相关实验视频
Updated: May 11, 2025
08:01
The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
8.4K
在泡泡流中溶解物体运输的双组件格子博尔茨曼模型
1University of Limerick, Bernal Institute and Department of Chemical Sciences, Faculty of Science and Engineering, Castletroy, Limerick V94 T9PX, Ireland.
Physical review. E
|April 18, 2025
概括
一个新的自由能量格子博尔兹曼模型准确地模拟了非理想溶剂和理想溶解物混合物. 这种方法捕捉了相位平衡,表面张力和溶液运输,为研究流体动力学提供了强大的工具.
科学领域:
- 计算流体动力学的流体动力学.
- 热力学是一种热力学.
- 阶段过渡 阶段过渡
背景情况:
- 用非理想溶剂和理想溶液对二元混合物的准确建模对于理解复杂的流体行为至关重要.
- 现有的模型往往难以实现热力学平衡,并且在这种系统中处理高密度比.
研究的目的:
- 为二进制系统开发一个自由能量格子博尔兹曼模型,其中包括一个非理想溶剂和一个气态理想溶液.
- 为了准确地捕捉热力学平衡,相位行为,表面张力和溶液运输现象.
主要方法:
- 导出自由能量函数来定义两个格子博尔兹曼方程的驱动力,每个组件一个.
- 实施一个平衡的格子博尔兹曼法,以防止分离错误,并确保热力学平衡.
- 包括合时刻的混合物速度,来自溶剂密度梯度的表面张力,以及通过移动性术语的扩散.
主要成果:
- 该模型成功地实现了两个组件的正确热力学平衡,即使在高密度比.
- 液体和蒸汽相之间的溶液分布遵循亨利定律,与理论预测一致.
- 用静态气泡和平面接口证明模型参数对相位组成,表面张力和溶解物输送速率的影响的表征.
结论:
- 开发的自由能量格子博尔兹曼模型为模拟非理想溶剂-理想溶解物混合物提供了一个强大的框架.
- 该模型准确地预测了关键的物理现象,包括相位平衡,表面张力和质量转移.
- 提供了溶解物扩散系数的方程,为进一步的研究和应用提供了宝贵的见解.
相关概念视频
01:27Distribution of Molecular Speeds
3.6K
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...
3.6K
02:24Ideal Solutions
18.7K
According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
18.7K
01:20Maxwell-Boltzmann Distribution: Problem Solving
1.3K
Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
1.3K
01:09Solubility Equilibria: Overview
545
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
Solubility is important in biological and environmental processes. A notable...
545
01:17Steady, Laminar Flow Between Parallel Plates
79
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.
79
01:34The Fluid Mosaic Model
141.7K
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
141.7K