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the liquid flow distance

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Old   August 18, 2021, 22:45
Default the liquid flow distance
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I am new to UDF, I am trying to apply the following equation to calculate the contact time in multiphase flow:

t = l/usurf

where l is the liquid flow distance. At each moment, the coordinates of the liquid in each cell could be obtained so the flow distance could be calculated.
I am trying to understand how to calculate l (liquid flow distance) by UDF based on mentioned explanation.

Thank you in advance for your help.
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liquid film, mass transfer vof udf, multiphase flow

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