Gas-Solid Flow Through Ejector

Mahmoud, N. H.; Hamed, Mofreh H.; Abdel-Hamied, A. A.; Hussien, Ahmed A.

doi:10.21608/erjm.2007.69895

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…As seen from Table 1 and according to [1] the mixing tube length has significant effect on the mixing of the primary and secondary flows. Ejector performance of [6,7] was carried out for different ejector geometries with fixed mixing tube length 10 times the mixing tube diameter. In the experimental investigation given in [8], the results showed that mixing tube length seems to have no obvious effect and changes of L/D ratio from 2 to10 results give in a slight decrease in the efficiency of ejector.…”

Section: -Introductionmentioning

confidence: 99%

Study of the Configuration and Performance of Air-Air Ejectors Based on CFD Simulation

Elzahaby¹,

Hamed²,

Omara³

et al. 2015

ERJ. Engineering Research Journal

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This paper describes a numerical study of gas-gas ejector (jet pump) performance. The developed model used to study performance determination for different operating conditions and geometrical configurations of ejector. The performance of ejector obtained based on a simulation procedure of linearized and axisymmetric subsonic and supersonic flow using Fluent Package. The CFD model used to evaluate the performance of three different ejector geometries that tested under different working conditions. A conventional finite-volume scheme utilized to solve two-dimensional transport equations with the standard k-ω SST turbulence model. The model is solved in three regions namely, the primary flow nozzle, the secondary flow channel, and the region of interaction between the supersonic nozzle jet and the secondary flow. The effect of the mixing part and tail section (pipe or diffuser) geometries on the ejector performance studied. In addition, the effects of gas motive pressure on the static pressure distributions are also studied. The computational results are validated using published experimental data, where acceptable agreements exist. The numerical results indicate that the ejector geometry has a pronounced effect on the flow parameters (i.e., pressure and gas velocity) and the ejector performance. In addition, predicted numerical results indicate that when the motive-stream velocity exceeds the speed of sound, shock waves are unavoidable inside ejectors and that shock wave pattern in mixing part has a dominant effect on ejector performance. In addition, the results indicate that the shock location inside the nozzle and the separation point are affected by the motive pressure. The results show also that configuration with convergent-divergent mixing section is much better for mixing process than the other tested configurations.

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Section: -Introductionmentioning

confidence: 99%

Study of the Configuration and Performance of Air-Air Ejectors Based on CFD Simulation

Elzahaby¹,

Hamed²,

Omara³

et al. 2015

ERJ. Engineering Research Journal

View full text Add to dashboard Cite

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Analysis of the Multiphase Flow With Condensation in the Two-Phase Ejector Condenser Using Computational Fluid Dynamics Modeling

Kuś,

Madejski

2024

Journal of Energy Resources Technology

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The liquid-driven two-phase ejector condenser is the object of the numerical investigation. The spray-ejector condenser is a device and one of the critical components of the developed gas power plant with negative CO2 emission. The task of the ejector is to entrain gas and condense steam contained in the mixture of exhaust gases. CFD modelling allows analysing complex phenomena and predicting the influence of a wide range of operating parameters on the local structure of the multiphase flow with condensation. The geometrical model of the ejector was designed to provide efficient steam condensation and generate sub pressure region at the gas inlet. The 2D, axisymmetric CFD model was created using Simcenter STAR CCM+ software. The multiphase Mixture model was used to take into account two-phase flow. Turbulence was computed using k-ω SST model. Direct contact condensation of steam was calculated using two different approaches: the Spalding/Evaporation model and the thermally-driven Boiling/Condensation model. The influence of various gas inlet velocity and the presence of CO2 on the operation of the ejector condenser was investigated based on scalar fields and charts representing changes in the most important variables along the flow path. The condensation is the most intense in the suction chamber. The Boiling/Condensation model predicts lower suction pressure and higher condensation effectivity than Spalding/Evaporation model. The CO2 considerably affects the pressure and temperature distributions and reduces the condensation rate.

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Gas-Solid Flow Through Ejector

Cited by 2 publications

References 4 publications

Study of the Configuration and Performance of Air-Air Ejectors Based on CFD Simulation

Study of the Configuration and Performance of Air-Air Ejectors Based on CFD Simulation

Analysis of the Multiphase Flow With Condensation in the Two-Phase Ejector Condenser Using Computational Fluid Dynamics Modeling

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