The continuity equation is based on which of the following applications?

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SSC JE Mechanical 14 Nov 2022 Shift 2 Official Paper
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  1. Conservation of Mass 
  2. Conservation of Energy 
  3. Conservation of Momentum 
  4. Conservation of Energy and Momentum

Answer (Detailed Solution Below)

Option 1 : Conservation of Mass 
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Explanation:

Continuity equation:

\(\begin{array}{l} \frac{{\partial \left( {\rho u} \right)}}{{\partial x}} + \frac{{\partial \left( {\rho v} \right)}}{{\partial y}} + \frac{{\partial \left( {\rho w} \right)}}{{\partial z}} + \frac{{\partial \rho }}{{\partial t}} = 0\\ \frac{{\partial \rho }}{{\partial t}} + \bar V.\left( {\rho \vec V} \right) = 0 \end{array}\)

Continuity equation:

The continuity equation is the equation of conservation of mass in a fluid flow. 

According to the law of conservation of mass:

SSC JE MEchanical 2 8

Rate of flow in section 1 - 1 = Rate of flow at section 2 - 2

\({\rho _1} \times {A_1} \times {V_1} = {\rho _2} \times {A_2} \times {V_2}\)

For Incompressible fluids

\( {A_1} \times {V_1} = {A_2} \times {V_2}\)

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