# Flow Through Nozzle and Orifice Problem 4 - Compressible Fluid Flow - Fluid Mechanics 1 | Summary and Q&A

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June 3, 2022
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Flow Through Nozzle and Orifice Problem 4 - Compressible Fluid Flow - Fluid Mechanics 1

## TL;DR

The content discusses the variation of mass flow rate and velocity with pressure ratio in compressible fluid flow through nozzles and orifices, as well as the relation between maximum velocity and sonic velocity.

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### Q: What is the formula for mass flow rate in compressible fluid flow through nozzles and orifices?

The mass flow rate formula is m dot = a2 * sqrt(2 * gamma / (gamma - 1) * (p1 / a * rho1) * (n^2 / (gamma - n^(gamma + 1) / gamma)).

### Q: How does the mass flow rate per unit area vary with pressure ratio?

The mass flow rate per unit area decreases as the pressure ratio increases from 0 to 0.528. After reaching the maximum value at n = 0.528, it gradually decreases as n increases further.

### Q: What is the relation between velocity and sonic velocity in compressible fluid flow?

The velocity of fluid at the outlet (v2) is equal to the square root of the product of 2 * gamma / (gamma + 1) * (p1 / sqrt(rho1)). It can also be simplified as the square root of (gamma * p2 / rho2), which is the sonic velocity.

### Q: How does the velocity of fluid at the outlet vary with the sonic velocity?

The velocity of fluid at the outlet is directly proportional to the sonic velocity, with a formula of v2 = sqrt(gamma * p2 / rho2). As the sonic velocity increases, the fluid velocity at the outlet also increases.

## Summary & Key Takeaways

• The content explores the formula for mass flow rate, considering variables such as pressure ratio, density, and gamma (specific heat ratio).

• The mass flow rate per unit area is calculated using different values of n and plotted on a graph, showing a maximum point at n = 0.528.

• The relation between velocity and sonic velocity is derived, showing that the velocity equals the square root of the product of the pressure ratio and gamma divided by the density.