Collision between droplets influence

The results on the influence of the impinging distance are shown in Fig. 7.17 as a plot of 77s versus the dimensionless impinging distance, S/d(). In the range tested the sulfur-removal efficiency decreases continuously as S/d() reduces. The most likely reason is that at smaller impinging distance the concentration of droplets in the impingement zone increases, giving enhanced collision between droplets and an increased tendency of the droplets to coalescence, thus reducing the interface area. On... 

Table 5.2 Examples of Values of Rate Constants Associated with the Exchange of Material upon Collisions Between Droplets and Influence of Important Parameters...

The DPET s electrodes are in the form of concentric cylindrical plates suspended from the top of the vessel and are connected to a high-voltage transformer such that adjacent plates are given opposite charges. As the oil passes through the electrodes, water droplets are influenced by the field to create a sinusoidal migration between plates of opposite charge. This motion serves two purposes to restrict the upward flow of the water in relation to the oil and to enhance the rate of collision of water droplets, which are distorted to form dipoles under the electric field, and thereby increase the rate of coalescence. Clean oil leaves from the top of the vessel, while water is drained out from the bottom. Instrumentation available on this unit permits pressure and temperature measurement of both the feed and vessel conditions and the treated oil and outlet water flow rates. 

Stream and generated a vortex flow which leads to a faster droplet freezing as well as a droplet deflection to prevent droplet collisions. The temperature was reduced at the nozzle position from room temperature to —75 °C for gas flows ranging between 17 and 34 L/min (Fig. 10.12). Different nozzle positions inside the vortex were evaluated experimentally. Additionally, the influence of the airflow of the cold gas... 

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