Phase separation during mixing of partially miscible fluids under near-critical and supercritical conditions, and the phenomenon of “uphill diffusion”

2018 ◽  
Vol 135 ◽  
pp. 105-119 ◽  
Author(s):  
Ping He ◽  
Ahmed F. Ghoniem
Keyword(s):  
Phase Separation ◽  
Miscible Fluids ◽  
Uphill Diffusion ◽  
Supercritical Conditions ◽  
Partially Miscible

scholarly journals Study of New Absorption Refrigeration Cycle Operating with Partially Miscible Fluids Pairs

2012 ◽  
Vol 18 ◽  
pp. 1013-1022
Author(s):  
Larkeche Ouassila ◽  
Meniai Abedeslam Hassan ◽  
Zermane Ahmed ◽  
Khatib Yacine ◽  
Cachot Thierry
Keyword(s):  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Miscible Fluids ◽  
Partially Miscible

scholarly journals Intrinsic Structure of the Interface of Partially Miscible Fluids: An Application to Ionic Liquids

2015 ◽  
Vol 119 (51) ◽  
pp. 28448-28461 ◽  
Author(s):  
György Hantal ◽  
Marcello Sega ◽  
Sofia Kantorovich ◽  
Christian Schröder ◽  
Miguel Jorge
Keyword(s):  
Ionic Liquids ◽  
Miscible Fluids ◽  
Intrinsic Structure ◽  
Partially Miscible

scholarly journals Viscous fingering with partially miscible fluids

2017 ◽  
Vol 2 (10) ◽  
Author(s):  
Xiaojing Fu ◽  
Luis Cueto-Felgueroso ◽  
Ruben Juanes
Keyword(s):  
Viscous Fingering ◽  
Miscible Fluids ◽  
Partially Miscible

scholarly journals Growing Interface with Phase Separation and Spontaneous Convection during Hydrodynamically Stable Displacement

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6089
Author(s):  
Takahiko Ban ◽  
Ryohei Tanaka ◽  
Ryuta X. Suzuki ◽  
Yuichiro Nagatsu
Keyword(s):  
Phase Separation ◽  
Viscous Fluid ◽  
Oil Recovery ◽  
Co2 Sequestration ◽  
Growth Exponent ◽  
Fluid Displacement ◽  
Roughness Exponent ◽  
Partially Miscible ◽  
Thermodynamic Conditions ◽  
Lost Foam

The displacement of one fluid by another is an important process, not only in industrial and environmental fields, such as chromatography, enhanced oil recovery, and CO2 sequestration, but also material processing, such as Lost Foam Casting. Even during hydrodynamically stable fluid displacement where a more viscous fluid displaces a less viscous fluid in porous media or in Hele-Shaw cells, the growing interface fluctuates slightly. This fluctuation is attributed to thermodynamic conditions, which can be categorized as the following systems: fully miscible, partially miscible, and immiscible. The dynamics of these three systems differ significantly. Here, we analyze interfacial fluctuations under the three systems using Family–Vicsek scaling and calculate the scaling indexes. We discovered that the roughness exponent, , and growth exponent, , of the partially miscible case are larger than those of the immiscible and fully miscible cases due to the effects of the Korteweg convection as induced during phase separation. Moreover, it is confirmed that fluctuations in all systems with steady values of and are represented as a single curve, which implies that accurate predictions for the growing interface with fluctuations in Hele-Shaw flows can be accomplished at any scale and time, regardless of the miscibility conditions.

scholarly journals Microfluidics of binary liquid mixtures with temperature-dependent miscibility

2020 ◽  
Vol 5 (1) ◽  
pp. 358-365 ◽  
Author(s):  
Maximiliano J. Fornerod ◽  
Esther Amstad ◽  
Stefan Guldin
Keyword(s):  
Phase Separation ◽  
Liquid Mixtures ◽  
Flow Patterns ◽  
Binary Liquid Mixtures ◽  
Temperature Dependent ◽  
Microfluidic Mixing ◽  
Binary Liquid ◽  
Partially Miscible

We report on the use of temperature to actively control the microfluidic mixing, phase separation and flow patterns of partially miscible binary liquid mixtures.

scholarly journals Microfluidics of Temperature-Responsive Partially Miscible Binary Liquid Mixtures

2018 ◽  
Author(s):  
Maximiliano J. Fornerod ◽  
Esther Amstad ◽  
Stefan Guldin
Keyword(s):  
Phase Separation ◽  
Flow Regimes ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
Solution Temperature ◽  
Microfluidic Channels ◽  
Critical Solution Temperature ◽  
Binary Liquid ◽  
Temperature Responsive ◽  
Partially Miscible

Two-phase liquid-liquid microfluidics relies on the intricate control over the fluid properties of liquid mixtures. Herein, we report on the use of partially miscible binary liquid mixtures that lend their microfluidic properties from a highly temperature-sensitive mixing and phase separation behaviour. For a blend composed of the thermotropic liquid crystal 4-Cyano-4'-pentylbiphenyl (5CB) and methanol, mixing at temperatures above the upper critical solution temperature (UCST) leads to a uniform single phase while partial mixing can be achieved at temperatures below the UCST. Thermally-driven phase separation inside the microfluidic channels results in the formation of very regular phase arrangements, namely in droplets, plug, slug and annular flow. We map different flow regimes and relate findings to the role of viscous, interfacial and inertial forces. As the interfacial tension of the mixture and the dynamic viscosity of the separated phases are inversely proportional to temperature, different flow regimes can be achieved at constant channel architecture and flow rate. A consistent behaviour is observed for a binary liquid mixture with lower critical solution temperature, namely 2,6-lutidine and water. This temperature-responsive approach to microfluidics is an interesting candidate for multi-stage processes, selective extraction and sensing applications.

scholarly journals Extended Larché–Cahn framework for reactive Cahn–Hilliard multicomponent systems

2021 ◽  
Author(s):  
Santiago P. Clavijo ◽  
Luis Espath ◽  
Victor M. Calo
Keyword(s):  
Phase Separation ◽  
Chemical Reactions ◽  
Diffusion Processes ◽  
Continuum Theory ◽  
Reaction Diffusion ◽  
Study Phase ◽  
Uphill Diffusion ◽  
Solid Diffusion ◽  
Phase Fields ◽  
Component Content

AbstractAt high temperature and pressure, solid diffusion and chemical reactions between rock minerals lead to phase transformations. Chemical transport during uphill diffusion causes phase separation, that is, spinodal decomposition. Thus, to describe the coarsening kinetics of the exsolution microstructure, we derive a thermodynamically consistent continuum theory for the multicomponent Cahn–Hilliard equations while accounting for multiple chemical reactions and neglecting deformations. Our approach considers multiple balances of microforces augmented by multiple component content balance equations within an extended Larché–Cahn framework. As for the Larché–Cahn framework, we incorporate into the theory the Larché–Cahn derivatives with respect to the phase fields and their gradients. We also explain the implications of the resulting constrained gradients of the phase fields in the form of the gradient energy coefficients. Moreover, we derive a configurational balance that includes all the associated configurational fields in agreement with the Larché–Cahn framework. We study phase separation in a three-component system whose microstructural evolution depends upon the reaction–diffusion interactions and to analyze the underlying configurational fields. This simulation portrays the interleaving between the reaction and diffusion processes and how the configurational tractions drive the motion of interfaces.

Sign in / Sign up

Export Citation Format

Share Document