Calculating area of Nozzle

Harikrishnan Murali

Nozzle

  • A nozzle is often a pipe or tube of varying cross sectional area, and it can be used to direct or modify the flow of a fluid (liquid or gas).

  • Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them.

  • In nozzle velocity of fluid increases on the expense of its pressure energy.

Geometry

  • The nozzle in question here is a supersonic diverging nozzle.

  • It converts a low speed fluid flow into a flow faster than the speed of sound.

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Necessity of the App

  • The nozzle geometry results in the formation a region where there is an abrupt conversion of fluid velocity.

  • This is called a shockwave.

  • This region is of utmost importance to fluid dynamicists.

  • The area of the nozzle's cross section is the first step towards calculating the location of the shock.

How it works

  • It uses the formula

\[A(x)=1.398 + 0.347\tanh(0.8x-4)\]

where \(A(x)\) is the area at a particular distance \(x\).

##If x=1, then
x=1
A=1.398 +0.347*tanh(0.8*x-4)
print(A)
## [1] 1.052151