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相关概念视频

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

275
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
275
Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
691
Rapidly Varying Flow01:24

Rapidly Varying Flow

51
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
51
Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

259
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
259
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

141
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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Typical Model Studies01:30

Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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相关实验视频

Updated: Jun 7, 2025

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

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一个一致的扩散接口模型,用于快速蒸发的两相流量问题.

Magdalena Schreter-Fleischhacker1, Peter Munch2,3, Nils Much1

  • 1Institute for Computational Mechanics, Technical University of Munich, Boltzmannstrasse 15, 85748 Garching, Germany.

Advanced modeling and simulation in engineering sciences
|November 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扩散接口模型,用于在两相流中快速蒸发. 它准确地预测了蒸发质量和压力跳跃,改进了融-蒸汽相互作用的模拟.

关键词:
扩散接口模型蒸发是蒸发的过程.有限元素方法 有限元素方法.融化蒸汽相互作用具有相变的双相流.

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A High Performance Impedance-based Platform for Evaporation Rate Detection
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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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相关实验视频

Last Updated: Jun 7, 2025

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
08:02

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A High Performance Impedance-based Platform for Evaporation Rate Detection
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A High Performance Impedance-based Platform for Evaporation Rate Detection

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科学领域:

  • 多相流体物理 多相流体物理
  • 计算流体动力学的流体动力学.
  • 热量和质量转移是热量和质量转移.

背景情况:

  • 在双相流中模拟快速蒸发,由于大密度不连续性和动态接口变化,因此存在挑战.
  • 现有的模型在相位转换期间难以准确预测速度,压力跳跃和接口拓.

研究的目的:

  • 开发准确和数学一致的扩散界面模型,用于快速蒸发的两相流.
  • 为了改善蒸发动态,质量转移和液体-蒸汽界面的压力变化的预测.
  • 在与标准粘性流构成关系相结合时,解决扩散接口模型中的工件.

主要方法:

  • 在无矩阵的自适应有限元素框架内集成一个不可压缩的纳维埃-斯托克斯溶解器与保守的水平设定配方.
  • 为扩散接口区域开发外推速度定义,提高曲面接口的准确性.
  • 实现对方密度插值以保持质量,并引入粘性构成模型的校正项.

主要成果:

  • 与局部评估相比,外推速度定义在预测蒸发质量和接口动态方面表现出更高的准确性.
  • 一致的反复密度插值对于准确预测蒸发引起的压力跳跃至关重要.
  • 一个建议的校正术语有效地减轻了由分散接口模型与斯托克斯类型的构成关系相结合而产生的压力工件.

结论:

  • 开发的扩散接口模型提供了准确和一致的配方,用于在两相流中快速蒸发.
  • 该模型增强了复杂现象的模拟,例如在热多相系统中的融化蒸汽相互作用.
  • 这项工作为基于激光的金属粉末床融合等应用提供了改进的预测能力.