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viscosity problem ( in non newtonian electrosmosis micro mixer )

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hi every body
i want to simulate a electrosmosis micro mixer with non Newtonian fluid. i add Dc Ac module and non newtonian flow
for this simulation i must be define electrosmosis velocity in some boundary .but when i define : u=- [(eps_0)(eps_r)(zeta-potential)/etha)]*E for that boundris and solve , comsol say this error :failed to evaluate etha variable !!
i defined etha in subdomain expression ,too
can you help me please!

0 Replies Last Post 22 juil. 2014, 03:38 UTC−4
COMSOL Moderator

Hello Mahsa Mostafavi

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