Movement of particles

Brownian movement The rapid and random movement of particles of a colloidal sol, observed brightly lit against a dark ground. First observed with a pollen suspension. The Brownian movement is due to the impact on the dispersed particles of the molecules of the dispersion medium. As the particles increase in size, the probability of unequal bombardment from different sides decreases, and eventually collisions from all sides cancel out and the Brownian movement becomes imperceptible at a particle size of about 3-4/z. From the characteristics of the movement, Perrin calculated Avogadro s number L. 

Diffusional interception or Brownian motion, ie, the movement of particles resulting from molecular collisions, increases the probability of particles impacting the filter surface. Diffusional interception also plays a minor role in Hquid filtration. The nature of Hquid flow is to reduce lateral movement of particles away from the fluid flow lines. 

Compaction, Compression, and Expression. Compaction is a newer term for compression and is used to describe the movement of particles relative to one another within a device until the matrix of particles gains enough strength to resist further consoHdation (16). Compaction occurs in a plate and frame filter both while the chamber is filling and at the end of the cycle when the chamber is nearly full and the pressure rises steeply. Compactibihty (or compressibiUty) describes the reduction in volume of the particle matrix. Compaction also takes place in the bed of a thickener as the sohds continuously deposit on the top of the bed and a thickened slurry is withdrawn from the bottom. 

FIG. 19-26 Movement of particles in a jig. a) Displacement of the bed as a function of time, (h) Starting position of particles, (c) After dilation. (d) After differential initial acceleration, (e) After hindered settling, (f ) After consolidation trickling. 

Which of the following graphs best represents the movement of particles in a liquid ... 

Suzuki, Y Nishio, I, Quasielastic-Light-Scattering Study of the Movement of Particles in Gels Topological Structure of Pores in Gels, Physical Review B 45, 4614, 1992. 

In nonwoven geotextiles, the fibers are much thinner but far more numerous. The various types are needle-punched, resin-bond, and melt-bond. All contain a labyrinth of randomly oriented fibers that cross one another so that there is no direct line of flow. The fabric must have enough open space to allow liquid to pass through, while simultaneously retaining any upstream movement of particles. The needle-punched nonwoven type is very commonly used as a filter material. 

As mentioned earlier, in principle, one can model the dynamics of a simple classical fluid by means of MD simulations. This technique, although straightforward, is relatively time-consuming, and therefore not suitable for observation of large-scale macroscopic phenomena in the fluid. However, one often does not need such a detailed description of the microdynamics as provided by MD. In such cases, it would be more efficient to strip the MD model down to its barest essentials, where the only requirement is that the model behaves like a fluid macroscopically, but is still atomistic in character—i.e., the mechanism underlying the fluid motion is the movement of particles. From the derivation of... 

I walked closer to this apparition and bent toward the flame. The fire appeared still, absolutely frozen. My mind shot back to the moment above the river when it too had seemed stilled forever. The flame was uncanny. As deeply as I cared to look into it I could see no movement of particles or gas. I seemed to have my usual freedom of movement, but the world around me was coming to a crystalline and eerie halt. 

The movement of particles in a gel due to electrodes (positive and negative) applied to opposite ends of the gel... 

Electrophoresis involves movement of particles in suspension under the influence of an electric field the direction of movement depends on the charge of the particles... 

Kinetic energy (KE) Kinetic energy is the energy of motion. Thermal energy is a kind of kinetic energy, cirising from the movement of particles within systems. 

Static electricity can also be generated by the movement of particles, such as dusts or snow driven by high winds, or by steam driven by high pressure... 

The subject of the movement of particles in a stream of gas arises in connection with pulverized coal, catalytic fluid cracking, etc. Khudyakov and Chukhanov 5P) derive equations and present an experiment using sand particles ranging between 70 and 845 microns. The particles are introduced into a stream of air flowing vertically down through glass tubes of varying diameter. 

Electrophoresis. The movement of particles in an electrical field. A commonly used technique for analysis of mixtures of molecules in solution according to their electrophoretic mobilities. 

Consequently, the direction of movement of particles with different densities is independent in our system. 

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