7. Fluid Phase Separation Processes in Submarine Hydrothermal Systems

2007 ◽  
pp. 213-240 ◽  
Author(s):  
Dionysis I. Foustoukos ◽  
William E. Seyfried
Keyword(s):  
Phase Separation ◽  
Fluid Phase ◽  
Hydrothermal Systems ◽  
Separation Processes ◽  
Submarine Hydrothermal Systems

scholarly journals A new model of sulfur isotopes behavior in the modern submarine hydrothermal systems

2019 ◽  
Vol 486 (5) ◽  
pp. 593-597
Author(s):  
E. O. Dubinina ◽  
N. S. Bortnikov
Keyword(s):  
Sulfur Isotope ◽  
Isotope Composition ◽  
World Ocean ◽  
Total Content ◽  
Fluid Phase ◽  
Hydrothermal Systems ◽  
Published Data ◽  
Rock Interaction ◽  
Submarine Hydrothermal Systems ◽  
Reduced Sulfur

A model of sulfur isotope distribution at modern submarine hydrothermal systems is proposed. It is assumed that thermogenic sulfate reduction at the water-rock interaction zone takes place under closed system conditions respectively to fluid phase. As a result, the Rayleigh exhaustion with respect to the 32S isotope arises in the fluid. The model also takes into account the simultaneous extraction of reduced sulfur from surrounding rocks. The calculated fraction of extracted sulfur at the total content of reduced sulfur in the fluid varies from 0.15 to 0.06 for submarine systems associated with tholeiitic basalts and peridotites, respectively. The model application to published data can explain the well-known contradictions that have arisen during the study of the sulfur isotope composition of sulfides from world Ocean deep-sea edifices.

Boron and halide systematics in submarine hydrothermal systems: Effects of phase separation and sedimentary contributions

1994 ◽  
Vol 123 (1-3) ◽  
pp. 227-238 ◽  
Author(s):  
C.-F. You ◽  
D.A. Butterfield ◽  
A.J. Spivack ◽  
J.M. Gieskes ◽  
T. Gamo ◽  
...  
Keyword(s):  
Phase Separation ◽  
Hydrothermal Systems ◽  
Submarine Hydrothermal Systems

scholarly journals Gelation Impairs Phase Separation and Small Molecule Migration in Polymer Mixtures

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1576
Author(s):  
Biswaroop Mukherjee ◽  
Buddhapriya Chakrabarti
Keyword(s):  
Phase Separation ◽  
Rational Design ◽  
Surface Segregation ◽  
Multiscale Methods ◽  
Coarse Grained ◽  
Polymer Gel ◽  
Polymer Mixtures ◽  
Separation Processes ◽  
Surface Migration ◽  
Wide Range

Surface segregation of the low molecular weight component of a polymeric mixture is a ubiquitous phenomenon that leads to degradation of industrial formulations. We report a simultaneous phase separation and surface migration phenomena in oligomer–polymer ( O P ) and oligomer–gel ( O G ) systems following a temperature quench that induces demixing of components. We compute equilibrium and time varying migrant (oligomer) density profiles and wetting layer thickness in these systems using coarse grained molecular dynamics (CGMD) and mesoscale hydrodynamics (MH) simulations. Such multiscale methods quantitatively describe the phenomena over a wide range of length and time scales. We show that surface migration in gel–oligomer systems is significantly reduced on account of network elasticity. Furthermore, the phase separation processes are significantly slowed in gels leading to the modification of the well known Lifshitz–Slyozov–Wagner (LSW) law ℓ ( τ ) ∼ τ 1 / 3 . Our work allows for rational design of polymer/gel–oligomer mixtures with predictable surface segregation characteristics that can be compared against experiments.

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