Equation Icon  ( ) ( ) − ∂t ∂ρρ0(∂tϕ1 + v0 ⋅ ∇ ϕ1 ) + ∇ ⋅ ρ0∇ ϕ1 − ∂ρ-ρ0v0(∂tϕ1 + v0 ⋅ ∇ ϕ1) = 0. (24 ) ∂p ∂p