Quality of Separation

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Measurement of droplet sizes (Dp) in industrial separators is impractical. We cannot verify the theoretical model; instead, we must rely on qualitative judgments. In general, when separators whose performance has been judged “good” are analyzed with the above terminal velocity correlations, it is found that the process conditions would theoretically allow 100-micron drops to settle. Conditions which would allow only 300-micron and larger drops to settle correspond to “poor” separation.

Rather than using droplet-size calculations directly for a new design, use them, whenever possible, for comparing a new design with existing separators whose performances have been qualitatively judged. In the absence of data, design for settling of 100-micron drops.

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