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相关概念视频

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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Accelerating Fluids01:17

Accelerating Fluids

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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
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Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
186
Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
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Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

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Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
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Laminar and Turbulent Flow01:07

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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Modeling and Simulations of Olfactory Drug Delivery with Passive and Active Controls of Nasally Inhaled Pharmaceutical Aerosols
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计算流体动力学模拟来个性化鼻灌.

Thomas Radulesco1,2, Dario Ebode1,2, Ralph Haddad2

  • 1IUSTI Laboratory, Centre National de la Recherche Scientifique (CNRS), Aix Marseille University, 13001 Marseille, France.

Journal of personalized medicine
|July 25, 2025
PubMed
概括

头部位置显著影响鼻水灌的有效性. 向右倾斜头部可以改善盐溶液输送到上鼻,而直立的位置提供较少的鼻覆盖.

关键词:
计算流体动力学的流体动力学.鼻子和鼻上鼻.鼻科 鼻科是指鼻科的专家.

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科学领域:

  • 生物医学工程 生物医学工程
  • 计算流体动力学的流体动力学.
  • 鼻科 鼻科是指鼻科的专家.

背景情况:

  • 有效的鼻灌对于管理鼻状况至关重要.
  • 技术影响药物输送和患者舒适度.
  • 了解鼻腔中的流体动力学是关键.

研究的目的:

  • 评估不同头部位置对盐水分布的影响.
  • 分析鼻腔和大鼻腔中的流体动力学.
  • 使用计算流体动力学 (CFD) 来优化鼻水灌技术.

主要方法:

  • 在健康成年人的基于CT的模型上进行的CFD模拟.
  • 4毫升盐水溶液在3秒内注入鼻腔.
  • 分析鼻腔区域和上鼻的液体分布和粘膜覆盖.

主要成果:

  • 垂直位置:主要是下/中鼻区域,鼻穿透最小.
  • 右倾的位置:改善了上鼻覆盖和下鼻灌.
  • 左倾的位置:加强中部鼻腔覆盖,轻微改善鼻.

结论:

  • 头部位置是鼻水灌结果的重要因素.
  • 特定的头部倾斜可以增强对尾鼻的向传递.
  • 这些发现可以为鼻灌方案的临床实践提供信息.