Nonlinear algebraic Reynolds stress model for two-phase turbulent flows laden with small heavy particles

Mukin, Roman; Zaichik, L. I.

doi:10.1016/j.ijheatfluidflow.2011.11.002

Cited by 25 publications

(15 citation statements)

References 44 publications

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“…The analysis of our calculation data and the experimental data [11] suggests that the effect of the dispersed phase on the change in the averaged gas velocity is insignificant throughout the channel length. Analogous results were obtained in recent numerical works [23][24][25]. The axial gas velocity in the two-phase flow is slightly higher than that in the single-phase flow at y/H > 1.5 in the calculated sections x/H = 9 and 14.…”

Section: Comparative Analysis With Measurement Datasupporting

confidence: 89%

“…One can conclude that turbulence suppression is observed mainly in the flow core where particles are present, whereas in the case of x/H < 7 there are virtually no particles in the separated flow zone at Stk > 1. This is typical also for the measurements of [11], recent calculations [25], and present calculations. While in the flow relaxation region at x/H = 14, particles occupy the whole cross section of the channel (see Fig.…”

Section: Comparative Analysis With Measurement Datasupporting

confidence: 85%

“…Upon comparative analysis, the experimental and calculated data [11,25] on the flow structure of air mixed with solid particles downstream of the planar backward-facing step in the isothermal flow were used. The good agreement with the experimental data suggests the validity of the designed calculation model of separated two-phase flow downstream of a sudden pipe expansion.…”

Section: Comparative Analysis With Measurement Datamentioning

confidence: 99%

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The effect of drop evaporation on gas turbulence and heat transfer for two-phase flow behind sudden pipe expansion

Пахомов

Терехов

2016

High Temp

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The effect of drop evaporation on turbulence and heat transfer in a two-phase separated axisymmetric flow was studied numerically. The comparison between the calculation data for evaporating and nonevaporating particles under otherwise identical conditions is given. In the zone adjacent to the wall, drop evaporation was shown to proceed most intensively and almost no suppression of turbulence was observed in this case. The turbulence level is close to that in a single-phase flow regime. In the flow core where virtually no evaporation occurs, there was a decrease in the gas turbulence level (down to 15% compared to singlephase flow).

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Section: Comparative Analysis With Measurement Datasupporting

confidence: 89%

Section: Comparative Analysis With Measurement Datasupporting

confidence: 85%

Section: Comparative Analysis With Measurement Datamentioning

confidence: 99%

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The effect of drop evaporation on gas turbulence and heat transfer for two-phase flow behind sudden pipe expansion

Пахомов

Терехов

2016

High Temp

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“…Recently Mukin and Zaichik (2012) have proposed a nonlinear algebraic Reynolds stress model for the gas flow laden with small heavy particles based on the PDF approach. The original equations written for each component of the Reynolds stress were reduced to their general form in terms of the turbulence energy and its dissipation rate with additional effect of the particulate phase.…”

Section: Introductionmentioning

confidence: 99%

“…The original equations written for each component of the Reynolds stress were reduced to their general form in terms of the turbulence energy and its dissipation rate with additional effect of the particulate phase. Eventually, the model by Mukin and Zaichik (2012) operated with the k ε − solution and did not allow analysis of the effect of particles on each component of the Reynolds stress.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of grid-generated turbulent particulate flow by three-dimensional Reynolds stress

Kartushinsky¹,

Rudi²,

Stock³

et al. 2013

Proc. Estonian Acad. Sci.

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A three-dimensional (3D) Reynolds stress turbulence model based on 3D Reynolds-averaged Navier-Stokes equations has been elaborated for grid-generated turbulence in particulate downward flow arranged in the channel domain of the square cross section. The model presented considers both the enhancement and attenuation of turbulence by means of the additional terms of the transport equations of the normal Reynolds stress components. It allows us to carry out calculations covering the long distance of the channel length without using algebraic assumptions for various components of the Reynolds stress. The results obtained show the effects of particles and mesh size of the turbulence generating grids on turbulence modification. In particular, the presence of solid particles at the initial period of turbulence decay results in the pronounced enhancement of turbulence that diminishes appreciably downwards in the area of typical channel turbulent flow. As the results show, the character of modification of all three normal components of the Reynolds stress taking place at the initial period of turbulence decay are uniform almost all over the channel cross sections. The increase in the grid mesh size slows down the rate of the turbulence enhancement which is caused by particles.There are different approaches and numerical models that describe the mutual effect of gas turbulence and particles. The k ε − models, earlier elaborated for turbulent particulate flows, e.g., Elghobashi and Abou-Arab (1983), Pourahmadi and Humphrey (1983), Rizk and Elghobashi (1989), Simonin (1990), Deutsch and Simonin (1991), considered turbulence attenuation only by the additional terms of the equations of the turbulence kinetic energy and its dissipation rate. The results obtained by these models were validated by the experimental data on turbulent particulate free-surface flows (Shraiber et al., 1990).The models by Crowe and Gillandt (1998) and Crowe (2000) considered both the turbulence augmentation and attenuation in pipe particulate flows depending on the flow mass loading and the Stokes number. Later on these models have been expanded for free-surface flows. As opposed to the k ε

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The Effect of Droplets Evaporation on Turbulence Modification and Heat Transfer Enhancement in a Two-Phase Mist Flow Downstream of a Pipe Sudden Expansion

Пахомов

Терехов

2016

Flow Turbulence Combust

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Nonlinear algebraic Reynolds stress model for two-phase turbulent flows laden with small heavy particles

Cited by 25 publications

References 44 publications

The effect of drop evaporation on gas turbulence and heat transfer for two-phase flow behind sudden pipe expansion

The effect of drop evaporation on gas turbulence and heat transfer for two-phase flow behind sudden pipe expansion

Numerical simulation of grid-generated turbulent particulate flow by three-dimensional Reynolds stress

The Effect of Droplets Evaporation on Turbulence Modification and Heat Transfer Enhancement in a Two-Phase Mist Flow Downstream of a Pipe Sudden Expansion

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