Particle Velocity
Particle Velocity - Related Videos
07:53
Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
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Cited by 12 •
2013
Micro-particle image velocimetry (μPIV) is used to visualize paired images of micro particles seeded in blood flows which are cross-correlated to give an accurate velocity profile. Shear rate, maximum velocity, velocity profile shape, and flow rate, each of which has clinical applications, can be derived from these measurements.
10:28
Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Cited by 15 •
2014
This paper demonstrates the experimental procedure to measure terminal settling velocities of spherical particles in surfactant-based shear thinning viscoelastic fluids. Fluids over a wide range of rheological properties are prepared and settling velocities are measured for a range of particle sizes in unbounded fluids and fluids between parallel walls.
08:42
Determination of Zeta Potential via Nanoparticle Translocation Velocities through a Tunable Nanopore: Using DNA-modified Particles as an Example
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Cited by 7 •
2016
Here we use a polyurethane tunable nanopore integrated into a resistive pulse sensing technique to characterize nanoparticles surface chemistry via the measurement of particle translocation velocities, which can be used to determine the zeta potential of individual nanoparticles.
03:07
Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy
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2020
The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws. Collectively, the molecules in a sample of gas have average kinetic energy and average speed; but individually, they move at different speeds. Molecules frequently undergo elastic collisions in which the momentum is conserved. Since the colliding molecules are deflected off at different...
16:31
Echo Particle Image Velocimetry
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Cited by 10 •
2012
An echo particle image velocimetry (EPIV) system capable of acquiring two-dimensional fields of velocity in optically opaque fluids or through optically opaque geometries is described, and validation measurements in pipe flow are reported.
FAQs
Average and instantaneous values answer different motion questions. Average particle velocity uses the displacement accumulated over a finite elapsed time, so it summarizes motion across an interval. Instantaneous velocity comes from the time derivative of position and describes the motion at a particular moment. Comparing them helps determine whether an interval average hides changes occurring within the motion.
Acceleration provides the link between particle velocity and changing motion. A particle can accelerate when its speed changes, when its direction changes, or when both occur, because velocity includes directional information. Examining velocity together with acceleration therefore gives a more complete description of mechanical motion than reporting a speed value alone, especially when analyzing forces or momentum.
In wave analysis, the velocity of medium particles and the wave’s propagation speed represent different motions. Particle velocity describes the oscillatory movement of the material through which the disturbance travels, whereas propagation speed describes the advance of the wave pattern. Keeping these quantities separate prevents incorrect interpretations of wave behavior and clarifies how particle motion relates to energy transport.
Calculate an average value by measuring the particle’s displacement over a selected time interval and dividing by the elapsed time. For a moment-by-moment result, represent position as a function of time and take its time derivative. The choice depends on whether the investigation needs an interval summary or the instantaneous behavior of the motion.
Particle velocity is useful across mechanical systems, fluids, and waves, but its interpretation depends on the setting. In mechanical analysis, it helps describe motion alongside forces and momentum. In fluid and wave studies, it characterizes motion within the medium. This broad applicability makes velocity a common quantity for comparing motion across different physical systems.
Velocity data can support both direct characterization and model-based analysis. Researchers can use it to examine vibration, relate changing motion to acceleration, and study how motion contributes to energy transport. In practice, combining velocity information with position, time, and the relevant physical context helps distinguish overall motion from local or oscillatory behavior.