Numerical study of active mixing over a dynamic flow field in a T-jets mixer—Induction of resonance

Erkoç, Ertuğrul; Fonte, Cláudio P.; Dias, Madalena M.; Lopes, José Carlos B.; Santos, Ricardo J.

doi:10.1016/j.cherd.2015.12.002

Cited by 26 publications

(10 citation statements)

References 53 publications

(104 reference statements)

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“…Much work has been done on the flow and turbulence characteristics of the flow field in coaxial impinging stream reactors [20][21][22][23][24]. Huai et al have studied drying and flow characteristics in a semicircular impinging stream reactor.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Liu

Yue²,

et al. 2018

Energies

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Impinging stream technique has been widely used in engineering industries. Insufficient data are available on the effects of dynamic inflow conditions on the flow and turbulence characteristics of an impinging stream reactor. In this study, we investigate and discuss the flow and turbulence characteristics of an impinging stream reactor with dynamic inlet velocity variation, e.g., sinusoidal, parabolic, step or triangular variation. The effects of period, amplitude, phase difference, mean inlet velocity and type of dynamic inlet velocity variation on the motional behaviors of the impinging surface and the mean turbulence kinetic energy (k) of the impingement region are investigated and discussed using particle image velocimetry (PIV) and computational fluid dynamics (CFD) at various values of L/D (the ratio of impinging spacing to nozzle diameter). The results show that the impinging surface makes back-and-forth motions in impinging stream reactors with dynamic inlet velocity variation. The mean k of the impingement region during one period is dominated by both the inlet velocity conditions and the geometric configuration. Dynamic inflow conditions bring more turbulence energy and pulsating characteristics to impinging zones over constant inlet velocity for an instantaneously moving impinging surface. Impinging stream reactors with dynamic inlet velocity variation provides more intense turbulence properties over conventional impinging stream reactors at the same mean inlet velocity. This work shows that the impinging streams with dynamic inlet velocity variation has strong potential for future relevant reactors and processes for engineering applications.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Liu

Yue²,

et al. 2018

Energies

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“…design with injectors. [10][11][12][13][14][15][16][17] The dimensions and geometry are described below and presented in Figure 1. The diameter of the main tube (11.3 mm) in relation to the diameter of the injectors (1.59 mm) is selected based on sources for optimal mixing.…”

Section: Reactor Designmentioning

confidence: 99%

“…The diameter of the main tube (11.3 mm) in relation to the diameter of the injectors (1.59 mm) is selected based on sources for optimal mixing. [11,12,14,15] The reactor length is 165 mm long to accommodate the cross-current light source, longer than described in the cited literature. As it is longer, it is expected that chaotic mixing only occurs at the inlet and it gradually transitions to laminar flow toward the outlet.…”

Section: Reactor Designmentioning

confidence: 99%

Principles of coaxial illumination for photochemical reactions: Part 2. Model validation

Meir

Leblebici

Kuhn

et al. 2020

J Adv Manuf & Process

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This study reports the principles and model equations for co-and counter-current illumination, validated by experimental data. Current photochemical reactors which are homogeneously illuminated suffer from a light efficiency problem resulting in low light absorption and subsequent low productivity. Hence, the use of co-and counter-current illuminated reactors, implementing larger path lengths, without altering the reactor's geometry, is of interest. In this article, we report a simple model to determine the conversion obtained by co-and counter-current illumination techniques and compare against the current state-of-the-art. Via experimental validation, we report the use of co-and counter-current illumination to significantly boost the PSTY, a measure for photochemical reactor productivity, by a factor of 5 to 6 for same input concentration of reagent, solemnly by illuminating the reactor via co-and countercurrent (axially) instead of cross-current (radially). Furthermore, we report that simply increasing the reagent concentration, thus absorbance, has a large influence on productivity, thus PSTY, of the reactor. By assessing the reactor's performance parameters, derived by modeling, which are the initial absorbance value (A) and the quantum photon balance (ρϕ), the reactor's operating point can be determined and adapted to operate in a more productive and efficient regime.

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“…Another group of methods that includes, for example, solution combustion, self-propagating high-temperature synthesis (SHS), autocatalytic and other fast solidstate reactions, is based on the use of rapid synthesis [49][50][51][60][61][62][63][64][65][66][67][68][69][70][71]. Crystal growth can often be restricted by using nano-and microreactors, or synthesis methods that use spatial constraints [63,64,[72][73][74][75][76][77][78][79][80][81][82].…”

Section: Introductionmentioning

confidence: 99%

The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches

Almjasheva¹,

Ломанова²,

Попков³

et al. 2019

Nanosystems: Phys. Chem. Math.

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The minimum crystallite size in a group of oxides has been analyzed as a function of their synthesis conditions, critical nucleus size and the crystal structure parameters. Nanocrystals were synthesized by solution combustion, hydrothermal synthesis and heat treatment in air of the precipitated hydroxides. Aluminum and iron oxides, titania and zirconia, cobalt ferrite, AFeO 3 ferrites (A = Bi, RE), Aurivillius phases Bi m+1 Ti 3 Fe m−3 O 3m+3 (m = 3 -9), as well as solid solutions based on these phases were chosen as the objects of the study. The presence of a correlation between the crystalline oxide unit cell parameters and the synthesized crystals minimum size is shown. A conclusion was made about the impossibility to use only the thermodynamic concept of the critical nucleus for determining the minimum possible particle size of a new phase in some cases of oxide nanocrystals synthesis. The paper demonstrates a necessity to use crystal-chemical criteria that complement the methods of phenomenological thermodynamics and kinetics for determining the minimum possible particle size of the resulting crystalline oxide phases synthesized under the considered conditions.

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Numerical study of active mixing over a dynamic flow field in a T-jets mixer—Induction of resonance

Cited by 26 publications

References 53 publications

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Principles of coaxial illumination for photochemical reactions: Part 2. Model validation

The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches

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