# flowisentropic

Isentropic flow ratios

## Syntax

## Description

### Default Input Mode

`[`

returns an
array that contains an isentropic flow Mach number `mach`

,`T`

,`P`

,`rho`

,`area`

]
= flowisentropic(`gamma`

,`flow`

)`mach`

, temperature
ratio `T`

, pressure ratio `P`

, density ratio
`rho`

, and area ratio `area`

. This function
calculates these arrays given a set of specific heat ratios (`gamma`

)
for the Mach input mode.

## Examples

## Input Arguments

## Output Arguments

## Limitations

This function assumes that variables vary only in one dimension. It also assumes that the main mechanism for the change of flow variables is the change of cross-sectional area of the flow stream tubes.

If the temperature experiences large fluctuations, the perfect gas assumption might be invalid. If the stagnation temperature is above 1500 K, do not assume constant specific heats. In this case, the medium ceases to be a calorically perfect gas. Consider it a thermally perfect gas. For thermally perfect gas correction factors, see [2]. If the temperature is so high that molecules dissociate and ionize (static temperature 5000 K for air), you cannot assume a perfect gas.

## More About

## Version History

**Introduced in R2010a**

## See Also

`flowfanno`

| `flownormalshock`

| `flowprandtlmeyer`

| `flowrayleigh`