where ai is the ith fraction of the total bag area and Si is the drag through that area (Stephan, Walsh, and Herrick 1960). Substituting the values ai and Si for the cleaned and uncleaned portions in Equation 5.16(44) calculates the drag for the entire filter. When the local filtration velocity through each bag area (which depends on local drag) is used, the additional dust collected on each area over time can be determined. This collection in turn changes the local drag. This procedure allows an iterative prediction of pressure drop versus time.

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