“laminar flow”的概念、定义、翻译、参考文献-科学参考

laminar flow

Physics

Streamline flow of a fluid in which the fluid moves in layers without fluctuations or turbulence so that successive particles passing the same point have the same velocity. It occurs at low Reynolds numbers, i.e. low velocities, high viscosities, low densities or small dimensions. The flow of lubricating oil in bearings is normally laminar because of the thinness of the lubricant layer.

Chemical Engineering

The streamline flow of a fluid in which a fluid flows without fluctuations or turbulence. The velocities of fluid molecules are in the direction of flow with only minor (p. 214) movement across the streamlines caused by molecular diffusion. The existence was first demonstrated in 1883 by Osborne Reynolds, who injected a trace of coloured fluid into a flow of water in a glass pipe. At low flow rates the coloured fluid was observed to remain as discrete filaments along the tube axis, indicating flow in parallel streams. At increased flow rates, oscillations were observed in the filaments, which eventually broke up and dispersed across the tube. There appeared to be a critical point for a particular tube and fluid above which the oscillations occurred. By varying the various parameters Reynolds found that his results could be correlated into terms of a dimensionless number called the Reynolds number, Re, as:
$Re = \frac{ρ v d}{μ}$

where ρ is the density of the fluid, v is the velocity of the fluid, d is the diameter of the pipe, and μ is the viscosity of the fluid. The critical value of Re for the break-up of laminar flow in pipes of circular cross section is about 2,000.

Geology and Earth Sciences

Type of flow (normally in water) characterized by the movement of fluid particles parallel to each other, with no transverse movement or mixing. Velocity increases steadily away from the bed. Laminar flow in channels is found only at low velocities and adjacent to smooth surfaces. It is almost ubiquitous in soil moisture and groundwater (except in karstic aquifers).

Geography

A non-turbulent flow where the movement of each part of the fluid (gaseous, liquid, or plastic) has the same velocity, with no mixing between adjacent ‘layers’ of the fluid. It may be seen at low velocities in a smooth, straight river channel (see Smith et al. (2007) PPG 31, 4).

单词	laminar flow
释义	laminar flow Physics Streamline flow of a fluid in which the fluid moves in layers without fluctuations or turbulence so that successive particles passing the same point have the same velocity. It occurs at low Reynolds numbers, i.e. low velocities, high viscosities, low densities or small dimensions. The flow of lubricating oil in bearings is normally laminar because of the thinness of the lubricant layer. Chemical Engineering The streamline flow of a fluid in which a fluid flows without fluctuations or turbulence. The velocities of fluid molecules are in the direction of flow with only minor (p. 214) movement across the streamlines caused by molecular diffusion. The existence was first demonstrated in 1883 by Osborne Reynolds, who injected a trace of coloured fluid into a flow of water in a glass pipe. At low flow rates the coloured fluid was observed to remain as discrete filaments along the tube axis, indicating flow in parallel streams. At increased flow rates, oscillations were observed in the filaments, which eventually broke up and dispersed across the tube. There appeared to be a critical point for a particular tube and fluid above which the oscillations occurred. By varying the various parameters Reynolds found that his results could be correlated into terms of a dimensionless number called the Reynolds number, Re, as: $Re = \frac{ρ v d}{μ}$ where ρ is the density of the fluid, v is the velocity of the fluid, d is the diameter of the pipe, and μ is the viscosity of the fluid. The critical value of Re for the break-up of laminar flow in pipes of circular cross section is about 2,000. Geology and Earth Sciences Type of flow (normally in water) characterized by the movement of fluid particles parallel to each other, with no transverse movement or mixing. Velocity increases steadily away from the bed. Laminar flow in channels is found only at low velocities and adjacent to smooth surfaces. It is almost ubiquitous in soil moisture and groundwater (except in karstic aquifers). Geography A non-turbulent flow where the movement of each part of the fluid (gaseous, liquid, or plastic) has the same velocity, with no mixing between adjacent ‘layers’ of the fluid. It may be seen at low velocities in a smooth, straight river channel (see Smith et al. (2007) PPG 31, 4).
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