Dust collection flow pattern

Filtration systems have been a mainstay of fine and other exhaust gas cleaning for many years. The traditional baghouse (also called a fabric filter) uses an array of filter elements supported on cages and suspended from a horizontal plate inside the filter housing. This plate divides the dirty gas from the clean side of the filter, and is perforated with a regular pattern of holes to each of which a filter element is fixed. The gas flow may be from inside out (with dust collected inside the bag), or from outside in (with solids collecting on the outside surface) - the two systems having very different methods of solids removal. 

The ice fields adjacent to the Allan Hills, where a large number of meteorite specimens have been collected, also contain tephra layers. The outcrop patterns of these layers indicate that the ice was extensively deformed as it flowed over and around the subglacial foothills of the Transantarctic Mountains. A small deposit of black spherules embedded in the ice near the Allan Hills was attributed to the passage through the atmosphere of a stony meteorite. This deposit reminds us that the East Antarctic ice sheet contains extraterrestrial particles and specimens of meteorites in addition to terrigenous dust and volcanic ash. 

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