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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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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.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
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Modeling and Similitude01:12

Modeling and Similitude

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Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
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Fluid Pressure over Curved Plate of Constant Width01:12

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When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
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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...
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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
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使用计算流体动力学的软技术的建模.

Ippei Watanabe1, Hirokazu Mukuno2

  • 1Medical Affairs, Seikagaku Corporation, Chiyoda-ku, Tokyo, Japan.

Clinical ophthalmology (Auckland, N.Z.)
|May 5, 2025
PubMed
概括

在软技术中模拟了眼科粘度外科设备 (OVD). 分散型OVD形成了一层保护层,而凝聚型OVD有效地填充了眼睛,展示了对外科预测至关重要的独特行为.

科学领域:

  • 眼科医生 眼科 眼科
  • 生物医学工程 生物医学工程
  • 流体动力学 流体动力学

背景情况:

  • 在眼科手术中,软技术对于保护眼组织至关重要.
  • 了解眼科粘性手术装置 (OVD) 的流体动力学对于优化手术结果至关重要.

研究的目的:

  • 通过流体动力学模拟,阐明眼科粘度外科设备 (OVDs) 在软技术期间的行为.
  • 在模拟的眼睛环境中分析分散性和凝聚性OVD之间的相互作用.

主要方法:

  • 使用Fluent2023R2和ICEM CFD模拟的分散性OVD (3%的酸[HA]和4%的氏素硫酸) 和凝聚性OVD (1%的HA) 的流体动力学.
  • 在模拟内眼注射每0.1毫升OVD时评估的质量分数,静态压力,速度,剪切率和表面粘度.

主要成果:

  • 散射OVD注射导致眼内压升幅最小,在角膜内皮上形成了一层保护层.
  • 与分散式OVD相比,凝聚式OVD注射增加了向切口的速度和溢出,在管尖端附近的剪切率更高,表面粘度更低.
  • 在内皮表面的分散性OVD在凝聚性OVD注射过程中表现出低切割率 (<10−110s−1) 和明显粘度 (<30100 Pa·s).

结论:

关键词:
白内障手术是什么?白内障手术是什么?顺德里二硫酸盐 顺德里二硫酸盐氨酸是什么? 氨酸是什么?眼科粘度外科设备 眼科粘度外科设备

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  • 流体动力学模拟有效地证明了软技术的机制,使用不同性质的OVD.
  • 该研究为了解和预测眼科手术中的OVD行为提供了关键参数.