Modelling the interfacial flow of two immiscible liquids in mixing processes

Abstract

This paper presents an interface tracking method for modelling the flow of immiscible metallic liquids in mixing processes. The methodology can provide an insight into mixing processes for studying the fundamental morphology development mechanisms for immiscible interfaces. The volume-of-fluid (VOF) method is adopted in the present study, following a review of various modelling approaches for immiscible fluid systems. The VOF method employed here utilises the piecewise linear for interface construction scheme as well as the continuum surface force algorithm for surface force modelling. A model coupling numerical and experimental data is established. The main flow features in the mixing process are investigated. It is observed that the mixing of immiscible metallic liquids is strongly influenced by the viscosity of the system, shear forces and turbulence. The numerical results show good qualitative agreement with experimental results, and are useful for optimisating the design of mixing casting processes.

Solidification of Al-Sn-Cu Based Immiscible Alloys under Intense Shearing

“…A detailed explanation of fluid flow in the MCAST unit is described elsewhere. [8,14,[19][20][21][22][23][24] Before beginning the experiments, the MCAST unit was heated to the semisolid region (processing temperature, T p ) of the alloy to be used. The melt was poured into the MCAST unit well above T c to avoid liquidphase separation before shearing commences.…”

Free surface flow in the mixing zone of an annular centrifugal contactor

“…The VOF technique is widely used for modeling interfacial flows and is capable of capturing complex interface dynamics including interface breakage and reattachment. 30,31 The continuum surface force model 32 was also used to account for surface tension effects on the air-water interface. The CFD modeling was done with Fluent 6.3 in parallel on $16, 1.3 GHz nodes in a Linux cluster.…”

Droplets size evolution of dispersion in a stirred tank

“…extraction, catalytic reactions, polymerization etc.). The dynamic evolution of droplet size distribution in time inside an agitated vessel has been investigated by many researchers [1][2][3][4][5]. They tried to develop a simple model of droplet size distribution developing in time and depending on parameters of the mixing system.…”

“…They tried to develop a simple model of droplet size distribution developing in time and depending on parameters of the mixing system. The agitated vessel geometry or impeller types were also examined [5,4]. Several approaches applying of population balance modelling [6][7][8][9] were used.…”