Determine the pde for helicity density (h(t, mathbf{x}) equiv mathbf{v} cdot !) for the flow of an

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Determine the pde for helicity density \(h(t, \mathbf{x}) \equiv \mathbf{v} \cdot !\) for the flow of an incompressible Newtonian fluid. Define helicity \(\mathcal{H}\) by (15.30) and establish the equation for it.

Eq (15.30)

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