Equation Icon  1 ( ) ∂t^n1 + --∇ ⋅ n1∇ šœƒ + nc ∇ ^šœƒ1 = 0, (245 ) m ^ -1 ^ ā„2-- ∂tšœƒ1 + m ∇ šœƒ ⋅ ∇ šœƒ1 + κ (a)n1 − 2m D2 ^n1 = 0. (246 )