Systems with a Miscibility Gap in the Liquid State

Predel, B.; Ratke, Lorenz; Fredriksson, Hasse

doi:10.1007/978-3-642-46613-7_15

Cited by 21 publications

(7 citation statements)

References 29 publications

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“…This explains the interest of the scientiÿc community on miscibility gap [1,2] as well as closely related phenomena. A search on the IDEA database (http://mgravity.itsc.uah.edu/ideasearch.html) using the 'miscibility gap' keyword returned over 70 items of experiments own in microgravity conditions.…”

Section: Introductionmentioning

confidence: 89%

“…Theoretical models for calculating the equilibrium curve are available and are particularly helpful for ideal solutions, but di erences in atomic radius and in bonding are responsible for eventually large discrepancies between real and ideal behaviour [1], thus the cyclohexane-methanol equilibrium phase diagram, shown in Figure 1, is given by points. It is supposed that equilibrium always occurs at the binodal line.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of thermo‐solutal‐capillary migration of a dissolving drop in a cavity

Bassano¹

2003

Numerical Methods in Fluids

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SUMMARYIn the present paper the thermo-solutal-capillary migration of a dissolving liquid drop, composed by a binary mixture having a miscibility gap, injected in a closed cavity with di erentially heated end walls, is studied. The main goal of the analysis is to clarify if and how the drop migration is a ected by the dissolution process. The numerical code is based on a ÿnite volume formulation. A level-set technique is used for describing the dynamics of the interface separating the di erent phases. A thermodynamic constraint ÿxes the concentration jump between the interface sides. This jump, together with that of the concentration normal derivatives, in turn deÿnes the entity of the dissolution cross-ow through the interface and the interface velocity relative to the uid. Since the jump singularity of normal derivatives cannot be easily molliÿed, while retaining the necessary accuracy, a scheme for the species equation is elaborated that allows sharp jumps and has subcell resolution. Steady migration speeds are determined after the start-up phase for di erent radii and temperature di erences. The results will be used for the preparation of a sounding rocket space experiment.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of thermo‐solutal‐capillary migration of a dissolving drop in a cavity

Bassano¹

2003

Numerical Methods in Fluids

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“…This is frequently encountered due to the large density difference between the two liquid alloys of different composition which are in equilibrium within the miscibility gap, which then leads to a rapid separation when the alloy is solidified in the Earth's gravitational field. Nonetheless, some possible applications for monotectic alloys are discussed in the literature (Predel et al 1987).…”

Section: Industrial Applicationsmentioning

confidence: 99%

Segregation and immiscibility in liquid binary alloys

1997

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An overview of the thermophysical properties of segregating and demixing liquid binary alloys is presented encompassing the simple approaches that are commonly used by physicists, chemists and metallurgists in general. The various experimental and theoretical information available for such systems are put together to establish a respectable understanding between the experimental results, theoretical approaches and the empirical models.The key to understanding is the deviation that the properties exhibit from Raoult's law and the marked change in the liquid phase as a function of composition, temperature and pressure. The characteristic behaviour is ascribed to an outcome of the interplay of the energetic and structural re-adjustment of the constituent elements on mixing. After summarizing the experimental technique and some results, a comprehensive microscopic approach, based on statistical, electronic and hard sphere-like theory, is undertaken to further the understanding of the origin of the intriguing processes that are associated with the immiscible and phase-separating liquid alloys. We conclude by providing a brief account of the kinetic aspects of phase separation with some intended industrial applications.

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“…Immiscible alloys with a microstructure in which soft phases are dispersed homogeneously in a hard matrix have great potential applications in advanced bearing systems, 1 especially in the automotive industry. As exemplified by the binary Zn-Pb system in Fig.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Zn–Pb immiscible alloys obtained by a rheomixing process

Fang¹,

Fan²

2005

Materials Science and Technology

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A rheomixing process has been developed for processing immiscible metallic liquids. In this paper, a binary Zn-Pb system is used to demonstrate the rheomixing process. During the rheomixing process, liquid Zn and Pb are premixed in the miscibility gap using a propeller mixer to achieve coarse dispersion of Pb liquid droplets in Zn liquid matrix. The coarse mixture is then transferred into a twin-screw rheomixer, where it is continuously cooled down to a temperature below the monotectic temperature to form a semi-solid slurry under the intensive shear mixing action of the twin-screw rheomixer. The semi-solid slurry is finally extruded through a cylindrical extrusion die to form a continuous bar. The microstructure of immiscible alloys produced by this method is characterised by a fine dispersion of Pb particles distributed uniformly throughout a Zn matrix. The effects of rheomixing temperature and alloy composition on the resultant microstructure have been investigated. It has been found that the average size of Pb particles increases linearly with increasing rheomixing temperature and with increasing Pb concentration in the Zn-Pb alloys.

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Systems with a Miscibility Gap in the Liquid State

Cited by 21 publications

References 29 publications

Numerical simulation of thermo‐solutal‐capillary migration of a dissolving drop in a cavity

Numerical simulation of thermo‐solutal‐capillary migration of a dissolving drop in a cavity

Segregation and immiscibility in liquid binary alloys

Microstructure of Zn–Pb immiscible alloys obtained by a rheomixing process

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