A modified expression for the steady-state heterogeneous nucleation rate

Fan, Yu; Qin, Fenghua; Luo, Xisheng; Zhang, Jiaoshi; Wang, Jie; Gui, Huaqiao; Liu, Jianguo

doi:10.1016/j.jaerosci.2015.05.001

Cited by 15 publications

(9 citation statements)

References 36 publications

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“…The process of heterogeneous condensation can be particularly divided into three steps, namely, nucleation, transition, and growth. ,, In order to overcome the energetic barrier, the vapor must be oversaturated. This phenomenon is commonly expressed by the parameter named supersaturation, S , defined as the ratio of the partial pressure of the condensing water vapor, P v , to its equilibrium water vapor pressure, P T 0 , at the flow temperature, T : …”

Section: Theoretical Frameworkmentioning

confidence: 99%

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Zhang

et al. 2019

Energy Fuels

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The emission of fine particles from coal-fired power plants causing environmental and human health issues is a topic of concern. The enlargement of particles seems to be a promising pretreatment technology for fine particles removal with traditional electrostatic precipitator. The effects of magnetized Tween-20 solution (MTS) by heterogeneous condensation for particle growth were carried out based on the growth tube. The experimental results indicate that the particle growth is more favored by MTS compared with water and nonmagnetized solution. Additionally, the surface tension of magnetized solution is decreased, and the wettability of particles is improved. Furthermore, more effective particle growth is presented at lower mass concentration of MTS. Meanwhile, the initial particle concentration has great influence on the larger size grown particles on magnetized solution. Numerical calculation results demonstrate that the critical supersaturation is lower, but the nucleation rate in the nucleation stage and the growth rate of clusters in the transition stage are both elevated on the condition of magnetized solution. This work reveals that the facilitating process of particle growth by magnetized wetting agent solution is a potential physical and chemical method.

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Section: Theoretical Frameworkmentioning

confidence: 99%

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Zhang

et al. 2019

Energy Fuels

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“…The mechanisms contributing to the embryo growth consist of the direct vapour deposition mechanism that represents the vapour molecules attaching themselves to an existing embryo on the particle surface and the surface diffusion mechanism representing the embryo growth when monomers that are absorbed onto the particle surface diffuse over the particle surface and eventually collide with the embryo. A method of including the contributions of both mechanisms is to use a simple addition of relevant molecule addition rates …”

Section: Model Descriptionmentioning

confidence: 99%

“…There are several theoretical attempts to model the heterogeneous nucleation, e.g. the classical nucleation theory, density functional theory, and molecular approaches . The classical nucleation theory is based on analytical solutions of kinetic equations describing the growth and decay of embryos in a metastable state, whilst the density functional theory is developed based on the assumption that the nucleating embryo on the solid surface can be treated as a heterogeneous fluid with a varying density.…”

Section: Introductionmentioning

confidence: 99%

“…By taking into account the effect of line tension and the contributions of both the direct vapour addition and the surface diffusion to the embryo growth, Luo et al developed a kinetic model to describe the heterogeneous nucleation of vapour on the insoluble spherical particle surface. Following Luo et al, Fan et al derived a modified expression for the steady‐state heterogeneous nucleation rate. Nevertheless, the integrated influence of different factors on the heterogeneous nucleation has not been systematically investigated.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of heterogeneous nucleation of water vapour on PM₁₀ for particulate abatement

et al. 2018

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A heterogeneous nucleation model with inclusions of the line tension effect, the particle roughness effect, and the surface diffusion mechanism was presented. Effects of the particle roughness and the wetting agent on the heterogeneous nucleation behaviour were examined. The scaled nucleation barrier was analyzed and subsequently implications of the nucleation behaviour in the particulate abatement by vapour condensation were discussed. It was found that the effect of particle roughness on the nucleation behaviour was greatly affected by the line tension. There existed an optimal concentration of wetting agent at which the lowest nucleation barrier and critical saturation ratio could be obtained. The surface diffusion mechanism played an overwhelmingly important role in governing the embryo growth for hydrophilic particles with a diameter D p > 0.1 mm and an embryo size smaller than the critical size, otherwise the contribution of direct vapour deposition mechanism could be significant. Based on the scaled nucleation barrier, three distinct nucleation regimes, i.e. athermal heterogeneous nucleation, thermal heterogeneous-dominant nucleation, and homogeneous-dominant nucleation, have been identified. When the contact angle was large, the wetting agent might need to be added to reduce the contact angle so as to reach the athermal heterogeneous and thermal heterogeneousdominant nucleation regimes, thus achieving efficient particulate abatement at low cost. The prediction results matched reasonably with the experimental data.

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“…Despite the considerable number of publications devoted to the problem of heterogeneous nucleation, the problem of formation of solid phases in metal melts on particles (substrates) with size of ~100 nm remains poorly understood. Most of the known works are related to the processes of ice formation in the atmosphere and aqueous solutions on impurity particles [1][2][3][4][5]. For a macroscopic description of the growth of solid phase during the heterogeneous crystallization of metals and alloys, the Johnson-Mehl-Avrami-Kolmogorov equation (JMAK) is commonly used [6 -8].…”

Section: Introductionmentioning

confidence: 99%

To theory of crystallization of nanomodified alloy

Черепанов

Cherepanova

Манолов

2017

AIP Conference Proceedings

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Abstract. On the basis of thermodynamic approach, a mathematical model of nucleation and growth of the solid phase on highly activated wettable nanoseeds is proposed. New expressions for the free energy of formation and the rate of nucleation of crystallization centers on ultradispersed seeds (nanoparticles) obtained in the model take into account the influence of dimensional and capillary effects. Numerical experiments were carried out for Al+Si alloy modified with titanium nitride nanoparticles TiN. The results of the calculations were compared with the experimental data. The study is of interest for constructing a macroscopic model and understanding the mechanisms of structure formation in the case of heterogeneous crystallization of metals and alloys.

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A modified expression for the steady-state heterogeneous nucleation rate

Cited by 15 publications

References 36 publications

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Numerical investigation of heterogeneous nucleation of water vapour on PM₁₀ for particulate abatement

To theory of crystallization of nanomodified alloy

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A modified expression for the steady-state heterogeneous nucleation rate

Cited by 15 publications

References 36 publications

Condensational Growth of Fine SiO2 Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Condensational Growth of Fine SiO2 Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Numerical investigation of heterogeneous nucleation of water vapour on PM10 for particulate abatement

To theory of crystallization of nanomodified alloy

Contact Info

Product

Resources

About

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Numerical investigation of heterogeneous nucleation of water vapour on PM₁₀ for particulate abatement