Numerical study of advanced dispersion models in particle-laden swirling flows

Kazemi, S.; Adib, Mohammad; Amani, E.

doi:10.1016/j.ijmultiphaseflow.2018.01.010

Cited by 22 publications

(7 citation statements)

References 58 publications

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“…The computational time step,

Δ t_{E}

, is chosen as

5 \times 10^{- 14}

s. The values of Eulerian quantities at particle locations are interpolated with an interpolation scheme on unstructured grid using barycentric coordinates and the ion transport equations are discretized using the implicit Euler scheme. The algorithms for particle Lagrangian equations are detailed in our previous studies . The computational parcel weight,

w_{p}

, is assumed unity (real particle simulation).…”

Section: Methodsmentioning

confidence: 99%

An improved hybrid continuum‐atomistic four‐way coupled model for electrokinetics in nanofluidics

2019

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In this study, an efficient hybrid continuum‐atomistic method is proposed to study electrokinetic transport of aqueous solutions in nanofluidics. The aqueous phase is considered as a continuous phase containing immersed ion particles. The behavior of the system is then simulated through utilization of an improved hybrid continuum‐atomistic four‐way coupled approach, including the MultiPhase Particle‐In‐Cell method for the short‐ranged interaction between the ion particles, the Brownian force for the collision between the aqueous phase molecules and the ion particles, and a wall force accounting for the short‐ranged interaction of ions and walls. The validation of the proposed model with the results of Molecular Dynamics simulations suggests that this model can be a promising approach for studying the electrokinetic phenomena in more complicated geometries where the Molecular Dynamics approach is computationally prohibitive. Finally, the effects of electrokinetic parameters, such as the height of the channel, the external electric field, and bulk ionic concentration, on the electroosmotic flow in a nanochannel are investigated and discussed.

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“…The computational time step,

Δ t_{E}

, is chosen as

5 \times 10^{- 14}

w_{p}

, is assumed unity (real particle simulation).…”

Section: Methodsmentioning

confidence: 99%

An improved hybrid continuum‐atomistic four‐way coupled model for electrokinetics in nanofluidics

2019

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“…65 More details of the numerics of the Lagrangian solution algorithms can be found in the literature. 66,67…”

Section: Numerical Methods and Validationmentioning

confidence: 99%

Multi-objective optimizations of the boot injection strategy for reactivity controlled compression ignition engines

Yazdani

Amani

Naderan

2018

International Journal of Engine Research

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In this study, multi-objective optimizations of a reactivity controlled compression ignition engine are performed. The main focus is the investigation of effects of seven design variables, including swirl ratio, the first and second start of injections (SOI1 and SOI2), and four injection rate-shape parameters, on the objective parameters, namely, gross indicated efficiency, the second-law efficiency, ringing intensity, and emissions. The results show that in the low swirl ratio range (swirl ratio < 1), the emissions decrease by either increasing boot length or decreasing boot velocity. The physical analysis reveals that this is due to the penetration of the high-reactivity fuel vapor in whole squish area and a large portion of the crevice. This is because the more uniform mixture in the squish region slightly mitigates the formation of hot spots and NOx, and the propagation of reaction deeper into the crevice considerably reduces carbon monoxide and unburned hydrocarbons there. The sensitivity analysis manifests that swirl ratio has the strongest effect on all objectives, and besides swirl ratio, SOI2 has the greatest impact on gross indicated efficiency and emission, while SOI1 has the strongest influence on second-law efficiency and ringing intensity. The optimal case with an advance of SOI1 and a slight retard of SOI2, that is, a longer duration between the two injections, a lower swirl ratio (of 0.5) with respect to the base case, and appropriate injection rate-shape parameters (a high boot length and low boot velocity), achieves the gross indicated efficiency of 54% and merit function of 615.

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“…The mean velocity is interpolated at the parcel location from RANS equations; the eddy lifetime (ELT) dispersion model is applied to calculate the fluctuating velocity. In the ELT model, the fluctuating velocity u s,i is defined as [13]:…”

Section: The Lagrangian Equationsmentioning

confidence: 99%

“…Particle-laden jet flows have various engineering applications, such as fuel injection in internal combustion engines. In this regard, the jets laden with particles have been investigated by many researchers experimentally and computationally [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Many approaches have been used to experimentally analyze the jets laden with particles like Phase-Doppler Anemometry (PDA), Laser-Doppler Anemometry (LDA) and high-speed camera image processing.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Horizontal Motion of Particle-Laden Jets

2020

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Particle-laden jet flows can be observed in many industrial applications. In this investigation, the horizontal motion of particle laden jets is simulated using the Eulerian–Lagrangian framework. The two-way coupling is applied to the model to simulate the interaction between discrete and continuum phase. In order to track the continuum phase, a passive scalar equation is added to the solver. Eddy Life Time (ELT) is employed as a dispersion model. The influences of different non-dimensional parameters, such as Stokes number, Jet Reynolds number and mass loading ratio on the flow characteristics, are studied. The results of the simulations are verified with the available experimental data. It is revealed that more gravitational force is exerted on the jet as a result of the increase in mass loading, which deflects it more. Moreover, with an increase in the Reynolds number, the speed of the jet rises, and consequently, the gravitational force becomes less capable of deviating the jet. In addition, it is observed that by increasing the Stokes number, the particles leave the jet at higher speed, which causes a lower deviation of the jet.

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Numerical study of advanced dispersion models in particle-laden swirling flows

Cited by 22 publications

References 58 publications

An improved hybrid continuum‐atomistic four‐way coupled model for electrokinetics in nanofluidics

An improved hybrid continuum‐atomistic four‐way coupled model for electrokinetics in nanofluidics

Multi-objective optimizations of the boot injection strategy for reactivity controlled compression ignition engines

Investigation of the Horizontal Motion of Particle-Laden Jets

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