相互作用.