Fuel evaporation in a tank - Pressure calculation

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SUMMARY

The discussion centers on calculating the equilibrium pressure in a fuel tank with both liquid and gas phases as the temperature changes. The user inquires about the correct method to determine this pressure, given the assumption that the gas phase is air. A participant suggests that instead of performing calculations, one should reference a vapor pressure table specific to the fuel's properties for accurate results.

PREREQUISITES
  • Understanding of thermodynamics, specifically phase equilibrium.
  • Knowledge of vapor pressure and its significance in fuel properties.
  • Familiarity with fuel types and their respective vapor pressure tables.
  • Basic principles of gas laws and temperature-pressure relationships.
NEXT STEPS
  • Research the vapor pressure tables for various fuel types.
  • Learn about phase equilibrium calculations in thermodynamics.
  • Explore the impact of temperature on vapor pressure in fuels.
  • Study the relationship between temperature and pressure using the Ideal Gas Law.
USEFUL FOR

Engineers, chemists, and anyone involved in fuel management or thermodynamic analysis will benefit from this discussion.

Kapopadu
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Hello everybody,

I have the following problem:

I have a fuel tank, with a liquid phase (the fuel) and gas phase at To and P0, where T is temperature and P pressure. I assume that the gas phase at the instant t=t0 is air.
(Is this assumption correct?)

The temperature of the liquid phase varies over the time with a certain profile from T0 to Tend.
The fuel due to the increasing of the temperature evaporates with a certain law (most probably unknown).

How can I calculate the equilibrium pressure between the two phases according to the temperature changes over the time?

Thanks in advance,
K
 
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Welcome to PF!

I would think you wouldn't calculate it but rather just look up the vapor pressure in a table of the fuel's properties.
 

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