Three-dimensional CFD modeling of a steam ejector

Atmaca, Mustafa; Ezgi, Cüneyt

doi:10.1080/15567036.2019.1649326

Cited by 21 publications

(4 citation statements)

References 23 publications

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“…The momentum and turbulent kinetic energy equations are discretized using a second-order upwind scheme [4] . Finally, the selection of the model, the setting of parameters, and the accuracy of the experimental results are evaluated based on the convergence of the residual plot and the mass flow rate at the outlet of the mixed fluid.…”

Section: Fluent Numerical Simulationmentioning

confidence: 99%

Three-dimensional numerical simulation and structural optimization of large steam ejectors in exhaust gas heat recovery systems

Hu,

Juan,

Wang

2024

J. Phys.: Conf. Ser.

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By establishing a three-dimensional mathematical model based on the physical characteristics of the steam ejector and utilizing computational fluid dynamics (CFD) method, this study conducted three-dimensional numerical simulations to investigate the effects of five key structural parameters, namely, the length of the nozzle diffuser section, the diameter of the nozzle outlet, the length of the contraction section in the mixing chamber, the diameter of the mixing chamber inlet, and the length of the mixing chamber throat, on the ejector performance under identical operating conditions. By fitting 50 sets of simulation data using the least squares method, analytical expressions for these structural parameters in terms of the ejection coefficient μ were obtained. Subsequently, an improved firefly algorithm was employed to identify the optimal combination of structural parameters, followed by simulation verification. The results showed that compared to the single-factor sensitivity analysis method, the improved firefly algorithm obtained a superior combination of structural parameters, resulting in a 2.03% enhancement in the ejection performance of the steam ejector.

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Section: Fluent Numerical Simulationmentioning

confidence: 99%

Three-dimensional numerical simulation and structural optimization of large steam ejectors in exhaust gas heat recovery systems

Hu,

Juan,

Wang

2024

J. Phys.: Conf. Ser.

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“…The mathematic model was selected as k-epsilon model realizable, Near Wall treatment: Standard Wall Function [9] [10]. For material information, fluid as air and solid as aluminum were defined.…”

Section: Fig6 Mesh Detailsmentioning

confidence: 99%

Numerıcal Examınatıon of Heat Exchanger Shape Effects on Thermal Effıcıency in Aır to Aır Plate Type Heat Recovery Unıt’s

Atmaca

Savat

2021

International Journal of Advances in Engineering and Pure Sciences

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Energy needs and consumption in the world is increasing steadily. For this reason, the importance of reducing energy consumption and using energy more efficiently increases day by day. Hence, energy efficiency has great importance both economically and for the protection of nature.Heat recovery device is a system that needs ventilation and can be used to save energy (reduce energy consumption) in all areas of different temperatures (home, office, cinema, shopping mall, conference room, etc.) with the outdoor environment. This device can save a significant amount of energy from heating and cooling processes by transferring heat between the exhaust air and the fresh air.The most widely used type of this device is a plate heat exchanger. In this system, heat transfer is carried out without allowing to blend the egzost air and the fresh air. In this study, the aim is to increase the thermal efficiency of the device. The geometry of the heat exchanger was changed to increase the amount of heat transfer.For this purpose, the current model was created in computer environment and computer simulations were made through the ANSYS-Fluent program. Then the new models with different geometries were created in the computer environment and simulations were made on these models using the same method. The current model and the new models have been compared in terms of thermal efficiency.

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“…Hafiz et al [22], used multivariate polynomial regression to predict the flow field inside an ejector. Mustafa & Cuneyt [23]studied the performance of a steam ejector for use in a refrigeration/heat pump system using ANSYS Fluent. Kemal, Sen, and Iskender [24] investigated the performance of gas ejectors using CFD.…”

Section: Introductionmentioning

confidence: 99%

Changes in Primary Nozzle Contours and Ejector Performance- A Numerical Study

Chukwunonso,

Humphrey,

Chukwunenye

et al. 2024

IJASE

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This study numerically investigated the changes in the behaviour of fluid flowing through an ejector in response to modifications in the nozzle design. The investigation involved constant mass flow of the primary stream through four nozzles (PN1-PN4) formed with a combination of straight lines and sine functions. The area of the nozzle streamwise section varied with each contour. The PN4 nozzle refers to the reference nozzle, and its contours were straight lines only. The velocity decay, turbulence, entrainment, and mixing data were used to measure the flow behaviour. The decay rate were increased by ≈ 1.7%, entrainment by≈ 8%, and the maximum turbulence intensity by 16% in the PN3 nozzle. Only a 0.5% increase in decay rate was recorded in PN1 and PN2.The PN3 nozzle had the lowest streamwise area of the four nozzles and performed best per entrainment and mixing. This was because the increase in the velocity of the primary stream at the nozzle trailing edge due to the reduced streamwise area, improved the momentum transfer to the secondary stream and its entrainment into the primary stream.

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Three-dimensional CFD modeling of a steam ejector

Cited by 21 publications

References 23 publications

Three-dimensional numerical simulation and structural optimization of large steam ejectors in exhaust gas heat recovery systems

Three-dimensional numerical simulation and structural optimization of large steam ejectors in exhaust gas heat recovery systems

Numerıcal Examınatıon of Heat Exchanger Shape Effects on Thermal Effıcıency in Aır to Aır Plate Type Heat Recovery Unıt’s

Changes in Primary Nozzle Contours and Ejector Performance- A Numerical Study

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