Question: Express the 2-dimensional continuity equation in cylindrical coordinates.
Options
A : frac{partial( ho v_r)}{partial r}+frac{1}{r}frac{partial( ho v_ heta)}{partial heta}+frac{ ho v_r}{r}=0
B : frac{partial( ho v_r)}{partial r}+frac{1}{r}frac{partial( ho v_ heta)}{partial heta}+ ho frac{v_r}{r}+frac{partial ho}{partial t}=0
C : frac{partial( ho v_r)}{partial r}+frac{1}{r}frac{partial( ho v_ heta)}{partial heta}+frac{partial ho}{partial t}=0
D : frac{partial( ho v_r)}{partial r}+frac{1}{r}frac{partial( ho v_ heta)}{partial heta}+ ho frac{v_r}{r}+frac{partial ho}{partial t}=0
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