Download Advances in LES of Complex Flows (Fluid Mechanics and Its by Rainer Friedrich, Wolfgang Rodi PDF

By Rainer Friedrich, Wolfgang Rodi

Includes the complaints of the EUROMECH Colloquium, held in Munich, Germany. Articles specialize in new advancements within the box of large-eddy simulation of advanced flows concerning the subjects of modeling and research of subgrid scales, numerical matters in LES, and combustion and magnetohydrodynamics.

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Extra info for Advances in LES of Complex Flows (Fluid Mechanics and Its Applications) (v. 65)

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This figure illustrates the influence of the gas and liquid flow rates on the aerosol characteristics. It is widely known that the increase in the gas flow rate is beneficial to generate fine droplets. This is a direct effect of the increase in the total amount of kinetic energy available to produce liquid surface. 23a towards the left (fine droplets) as the gas flow rate goes up. The increase in this variable leads to a rise in the percentage of droplets with diameters below 10 mm, which will be completely evaporated before the plasma observation zone [335].

It is found that for nebulizers having the same design, the aerosols produced are actually quite different in size. D50 changes by about 3 mm. It is also interesting to notice that this is not a regular trend with regard to the effect of the gas exit cross-sectional area. More interesting is the fact that for several nebulizers having similar values of this dimension, the aerosol produced is different. Therefore, there should be another nebulizer dimension able to explain this result. The next nebulizer dimension that can be considered is the sample capillary inner diameter [382].

Furthermore, there are other processes that can account for the generation of droplets by the appearance of maxima in this kind of curves such as the sample capillary oscillation at characteristic frequencies [507]. The position of the maxima on the drop size distributions in band depends on the nebulizer dimensions and the gas and liquid flow rates. Another point that adds complexity to the interpretation of the data corresponding to aerosol characterization is related with processes taking place from the aerosol production point to the measurement zone [231].

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