Bubble Size

Some types of spargers allow the change of bubble size distribution at nearly constant overall air rate. Both break-up and coalescence of bubbles occur after formation by the sparging devices which results in an equilibrium size distribution above a certain distance from the spargers. The average and deviation of this distribution depend on the surface tension at the air-water interface and turbulence in the cell. Generally, smaller bubbles provide higher collection intensity and carrying capacity, but loaded microbubbles may sink or be entrained in the downward slurry. Also, maximum gas rate (at column flooding point or transition to a churn-turbulent regime) is reduced with decreasing bubble size, meaning that there is a specific bubble size that gives the maximum upward rising surface area Sux. The point of column Sooding can be estimated (in the assumption of cross-section Sow uniformity and narrow bubble size distribution) from the drift flux model. In many cases a combination of smaller bubbles that provide the separation and coarser transport bubbles that coalesce with the smaller bubbles results in optimal Sotation rates.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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