Calculating Heat of Compression in a Fluid?

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SUMMARY

The discussion focuses on calculating the heat of compression in fluids, specifically in the context of an injector transitioning from 0 psi to 4000 psi. It is established that while air can be analyzed for heat of compression, liquids are typically treated as incompressible, meaning pressure changes do not significantly affect their temperature. Additionally, the instant expansion of fuel from the injector does not return it to the temperature at 0 psi, as the cooling effect is not solely dependent on pressure changes.

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  • Understanding of thermodynamics principles related to fluids
  • Knowledge of fluid mechanics, particularly incompressible flow
  • Familiarity with pressure-temperature relationships in gases and liquids
  • Basic concepts of heat transfer and expansion in fluids
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  • Study the principles of incompressible fluid dynamics
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I have air figured out, but what about in a fluid? Say an injector that goes from 0psi to 4000psi. How would I calculate that? Also, when the fuel shoots out of the injector, does the instant expansion cause it to cool back down to the temp it was at 0psi?
 
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If by fluid, you mean liquid, then typically, they are assumed to be incompressible, and as such, the pressure alone does not heat them up.
 

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