Hydraulic calculation of Aspen packed towers: Fractional approach to minimum and minimum fractional capacity
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This post was last edited by The second monk on 2019-12-25 at 13:12. I would like to ask everyone: in the hydraulic calculations of Aspen packed columns, what is the relationship between the Fractional approach to minimum and Minimum fractional capacity?
You can check the help documents; I usually use the first method, which is the ratio of void fraction to vapor velocity. There is a specified range in engineering practice, apparently between 0.5 and 0.9 – the lower the value, the more conservative it is
Thank you for your reply! I’ve also read the help document, but I didn’t understand it clearly. If the Fractional approach to maximum is chosen, within the range of 0.5 to 0.8, the calculated Maximum fractional capacity can sometimes be close to or greater than 1. What is the reason for this? Is there a reasonable range for the Maximum fractional capacity?
See which formula is better, and then for the four curves of the tower