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Consider the velocities $u, v$, and $w$ in $x$-, $y$-, and $z$-directions, respectively. The vorticity expression in the $y-z$ plane is

  1. $\frac{\partial v}{\partial x}-\frac{\partial u}{\partial y}$
  2. $\frac{\partial v}{\partial y}-\frac{\partial w}{\partial z}$
  3. $\frac{\partial w}{\partial y}-\frac{\partial v}{\partial z}$
  4. $\frac{\partial u}{\partial z}-\frac{\partial w}{\partial x}$

     

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