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Related Concept Videos

Characteristics of Fluids01:20

Characteristics of Fluids

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When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
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Fluid Movement Between Compartments01:18

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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Characteristics of Fluids01:31

Characteristics of Fluids

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Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
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Newtonian Fluid: Problem Solving01:18

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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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Capillarity in Fluid01:19

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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Euler's Equations of Motion01:28

Euler's Equations of Motion

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In fluid mechanics, shear stresses arise from viscosity, which represents a fluid's internal resistance to deformation. For low-viscosity fluids, like water, these stresses are minimal, simplifying flow analysis by allowing the fluid to be treated as inviscid, or frictionless. In an inviscid fluid, shear stresses are absent, leaving only normal stresses, which act perpendicularly to fluid elements. Notably, pressure — defined as the negative of the normal stress — remains uniform...
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BioMEMS and Cellular Biology: Perspectives and Applications
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Cellular fluid mechanics.

Roger D Kamm1

  • 1Department of Mechanical Engineering and Division of Bioengineering and Environmental Health, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. rdkamm@mit.edu

Annual Review of Fluid Mechanics
|May 14, 2003
PubMed
Summary
This summary is machine-generated.

Fluid dynamics significantly impacts cell behavior in microcirculation. This review highlights the glycocalyx

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Area of Science:

  • Interdisciplinary science bridging fluid dynamics and cell biology.

Background:

  • Cellular responses to fluid dynamics are crucial in physiology and disease.
  • Microcirculatory flow involves complex cell-cell and cell-glycocalyx interactions.

Purpose of the Study:

  • To review recent studies on circulating cells and fluid dynamics.
  • To emphasize the role of the glycocalyx in red blood cell motion and leukocyte deformation.
  • To discuss fluid dynamics near noncirculating cells and its biological effects.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of fluid dynamic shear stress effects on cell biology.
  • Examination of diffusion within lipid bilayers.

Main Results:

  • The glycocalyx influences red blood cell movement in capillaries.
  • Fluid shear stress affects leukocyte deformation during microcirculation.
  • Fluid dynamics impacts noncirculating cells and cellular processes like diffusion.

Conclusions:

  • Fluid dynamics plays a critical role in cellular functions within the microcirculation.
  • Understanding these interactions is key for both normal physiology and disease states.
  • Further research into cell-glycocalyx interactions and shear stress responses is warranted.