Aspect ratio is the ratio of effective length to height of the collector surface. The aspect ratio should be high enough to allow the rapped particles to settle in the hopper before they are carried out of the ESP by the gas flow. The aspect ratio is usually greater than 1.0 for high-efficiency ESPs. Aspect ratios of 1.3 to 1.5 are common, and they are occasionally as high 2.0.
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