Numerical investigation of convective dropwise condensation flow by a hybrid thermal lattice Boltzmann method

Zheng, Shao-Fei; Eimann, Ferdinand; Fieback, Tobias; Xie, Gongnan; Groß, Ulrich

doi:10.1016/j.applthermaleng.2018.09.076

Cited by 34 publications

(21 citation statements)

References 53 publications

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“…Flekkoy [20] and Shan and Chen [21,22] developed a pseudopotential LB model, this model properly takes account the momentum exchange between the species by pseudopotential interactions. The thermal pseudopotential LB method was firstly attributed by Zhang and Chan [23], then Li et al [24] developed a hybrid thermal LB-MRT model considering the vapor-liquid phase change and this model was extended to the multicomponent LB model by Zheng et al [25,26]. The models introduced above have been well studied by many authors, however, these models have various shortcomings.…”

Section: Introductionmentioning

confidence: 99%

Modeling reacting multi-species flows with a detailed multi-fluid lattice Boltzmann scheme

et al. 2021

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Recent advances and findings reported in the literature show that the lattice Boltzmann (LB) method can be a viable and rather efficient alternative to classical numerical methods in modeling multi-species flows. Based on the kinetic theory of multicomponent gases, multi-fluid approaches are derived. Each species evolves according to the specific properties, a proper coupling must be introduced for modeling the diffusivity. In recent years, a discrete kinetic scheme for multi-component flows has been proposed which was able to solve the Maxwell-Stefan system of equations for any number of species. However, reacting flows lead to additional challenges and have seldom been studied by LB method. The aim of the present work is to implement this model in the LB solver, extend it to take account multiple chemical reactions. The temperature is modeled through separate distribution function and the flow distribution function is assumed to be independent of temperature. The performance has been checked for a binary diffusion flow and a counter-current propane/air reacting flow. The obtained results show that this model able to deal with multi-species flows and solves the multi-component system of equations

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Section: Introductionmentioning

confidence: 99%

Modeling reacting multi-species flows with a detailed multi-fluid lattice Boltzmann scheme

et al. 2021

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“…Ashrafi and Moosavi 33 and Guo and Cheng 34 recently investigated the droplet condensation on structured surfaces. Some investigations 34,35 also took into consideration the effect of noncondensable gas and external convection. However, little attention was paid to the effect of heterogeneous surface wettability, i.e.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann simulation of droplet condensation on a surface with wettability gradient

Shen

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a free energy lattice Boltzmann model of vapor condensation on a surface with a wettability gradient is developed and numerically analyzed to understand the microscopic behaviors of self-propelled droplet condensation. The effect of wettability gradient on droplet self-motion and coalescence as well as vapor condensation is examined and investigated. The condensation rate is presented during the whole droplet condensation process to analyze the role of wettability gradient on droplet condensation. The results indicate that the surface with wettability gradient is preferred for vapor condensation owing to the appearance of self-propelled droplet condensation. Condensate film is initially spread on the high surface energy region, and liquid nucleation sites form, grow and, subsequently, coalesce with other droplets on low surface energy regions. The condensation rate is higher on a surface with a larger wettability gradient due to the more effective removal of condensate. In addition, the condensation rate fluctuates with time at the quasi-steady-state stage. During the condensation process, the droplet coalescence triggers a sudden peak of condensation rate, and the generation of new nucleation results in a rapid increase in the condensation rate.

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“…Liu et al [33] used a kinetic model based on multiple temperatures for gas flows at the micro level. Zheng et al [34] implemented a hybrid thermal lattice Boltzmann method to investigate dropwise Surface treatment deals with the coating or alteration of surface structure at fine scale from the micro-to nanoscale. Recent developments in the field of micro-nano manufacturing and surface functionalization have expanded the boundaries for heat transfer enhancement through surface treatment and modification [20][21][22].…”

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confidence: 99%

“…Liu et al [33] used a kinetic model based on multiple temperatures for gas flows at the micro level. Zheng et al [34] implemented a hybrid thermal lattice Boltzmann method to investigate dropwise condensation (DWC). Although experimental and theoretical work is of equal importance, the focus of this paper is oriented towards experiments involving DWC enhancements.…”

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confidence: 99%

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Review of Micro–Nanoscale Surface Coatings Application for Sustaining Dropwise Condensation

et al. 2019

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Condensation occurs in most of the heat transfer processes, ranging from cooling of electronics to heat rejection in power plants. Therefore, any improvement in condensation processes will be reflected in the minimization of global energy consumption, reduction in environmental burdens, and development of sustainable systems. The overall heat transfer coefficient of dropwise condensation (DWC) is higher by several times compared to filmwise condensation (FWC), which is the normal mode in industrial condensers. Thus, it is of utmost importance to obtain sustained DWC for better performance. Stability of DWC depends on surface hydrophobicity, surface free energy, condensate liquid surface tension, contact angle hysteresis, and droplet removal. The required properties for DWC may be achieved by micro–nanoscale surface modification. In this survey, micro–nanoscale coatings such as noble metals, ion implantation, rare earth oxides, lubricant-infused surfaces, polymers, nanostructured surfaces, carbon nanotubes, graphene, and porous coatings have been reviewed and discussed. The surface coating methods, applications, and enhancement potential have been compared with respect to the heat transfer ability, durability, and efficiency. Furthermore, limitations and prevailing challenges for condensation enhancement applications have been consolidated to provide future research guidelines.

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Numerical investigation of convective dropwise condensation flow by a hybrid thermal lattice Boltzmann method

Cited by 34 publications

References 53 publications

Modeling reacting multi-species flows with a detailed multi-fluid lattice Boltzmann scheme

Modeling reacting multi-species flows with a detailed multi-fluid lattice Boltzmann scheme

Lattice Boltzmann simulation of droplet condensation on a surface with wettability gradient

Review of Micro–Nanoscale Surface Coatings Application for Sustaining Dropwise Condensation

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