薄壁の粘着弾性チューブの脈動性流量
Oleksander Krul1, Prosenjit Bagchi1
1Mechanical and Aerospace Engineering Department, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.
Journal of fluid mechanics
|August 26, 2025
まとめ
この研究では 柔軟な粘着弾性チューブでの 流体の流れが研究されています 壁の粘度と振動周波数が 流動に大きく影響し 独特の弾性波及と圧縮効果を生み出します
科学分野:
- 流体力学
- 生物医学工学
- 材料科学
背景:
- 生物学的および工学的なシステムはしばしば 伸縮性,粘着性のある容器に低慣性,脈動的な流れを備えています
- 既存の研究はしばしば大きな変形を無視し,代わりに最小の変形容器の慣性流に焦点を当てています.
研究 の 目的:
- 低レイノルズ数で大きな変形を経験する粘着弾性管の動態を調査するために,振動的な流れ.
- 壁の粘度と振動周波数のチューブ変形,流量,相変化,ヒステレスへの影響を分析する.
主な方法:
- 完全に結合された流体/構造の相互作用の計算モデルを使用した.
- 固体の粘度と振動周波数の変動が流動物理とチューブの動作に及ぼす影響を調べた.
主要な成果:
- 膨張時に弾性フローの急上昇と,デフレーション時に圧縮を観測した.
- 振動周波数が増加すると,流れが増加し,膨張が減少し,固体の粘度が増加すると,両方が減少した.
- 変形と流量は,固体の粘度と振動周波数の中間範囲内で最も敏感です.
結論:
- 管のダイナミクスは複雑なフェーズシフトとヒステリシスを示し,フローレットは潜在的に圧力を引くか遅らせる.
- ヒステレス方向は,流れ率の相変化によって予測可能であり,時計回りの方向,逆方向,または混合可能である.
- 固体の高粘性は,純粋に弾性管とは異なり,全管運動を誘導する.
関連する概念動画
01:23Steady, Laminar Flow in Circular Tubes
381
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...
381
01:07Laminar and Turbulent Flow
9.1K
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...
9.1K
01:15Thin-Walled Hollow Shafts
238
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
238
01:10Poiseuille's Law and Reynolds Number
7.0K
Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
7.0K
01:22Couette Flow
439
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...
439
01:27Steady Flow of a Fluid Stream
354
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...
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
354