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Re-analysis of the critical nucleation work in the case of diffusive interface

Progress in Natural Science:Materials International 2012年第2期22卷 100-107页

作者： Ke Zhang,Feng Liu,Gencang Yang State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,Shaanxi 710072,PR China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an Shaanxi 710072 PR China

Regarding the inherent limitations of previous thermodynamic description on nucleation,the nucleation work has been re-analyzed for undercooled melts by introducing temperatureand position-dependent thermodynamic quantities in the diffusive *** the small undercoolings,the obtained critical nucleation work matches that derived from the classical nucleation *** the increasing undercooling,the nucleation work approaches and finally becomes smaller than that from the published theories based on the diffusive *** the critical nucleation work predicted by the present approach into the steady-state homogeneous nucleation rate,the nucleation rates for pure Hg and Ga have been *** is shown that the results from the present approach fit the experimental values much better than those from the classical nucleation ***,for some metals or alloys,the temperature at which the nucleation work vanishes can be predicted using the present approach.

关键词： Nucleation diffusive interface Nucleation work Interfacial energy

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Solute trapping model based on solute drag treatment

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Transactions of Nonferrous Metals Society of China 2010年第5期20卷 877-881页

作者：王海丰刘峰陈正杨伟 State Key Laboratory of Solidification Processing Northwestern Polytechnical University

A solute trapping model is developed based on a so-called solute drag *** adopting a basic approach of phase-field models,and defining the free energy density in the interfacial region,a suitable interface shape function is introduced to derive the current model,in which the equilibrium and non-equilibrium interface behaviours can be described using a dimensionless parameter L (*** important parameter in the present interface shape function).When applying the current model to Si-9%As (molar fraction) alloy with L=0.5,a good prediction of the steeper profile for high interface velocity,which is analogous to that using a phase-field model of DANILOV and NESLTER,has been obtained.

关键词： solute trapping solute drag diffusive interface

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Simulation of Seawater Intrusion in Coastal Confined Aquifer Using a Point Collocation Method Based Meshfree Model

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Journal of Water Resource and Protection 2016年第4期8卷 534-549页

作者： Alice Thomas T. I. Eldho A. K. Rastogi Research Scholar Department of Civil Engineering Indian Institute of Technology Bombay Mumbai India Department of Civil Engineering Indian Institute of Technology Bombay Mumbai India

Seawater intrusion caused by groundwater over-exploitation from coastal aquifers poses a severe problem in many regions. Formulation of proper pumping strategy using a simulation model can assure sustainable supply of fresh water from the coastal aquifers. The focus of the present study is on the development of a numerical model based on Meshfree (MFree) method to study the seawater intrusion problem. For the simulation of seawater intrusion problem, widely used models are based on Finite Difference (FDM) and Finite Element (FEM) Methods, which demand well defined grids/meshes and considerable pre-processing efforts. Here, MFree Point Collocation Method (PCM) based on the Radial Basis Function (RBF) is proposed for the simulation. diffusive interface approach with density-dependent dispersion and solution of flow and solute transport is adopted. These equations are solved using PCM with appropriate boundary conditions. The developed model has been verified with Henry’s problem, and found to be satisfactory. Further the model has been applied to another established problem and an attempt is made to examine the influence of important system parameters including pumping and recharge on the seawater intrusion. The PCM based MFree model is found computationally efficient as preprocessing is avoided when compared to other numerical methods.

关键词： Confined Aquifer Seawater Intrusion Meshfree Method Point Collocation Method diffusive interface

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