1.

Express the 2-dimensional continuity equation in cylindrical coordinates.

A. ( frac{ partial( rho v_r)}{ partial r}+ frac{1}{r} frac{ partial( rho v_ theta)}{ partial theta}+ frac{ rho v_r}{r}=0 )
B. ( frac{ partial( rho v_r)}{ partial r}+ frac{1}{r} frac{ partial( rho v_ theta)}{ partial theta}+ rho frac{v_r}{r}+ frac{ partial rho}{ partial t}=0 )
C. ( frac{ partial( rho v_r)}{ partial r}+ frac{1}{r} frac{ partial( rho v_ theta)}{ partial theta}+ frac{ partial rho}{ partial t}=0 )
D. ( frac{ partial( rho v_r)}{ partial r}+ frac{1}{r} frac{ partial( rho v_ theta)}{ partial theta}+ rho frac{v_r}{r}+ frac{ partial rho}{ partial t}=0 )
Answer» C. ( frac{ partial( rho v_r)}{ partial r}+ frac{1}{r} frac{ partial( rho v_ theta)}{ partial theta}+ frac{ partial rho}{ partial t}=0 )


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