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Statements

Subject Item
dbr:Departure_function
rdf:type
yago:MathematicalStatement106732169 yago:Communication100033020 yago:WikicatEquations yago:Abstraction100002137 yago:Equation106669864 yago:Message106598915 yago:Statement106722453
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Departure function Grandeur résiduelle
rdfs:comment
In thermodynamics, a departure function is defined for any thermodynamic property as the difference between the property as computed for an ideal gas and the property of the species as it exists in the real world, for a specified temperature T and pressure P. Common departure functions include those for enthalpy, entropy, and internal energy. Departure functions are computed by integrating a function which depends on an equation of state and its derivative. En thermodynamique, une grandeur résiduelle exprime l'écart entre une grandeur thermodynamique extensive d'un mélange réel (gaz, liquide ou solide) et la même grandeur thermodynamique extensive d'un mélange de gaz parfaits aux mêmes pression, température et composition.
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dbc:Thermodynamics dbc:Fluid_mechanics dbc:Equations
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6211280
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dbr:Reduced_temperature dbr:Compressibility_factor dbc:Equations dbr:Gibbs_free_energy dbr:Thermodynamics dbc:Fluid_mechanics dbr:Reduced_pressure dbr:Critical_pressure dbr:Equation_of_state dbr:Entropy dbr:Enthalpy dbr:Residual_property_(physics) dbr:Critical_temperature dbr:Internal_energy dbr:Ideal_gas dbr:Acentric_factor dbc:Thermodynamics
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En thermodynamique, une grandeur résiduelle exprime l'écart entre une grandeur thermodynamique extensive d'un mélange réel (gaz, liquide ou solide) et la même grandeur thermodynamique extensive d'un mélange de gaz parfaits aux mêmes pression, température et composition. In thermodynamics, a departure function is defined for any thermodynamic property as the difference between the property as computed for an ideal gas and the property of the species as it exists in the real world, for a specified temperature T and pressure P. Common departure functions include those for enthalpy, entropy, and internal energy. Departure functions are used to calculate real fluid extensive properties (i.e. properties which are computed as a difference between two states). A departure function gives the difference between the real state, at a finite volume or non-zero pressure and temperature, and the ideal state, usually at zero pressure or infinite volume and temperature. For example, to evaluate enthalpy change between two points h(v1,T1) and h(v2,T2) we first compute the enthalpy departure function between volume v1 and infinite volume at T = T1, then add to that the ideal gas enthalpy change due to the temperature change from T1 to T2, then subtract the departure function value between v2 and infinite volume. Departure functions are computed by integrating a function which depends on an equation of state and its derivative.
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