nucleation rates of ethanol and methanol using saft and pc-saft eoss
DESCRIPTION
Nucleation Rates Of Ethanol And Methanol Using SAFT And PC-SAFT EOSs. Fawaz Hrahsheh Advisor ::Dr. Abdalla Obeidat Co-advisor ::Dr. H. Al-Ghanim Department of Physics JUST. Outline. ● Metastability and nucleation ● Work of formation and versions - PowerPoint PPT PresentationTRANSCRIPT
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Nucleation Rates Of Ethanol And Methanol Using SAFT
And PC-SAFT EOSs
Fawaz HrahshehAdvisor ::Dr. Abdalla ObeidatCo-advisor ::Dr. H. Al-Ghanim
Department of PhysicsJUST
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Outline
● Metastability and nucleation● Work of formation and versions● Temperature and saturation dependence
of classical theories● Conclusions
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• The binodal curve (solid dome)separates one-phase and two-phase states
• TC = critical temperature
• The spinodal curve (dashed dome) separates metastable and unstable states
• One true horizontal isotherm is shown
Metastable and unstable regions for the van der Waals
fluid
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• Solid black lines represent points of equilibrium two-phase coexistence
• c is the critical point• b is the triple point• When, say, gas is forced to
cross lines ab or bc it is no longer the thermodynamically stable phase.
• The transition to the new stable phase is not instantaneous.
SPINODALLINE
Schematic pressure – temperature phase diagram for
a pure substance
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Kinds & Definition Of Nucleation
-Homogeneous Nucleation-Hetrogeneous Nucleation
-The process of formation of the critical size cluster (droplet) which has the ability to
grow spontaneously.
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The work of formation-The work of Formation is the work
which is needed To form the critical size droplet
-The work of formation consists from two terms: the bulk (volumetric) term
and the surface term.
APPVWvl
)(
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The work of formation composite by two terms.
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Three versions of classical theory
●Gibbs’s exact formula: ● version 1: use bulk surface tension for
● Version 2: liquid droplet is incompressible,– and ● Version 3: the vapor is an ideal gas– and
–S =Pv /Pve (Supersaturation Ratio)
W p ( / ) / ( )1 6 3 3 2 p p pre f vap
p l
kT Sln
2
2 )/()3/16( lw
)ln/()3/16(3 skTw l
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Pressure vs density isotherm
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Nucleation rate is given by
/KTWCL eJJ
*
0
where
2
0
2
KTP
mJ
l
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SAFT & PC-SAFT Theories
● SAFT…Statistical Associating Fluid Theory
● PC-SAFT….Perturbed-Chain Statistical
Associating Fluid Theory
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SAFT and PC-SAFT EOS
RTA
RTA
RTA
RTA
RTA
RTA assocdischainhsideal
●A is the reduced free helmholtz energy●The association term is just for polar
fluids
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Binodal points of ethanol And methanolusing SAFT and PC-SAFT
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Gibbs’s formula improves classical nucleation rates for METHANOL
based on SAFT EOS.
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Gibbs’s formula improves classical nucleation rates for ETHANOL
based on PC-SAFT EOS.
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Conclusions
• P-form improves the T and S dependence for methanol and ethanol at high temperature..• Quantitatively, P-form improves the results
by than S-form for methanol and ethanol.
42 1010
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Thank You