Droplet sedimentation

There are two essential consequences of this relation. Because larger droplets sediment or rise much faster (a 5-p.m drop rises 625 times faster than a 0.2-p.m droplet), the process is equal to shearing, leading to enhanced flocculation. The ratio between flocculation due to shear and to diffusion of droplets is proportional to the cube of the radius. Secondly, flocculation to droplet aggregates means an enhanced sedimentation rate. Sis drops ia an octahedral arrangement gives approximately four times the sedimentation rate. 

Studies of interdiffusion have been extended to polymer systems. Structured flow formation was detected for these systems in zonal centrifugation experiments 66,67). If a polymer solution is layered on top of a more dense solution containing a low molecular weight solute, then interdiffusion of the salt into the polymer solution eventually gives rise to density inversion, and droplets of polymer solution will sediment. This effect has often been described as droplet sedimentation or the turnover effect 68). 

Processes needed in-/below-cloud scavenging and droplet sedimentation... 

The sediment consists of finely divided solids that may be drilling mud or sand or scale picked up during the transport of the oil or may consist of chlorides derived from evaporation of brine droplets in the oil. The solids may be dispersed in the oil or carried in water droplets. Sediment in petroleum can lead to serious plugging of equipment, corrosion due to chloride decomposition, and a lowering of residual fuel quality. 

These and many other astonishing experimental results are not fully understood yet. In principle, the mechanisms of droplet sedimentation are well known and can be reliably modelled. The only problem is the prediction of drop size. The knowhow on coalescence is, however, rather poor and totally insufficient. Henschke (1995) developed a method for phase splitting modelling that is a combination of simple... 

An example of the above occurs when human carbon monoxide hemoglobin is eleetrofoeused in a pH gradient 6-8. It exhibits droplet sedimentation in the middle zones if a total protein amount of 1.5 mg/cm of cross section has been added at the start. In the LKB 110 ml column this corresponds to about 8 mg. The same amount of protein electro-focused in a pH-gradient of 7-8 does not show droplet sedimentation. 

Droplet sedimentation is another technique for estimating the contact angles of small particles by determining... 

Table 14.5. Comparison of the surface tensions of fixed erythrocytes obtained by the droplet sedimentation and solidification front techniques, using water/ice (from ref. (70))...

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