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What is difference between Saffman lift force and shear gradient lift force?

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In inertial micro-fluidics field, there are many types lift force.
Among them, there are Saffman lift force and shear gradient lift force.
I think that Saffman lift force and shear gradient lift force is generated by fluid velocity profile.
So I think the two force is same. But some of paper distinct about them.
I can't understand about it, Because cause of occurrence is similar as well as phenomenon is similar.
Who can teach me what is difference between Saffman lift force and shear gradient force?
Please teach me!!

0 Replies Last Post Feb 17, 2016, 12:06 a.m. EST
COMSOL Moderator

Hello Lee Kyunghun

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