The general equation of continuity for three-dimensional flow an incompressible fluid for steady flow is:
1
\(\frac{{\partial u}}{{\partial x}} + \frac{{\partial v}}{{\partial y}} + \frac{{\partial w}}{{\partial z}} = 0\)
2
\(\frac{{\partial u}}{{\partial x}} + \frac{{\partial v}}{{\partial y}} + \frac{{\partial w}}{{\partial z}} = 1\)
3
\(\frac{{\partial u}}{{\partial x}} = \frac{{\partial v}}{{\partial y}} = \frac{{\partial w}}{{\partial z}} = 0\)
4
None of these