The measured pressure drop across a filter is used with Equation 5.16(37) to determine the effective fiber diameter df for use in the filtration efficiency theory, previously described (Lee and Ramamurthi 1993). Predicting the pres-

sure drop for real filters is not straightforward. Comparing the measured pressure drop and calculated pressure drop based on an ideal flow field indicates how uniformly the media structure elements, such as fibers or pores, are arranged.

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