Question

The pressure coefficient is the ratio of pressure forces to:
1. Gravity forces
2.  Viscous forces
3. Inertia forces
4. Buoyant forces

Answer 1

Correct Answer - Option 3 : Inertia forces

Explanation

• Reynolds Number: This is the dimensionless parameter which is defined as the ratio of Inertia force to viscous force.
• \(Re = \frac{{\rho Vx}}{\mu } = \frac{{Vx}}{\nu }\)
• Friction factor: Friction factor is the dimensionless quantity which depends upon the Reynolds number for different types of flows.
• \(f = \frac{{16}}{{Re}}\) for laminar flow
• Pressure coefficient: It is the ratio of pressure forces to inertial forces. It is also a dimensionless number.
• \({c_p} = \frac{{{\rm{\Delta }}P}}{{\frac{{\rho {V^2}}}{2}}}\)
• Kinematic viscosity (ν): It is defined as the ratio of dynamic viscosity to density of fluid. It has unit of m2/s.