Modeling and experimental validation of subgrid scale scalar variance at high Schmidt numbers

Wojtas, Krzysztof; Orciuch, Wojciech; Wysocki, Łukasz; Makowski, Łukasz

doi:10.1016/j.cherd.2017.05.003

Cited by 11 publications

(6 citation statements)

References 23 publications

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“…To predict the chemical reaction course, the flow must initially be calculated in the computing domain. Therefore, due to transitional conditions of the flow in impinging jet reactors [12,13], the shear stress transport (SST) k-ω turbulence model was employed, and the diffusivity was defined as follows:…”

Section: Cfd Modelingmentioning

confidence: 99%

“…CA Using the determined mixture physicochemical parameters, Reynolds number values were calculated for the reactor inlet and outlet, as shown in Figure 3. Although the reactor inlet and outlet flow are both in the laminar regime, violent collisions and changes in the flow direction cause considerable turbulence in the reaction zone [13]. Therefore, a proper turbulence model must be developed to model the flow profile.…”

Section: Ca Mass Concentration [-] Ca Dynamic Viscosity [Pa S]mentioning

confidence: 99%

“…Since then, many scientific papers have used this method to control the final characteristics of chemical products by selecting the process conditions, particularly the reactant mixing conditions [3,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Molybdenum Disulphide Precipitation in Jet Reactors: Introduction of Kinetics Model for Computational Fluid Dynamics Calculations

Wojtalik¹,

Wojtas²,

Gołębiowska³

et al. 2022

Molecules

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In our previous work, we used the population balance method to develop a molybdenum disulphide kinetics model consisting of a set of differential equations and constants formulated to express the kinetics of complex chemical reactions leading to molybdenum disulphide precipitation. The purpose of the study is to improved the model to describe the occurring phenomena more thoroughly and have introduced computational fluid dynamics (CFD) modelling to conduct calculations for various reactor geometries. CFD simulations supplemented with our nucleation and growth kinetics model can predict the impact of mixing conditions on particle size with good accuracy. This introduces another engineering tool for designing efficient chemical reactors.

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Section: Cfd Modelingmentioning

confidence: 99%

Section: Ca Mass Concentration [-] Ca Dynamic Viscosity [Pa S]mentioning

confidence: 99%

See 1 more Smart Citation

Molybdenum Disulphide Precipitation in Jet Reactors: Introduction of Kinetics Model for Computational Fluid Dynamics Calculations

Wojtalik¹,

Wojtas²,

Gołębiowska³

et al. 2022

Molecules

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“…Moreover, due to the collision of the inlet streams and a rapid change in the flow direction, the flow character changes to highly turbulent. This ensures good mixing conditions and particle precipitations on the nanoscale [14][15][16][17]. Its design, based on the constant contact of new particles of the inlet streams, results in producing particles with reproducible properties.…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Engine Oil with Nano-Additives Based on MoS2 Materials

2022

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To enhance oil’s tribological and rheological properties, various nano-additives are used. An example of such a nano-additive is nanosized molybdenum disulfide (MoS2). Due to its unique properties, MoS2-based materials used as lubricants have attracted significant attention. In our previous work, we developed a novel, scalable, and low-cost method for MoS2-based materials production using an impinging jet reactor. Hybrid nanostructures based on MoS2 and carbon nanomaterials (MoS2/CNMs) decreased the friction factor of the base oil. In the present study, a mathematical model that accounts for the viscous heating effects in rheograms was formulated. The model was used to interpret the results of rheological measurements conducted for the base oil 10W40 and its mixtures with different nanosized lubricant additives. The model of the non-isothermal Couette flow allowed us to correct the rheograms of the engine oils in the region of high shear rates where viscous heating effects become significant. The temperature correlations for the consistency and flow behavior indexes were proposed. The nanohybrid suspensions of MoS2 in the base oil were found to have the lowest apparent viscosity at low temperatures, typical for the cold engine startup.

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“…Due to the good mixing conditions, materials obtained in the impinging jet reactor might show better dispersion of MoS 2 particles on the carbon surface, smaller particle size, and a lower tendency to agglomerate, which has a significant impact in advanced applications, such as catalysis. Moreover, this technique allows for the continuous production of materials with the desired properties [ 42 , 45 , 46 , 47 , 48 , 49 ]. The aim of the conducted research was to examine if impinging jet reactors can be used for preparation of MoS 2 /GO hybrid structures with enhanced properties compared to the more commonly used semi-batch reactor.…”

Section: Introductionmentioning

confidence: 99%

Production and Properties of Molybdenum Disulfide/Graphene Oxide Hybrid Nanostructures for Catalytic Applications

Bojarska

Mazurkiewicz-Pawlicka

Gierlotka

et al. 2020

Nanomaterials

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Molybdenum disulfide (MoS2) can be an excellent candidate for being combined with carbon nanomaterials to obtain new hybrid nanostructures with outstanding properties, including higher catalytic activity. The aim of the conducted research was to develop the novel production method of hybrid nanostructures formed from MoS2 and graphene oxide (GO). The nanostructures were synthesized in different weight ratios and in two types of reactors (i.e., impinging jet and semi-batch reactors). Physicochemical analysis of the obtained materials was carried out, using various analytical techniques: particle size distribution (PSD), thermogravimetric analysis (TGA), FT-IR spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Due to the potential application of materials based on MoS2 as the catalyst for hydrogen evolution reaction, linear sweep voltammetry (LSV) of the commercial MoS2, synthesized MoS2 and the obtained hybrid nanostructures was performed using a three-electrode system. The results show that the developed synthesis of hybrid MoS2/GO nanostructures in continuous reactors is a novel and facile method for obtaining products with desired properties. The hybrid nanostructures have shown better electrochemical properties and higher onset potentials compared to MoS2 nanoparticles. The results indicate that the addition of carbon nanomaterials during the synthesis improves the activity and stability of the MoS2 nanoparticles.

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Modeling and experimental validation of subgrid scale scalar variance at high Schmidt numbers

Cited by 11 publications

References 23 publications

Molybdenum Disulphide Precipitation in Jet Reactors: Introduction of Kinetics Model for Computational Fluid Dynamics Calculations

Molybdenum Disulphide Precipitation in Jet Reactors: Introduction of Kinetics Model for Computational Fluid Dynamics Calculations

Rheological Properties of Engine Oil with Nano-Additives Based on MoS2 Materials

Production and Properties of Molybdenum Disulfide/Graphene Oxide Hybrid Nanostructures for Catalytic Applications

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