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Articles de revues sur le sujet « CFD modelling for gas coolers »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 17 février 2022

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1

Zhang, Xinyu, Yunting Ge, Jining Sun, Liang Li et Savvas A. Tassou. « CFD Modelling of Finned-tube CO2 Gas Cooler for Refrigeration Systems ». Energy Procedia 161 (mars 2019) : 275–82. http://dx.doi.org/10.1016/j.egypro.2019.02.092.

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Adeniyi, A. A., H. P. Morvan et K. A. Simmons. « A coupled Euler-Lagrange CFD modelling of droplets-to-film ». Aeronautical Journal 121, n^o 1246 (13 octobre 2017) : 1897–918. http://dx.doi.org/10.1017/aer.2017.107.

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ABSTRACTIn this paper, a droplet to film interaction model technique is presented. In the proposed approach, the liquid and gas continua are modelled using an enhanced Volume-of-Fluid (VoF) technique while the droplets are tracked using a Lagrangian framework and are coupled to the Eulerian phases using source terms. The eventual target application is an aeroengine bearing chamber in which oil is found as droplets, shed from the bearings, splashing on impact, separated from wall surfaces at obstacles or simply re-entrained, and as a continuum oil film coating the bearing chamber outer walls which it also cools. In finite volume Computational Fluid Dynamics (CFD) techniques, a prohibitively large number of cells would be required to describe the details of the droplet impact phenomenon. Based on published correlations, the splashing droplets are created and tracked as Lagrangian particles. The flowing film and the gas continua are handled with an enhanced VoF technique.

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Orosz, Gergely Imre, et Attila Aszódi. « CFD modelling of mixing vane spacer grids for ALLEGRO relevant gas cooled reactor fuel geometry ». Annals of Nuclear Energy 164 (décembre 2021) : 108628. http://dx.doi.org/10.1016/j.anucene.2021.108628.

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Javiya, Umesh, John Chew, Nick Hills et Timothy Scanlon. « Coupled FE–CFD thermal analysis for a cooled turbine disk ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 229, n^o 18 (18 février 2015) : 3417–32. http://dx.doi.org/10.1177/0954406215572430.

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This paper presents transient aero-thermal analysis for a gas turbine disk and the surrounding air flows through a transient slam acceleration/deceleration “square cycle” engine test, and compares predictions with engine measurements. The transient solid–fluid interaction calculations were performed with an innovative coupled finite element (FE) and computational fluid dynamics (CFD) approach. The computer model includes an aero-engine high pressure turbine (HPT) disk, adjacent structure, and the surrounding internal air system cavities. The model was validated through comparison with the engine temperature measurements and is also compared with industry standard standalone FE modelling. Numerical calculations using a 2D FE model with axisymmetric and 3D CFD solutions are presented and compared. Strong coupling between CFD solutions for different air system cavities and the FE solid model led to some numerical difficulties. These were addressed through improvement of the coupling algorithm. Overall performance of the coupled approach is very encouraging giving temperature predictions as good as a traditional model that had been calibrated against engine measurements.

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Zhang, X. Y., Y. T. Ge et J. N. Sun. « Performance analysis of finned-tube CO2 gas cooler with advanced 1D-3D CFD modelling development and simulation ». Applied Thermal Engineering 176 (juillet 2020) : 115421. http://dx.doi.org/10.1016/j.applthermaleng.2020.115421.

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Kukutla, Pol, et B. Prasad. « Coupled flow network model and CFD analysis for a combined impingement and film cooled gas turbine nozzle guide vane ». Modelling, Measurement and Control B 86, n^o 1 (30 mars 2017) : 250–70. http://dx.doi.org/10.18280/mmc_b.860118.

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Rossetti, Antonio, Sergio Marinetti et Silvia Minetto. « Multi-physics simulation of CO2 gas coolers using equivalence modelling ». International Journal of Refrigeration 90 (juin 2018) : 99–107. http://dx.doi.org/10.1016/j.ijrefrig.2018.04.013.

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Al-Rashed, Mohsen H., et Alan G. Jones. « CFD modelling of gas–liquid reactive precipitation ». Chemical Engineering Science 54, n^o 21 (novembre 1999) : 4779–84. http://dx.doi.org/10.1016/s0009-2509(99)00194-3.

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Mangra, A. C. « Micro gas turbine combustion chamber CFD modelling ». IOP Conference Series : Materials Science and Engineering 916 (11 septembre 2020) : 012064. http://dx.doi.org/10.1088/1757-899x/916/1/012064.

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Zilio, Claudio, et Simone Mancin. « Shell and tube carbon dioxide gas coolers – Experimental results and modelling ». International Journal of Refrigeration 56 (août 2015) : 224–34. http://dx.doi.org/10.1016/j.ijrefrig.2015.04.006.

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Śmierciew, Kamil, Jerzy Gagan et Dariusz Butrymowicz. « Numerical modelling of air-cooler using simplified methods ». E3S Web of Conferences 70 (2018) : 02015. http://dx.doi.org/10.1051/e3sconf/20187002015.

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The fin-and-tube air coolers have been extensively used in refrigeration systems applied to cold storage chambers. The performance of the heat exchanger affects the efficiency of the systems and makes the study of heat exchanger becomes important. Prediction of the temperature, humidity, as well as velocity distribution in cold storage chamber requires accurate prediction of operation of the finned air cooler. The presence of the air cooler unit is usually taken into account by the investigators, but with very simplified geometry and physics. Results of numerical modelling using the computational fluid dynamics (CFD) software ANSYS FLUENT of fin-and-tube air cooler is presented in the paper. Two different approaches were used: the Dual Cell Model and porous media model.

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12

Chai, Lei, Konstantinos M. Tsamos et Savvas A. Tassou. « Modelling and Evaluation of the Thermohydraulic Performance of Finned-Tube Supercritical Carbon Dioxide Gas Coolers ». Energies 13, n^o 5 (25 février 2020) : 1031. http://dx.doi.org/10.3390/en13051031.

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This paper investigates the thermohydraulic performance of finned-tube supercritical carbon dioxide (sCO2) gas coolers operating with refrigerant pressures near the critical point. A distributed modelling approach combined with the ε-NTU method has been developed for the simulation of the gas cooler. The heat transfer and pressure drop for each evenly divided segment are calculated using empirical correlations for Nusselt number and friction factor. The model was validated against test results and then used to investigate the influence of design and operating parameters on local and overall gas cooler performance. The results show that the refrigerant heat-transfer coefficient increases with decreasing temperature and reaches its maximum close to the pseudocritical temperature before beginning to decrease. The pressure drop increases along the flow direction with decreasing temperature. Overall performance results illustrate that higher refrigerant mass flow rate and decreasing finned-tube diameter lead to improved heat-transfer rates but also increased pressure drops. Design optimization of gas coolers should take into consideration their impact on overall refrigeration performance and life cycle cost. This is important in the drive to reduce the footprint of components, energy consumption, and environmental impacts of refrigeration and heat-pump systems. The present work provides practical guidance to the design of finned-tube gas coolers and can be used as the basis for the modelling of integrated sCO2 refrigeration and heat-pump systems.

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Santosa, IDewa M. C., Konstantinos M. Tsamos, Baboo L. Gowreesunker et Savvas A. Tassou. « Experimental and CFD investigation of overall heat transfer coefficient of finned tube CO2 gas coolers ». Energy Procedia 161 (mars 2019) : 300–308. http://dx.doi.org/10.1016/j.egypro.2019.02.096.

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Zhang, Xinyu, Yunting Ge et Jining Sun. « CFD performance analysis of finned-tube CO2 gas coolers with various inlet air flow patterns ». Energy and Built Environment 1, n^o 3 (juillet 2020) : 233–41. http://dx.doi.org/10.1016/j.enbenv.2020.02.004.

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Fiates, Juliane, Raphael Ribeiro Cruz Santos, Fernando Fernandes Neto, Artur Zaghini Francesconi, Vinicius Simoes et Sávio S. V. Vianna. « An alternative CFD tool for gas dispersion modelling of heavy gas ». Journal of Loss Prevention in the Process Industries 44 (novembre 2016) : 583–93. http://dx.doi.org/10.1016/j.jlp.2016.08.002.

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Taha, Taha, et Z. F. Cui. « CFD modelling of gas-sparged ultrafiltration in tubular membranes ». Journal of Membrane Science 210, n^o 1 (décembre 2002) : 13–27. http://dx.doi.org/10.1016/s0376-7388(02)00360-5.

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McKenna, T. F., D. Cokljat et P. Wild. « CFD Modelling of heat transfer during gas phase olefin polymerisation ». Computers & ; Chemical Engineering 22 (mars 1998) : S285—S292. http://dx.doi.org/10.1016/s0098-1354(98)00066-0.

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Kim, Seong Cheon, et Young Nam Chun. « CFD modelling of electrohydrodynamic gas flow in an electrostatic precipitator ». International Journal of Environment and Pollution 36, n^o 4 (2009) : 337. http://dx.doi.org/10.1504/ijep.2009.023661.

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19

Coroneo, M., G. Montante, M. Giacinti Baschetti et A. Paglianti. « CFD modelling of inorganic membrane modules for gas mixture separation ». Chemical Engineering Science 64, n^o 5 (mars 2009) : 1085–94. http://dx.doi.org/10.1016/j.ces.2008.10.065.

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Both, A. L., G. Atanga et H. Hisken. « CFD modelling of gas explosions : Optimising sub-grid model parameters ». Journal of Loss Prevention in the Process Industries 60 (juillet 2019) : 159–73. http://dx.doi.org/10.1016/j.jlp.2019.04.008.

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Schmidtke, Martin, et Dirk Lucas. « CFD Approaches for Modelling Bubble Entrainment by an Impinging Jet ». Science and Technology of Nuclear Installations 2009 (2009) : 1–12. http://dx.doi.org/10.1155/2009/148436.

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This contribution presents different approaches for the modeling of gas entrainment under water by a plunging jet. Since the generation of bubbles happens on a scale which is smaller than the bubbles, this process cannot be resolved in meso-scale simulations, which include the full length of the jet and its environment. This is why the gas entrainment has to be modeled in meso-scale simulations. In the frame of a Euler-Euler simulation, the local morphology of the phases has to be considered in the drag model. For example, the gas is a continuous phase above the water level but bubbly below the water level. Various drag models are tested and their influence on the gas void fraction below the water level is discussed. The algebraic interface area density (AIAD) model applies a drag coefficient for bubbles and a different drag coefficient for the free surface. If the AIAD model is used for the simulation of impinging jets, the gas entrainment depends on the free parameters included in this model. The calculated gas entrainment can be adapted via these parameters. Therefore, an advanced AIAD approach could be used in future for the implementation of models (e.g., correlations) for the gas entrainment.

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Song, Tao, Kaixi Jiang, Junwu Zhou, Deyu Wang, Ning Xu et Yuqing Feng. « CFD modelling of gas–liquid flow in an industrial scale gas-stirred leaching tank ». International Journal of Mineral Processing 142 (septembre 2015) : 63–72. http://dx.doi.org/10.1016/j.minpro.2015.01.005.

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Gilham, S., D. M. Deaves et P. Woodburn. « Mitigation of dense gas releases within buildings : validation of CFD modelling ». Journal of Hazardous Materials 71, n^o 1-3 (janvier 2000) : 193–218. http://dx.doi.org/10.1016/s0304-3894(99)00079-5.

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Dapelo, Davide, Federico Alberini et John Bridgeman. « Euler-Lagrange CFD modelling of unconfined gas mixing in anaerobic digestion ». Water Research 85 (novembre 2015) : 497–511. http://dx.doi.org/10.1016/j.watres.2015.08.042.

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Kolokotroni, M., N. Saiz et J. Littler. « Moisture movement : A study using tracer gas techniques and CFD modelling ». Building Services Engineering Research and Technology 13, n^o 2 (mai 1992) : 113–17. http://dx.doi.org/10.1177/014362449201300209.

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Boroń, Sylwia, Wojciech Węgrzyński, Przemysław Kubica et Lech Czarnecki. « Numerical Modelling of the Fire Extinguishing Gas Retention in Small Compartments ». Applied Sciences 9, n^o 4 (15 février 2019) : 663. http://dx.doi.org/10.3390/app9040663.

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Active fire protection systems are critical elements of good process safety. Among them, gaseous extinguishing systems provide quick, clean suppression and prolonged protection due to long retention process of the gas. Standard design methods do not provide sufficient tools for optimisation of the retention process, thus the necessity for development and validation of new tools and methods—such as Computational Fluid Dynamics (CFD) simulations. This paper presents a simplified approach to CFD modelling, by the omission of the discharge phase of the gas system. As the flow field after discharge is stable and driven mainly by the hydrostatic pressure difference, buoyancy and diffusion, this simplified approach appears as an efficient and cost-effective approach. This hypothesis was tested through performing CFD simulations, and their comparison against experimental measurements in a bench scale in a small compartment (0.72 m3), for six mixtures that differ in their density. Modelling the retention of the standard IG55 mixture was very close to the experiment. Modelling of mixtures with a density close to the density of ambient air has proven to be a challenge. However, the obtained results had sufficient accuracy (in most cases relative error <10%). This study shows the viability of the simplified approach in modelling the retention process, and indicates additional benefits of the numerical analyses in the determination of the fire safety of protected premises.

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Stęchły, Katarzyna, Gabriel Wecel et Derek B. Ingham. « CFD modelling of air and oxy-coal combustion ». International Journal of Numerical Methods for Heat & ; Fluid Flow 24, n^o 4 (29 avril 2014) : 825–44. http://dx.doi.org/10.1108/hff-02-2013-0066.

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Purpose – The main goal of this work was the CFD analysis of air and oxy-coal combustion, in order to develop a validated with experimental measurements model of the combustion chamber. Moreover, the purpose of this paper is to provide information about limitations of the sub-models implemented in commercial CFD code ANSYS Fluent version 13.0 for the oxy-coal combustion simulations. The influence of implementation of the weighted sum of gray gas model (WSGGM) with coefficients updated to oxy-coal combustion environment has been investigated. Design/methodology/approach – The sub-models validated with experimental measurements model for the air combustion has been used to predict the oxy-coal combustion case and subsequently the numerical solutions have been compared with the experimental data, which enclose the surface incident radiation (SIR) and the flue gas temperature. To improve the numerical prediction of the oxy-coal combustion process the own routine for calculating properties of the oxy-combustion product has been implemented. Findings – The results of numerical simulation of combustion in the air environment fitted within the experimental measurements accuracy. However, the air combustion sub-models implemented for the oxy-coal combustion simulations does not predict the SIR within the experimental data accuracy. The implementation of own routine, which uses the coefficients calculated for oxy-coal combustion environment shows improvement in numerical prediction of oxy-coal combustion. Originality/value – The radiative properties of gases in the combustion chamber during oxy-coal combustion calculated using the WSGGM implemented in ANSYS Fluent 13.0 do not predict the SIR within experimental measurement accuracy, however, implementation of WSGGM with updated coefficients provide a reasonable improvement in numerical prediction of SIR in the oxy-coal combustion.

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Rampure, Mohan R., Vivek V. Buwa et Vivek V. Ranade. « Modelling of Gas-Liquid/Gas-Liquid-Solid Flows in Bubble Columns : Experiments and CFD Simulations ». Canadian Journal of Chemical Engineering 81, n^o 3-4 (19 mai 2008) : 692–706. http://dx.doi.org/10.1002/cjce.5450810348.

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Vesvikar, Mehul S., et Muthanna Al-Dahhan. « Effect of Scale on Hydrodynamics of Internal Gas-Lift Loop Reactor-Type Anaerobic Digester Using CFD ». Chemical Product and Process Modeling 10, n^o 3 (1 septembre 2015) : 179–92. http://dx.doi.org/10.1515/cppm-2015-0009.

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Abstract This work evaluates the ability of computational fluid dynamics (CFD) to simulate the flow and predict the hydrodynamics of internal gas-lift loop reactor (IGLR)-type anaerobic digester. In addition, it also analyzes if CFD can account for the effects of operating conditions, geometry as well as scale of the reactor. For this purpose, three-dimensional two-phase CFD simulations were performed using CFX for laboratory-scale and pilot-scale IGLR. The CFD predictions were evaluated against experimental data obtained from computer automated radioactive particle tracking (CARPT). The CFD predictions provided good qualitative but only reasonable quantitative comparison. After validation of CFD model, effect of gas flow rate, draft tube diameter, sparger geometry and reactor scale on flow pattern, liquid velocity and dead volume was investigated. Higher gas flow rates did not offer any significant advantage in increasing liquid circulation in the downcomer or decreasing the dead volume. Configuration with draft tube diameter half of tank diameter, equipped with cross sparger showed comparatively better liquid circulation than other configurations. For same superficial gas velocity, increasing the scale increases the magnitude of liquid velocity but fails to match the mixing intensity observed in laboratory scale. Different interphase forces, turbulence models and closures are also evaluated to improve the predictability of CFD models.

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Silva, Marcus Vinicius de Assis, Márcio Aredes Martins, Leda Rita D'Antonino Faroni, Jaime Daniel Bustos Vanegas et Adalberto Hipólito de Sousa. « CFD modelling of diffusive-reactive transport of ozone gas in rice grains ». Biosystems Engineering 179 (mars 2019) : 49–58. http://dx.doi.org/10.1016/j.biosystemseng.2018.12.010.

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Marek, M. « CFD modelling of gas flow through a fixed bed of Raschig rings ». Journal of Physics : Conference Series 530 (22 août 2014) : 012016. http://dx.doi.org/10.1088/1742-6596/530/1/012016.

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Verdin, P. G., C. P. Thompson et L. D. Brown. « CFD modelling of stratified/atomization gas–liquid flow in large diameter pipes ». International Journal of Multiphase Flow 67 (décembre 2014) : 135–43. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2014.07.008.

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Pontiggia, M., M. Derudi, M. Alba, M. Scaioni et R. Rota. « Hazardous gas releases in urban areas : Assessment of consequences through CFD modelling ». Journal of Hazardous Materials 176, n^o 1-3 (15 avril 2010) : 589–96. http://dx.doi.org/10.1016/j.jhazmat.2009.11.070.

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Skřínský, Jan, Jan Koloničný et Tadeáš Ochodek. « Explosion Characteristics of Hydrogen for CFD Modelling and Simulation of Turbulent Gas Flow ». MATEC Web of Conferences 168 (2018) : 07013. http://dx.doi.org/10.1051/matecconf/201816807013.

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Renewable energies became more and more important in the last years. Hydrogen as a promising energy carrier is a perfect candidate to supply the energy demand of the world. The state of the hydrogen gas (turbulences and point concentrations) has a significant impact on the gas explosion indices. A gas cloud is formed by a partial-pressure method in gas explosion experiments in the spherical 20.0∙10-3 m3 chamber. Gas in the chamber reaches an uniform state beyond in hundreds of ms. The absolute pressure for gas dispersion should be higher than 0.01 MPa for the H2 of concentration larger than 30 vol. % of fuel. The initial temperature also influences turbulent gas flow before ignition, especially in the case of the gases lighter-than-air.

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Zhao, Zhijian, Zhiyong Wang, Dan Wang, Jie-Xin Wang, Yuan Pu et Jian-Feng Chen. « CFD modelling of gas flow characteristics for the gas-heating holder in environmental transmission electron microscope ». Canadian Journal of Chemical Engineering 97, n^o 3 (27 avril 2018) : 777–84. http://dx.doi.org/10.1002/cjce.23217.

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Ren, Ting-xiang. « CFD modelling of longwall goaf gas flow to improve gas capture and prevent goaf self-heating ». Journal of Coal Science and Engineering (China) 15, n^o 3 (25 juin 2009) : 225–28. http://dx.doi.org/10.1007/s12404-009-0301-8.

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Schalau, Sebastian, Abdelkarim Habib et Simon Michel. « Atmospheric Wind Field Modelling with OpenFOAM for Near-Ground Gas Dispersion ». Atmosphere 12, n^o 8 (21 juillet 2021) : 933. http://dx.doi.org/10.3390/atmos12080933.

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CFD simulations of near-ground gas dispersion depend significantly on the accuracy of the wind field. When simulating wind fields with conventional RANS turbulence models, the velocity and turbulence profiles specified as inlet boundary conditions change rapidly in the approach flow region. As a result, when hazardous materials are released, the extent of hazardous areas is calculated based on an approach flow that differs significantly from the boundary conditions defined. To solve this problem, a turbulence model with consistent boundary conditions was developed to ensure a horizontally homogeneous approach flow. Instead of the logarithmic vertical velocity profile, a power law is used to overcome the problem that with the logarithmic profile, negative velocities would be calculated for heights within the roughness length. With this, the problem that the distance of the wall-adjacent cell midpoint has to be higher than the roughness length is solved, so that a high grid resolution can be ensured even in the near-ground region which is required to simulate gas dispersion. The evaluation of the developed CFD model using the German guideline VDI 3783/9 and wind tunnel experiments with realistic obstacle configurations showed a good agreement between the calculated and the measured values and the ability to achieve a horizontally homogenous approach flow.

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Mohamad, Barhm, Jalics Karoly et Andrei Zelentsov. « CFD MODELLING OF FORMULA STUDENT CAR INTAKE SYSTEM ». Facta Universitatis, Series : Mechanical Engineering 18, n^o 1 (27 mars 2020) : 153. http://dx.doi.org/10.22190/fume190509032m.

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Formula Student Car (FS) is an international race car design competition for students at universities of applied sciences and technical universities. The winning team is not the one that produces the fastest racing car, but the group that achieves the highest overall score in design, racing performance. The arrangement of internal components for example, predicting aerodynamics of the air intake system is crucial to optimizing car performance as speed changes. The air intake system consists of an inlet nozzle, throttle, restrictor, air box and cylinder suction pipes (runners). The paper deals with the use of CFD numerical simulations during the design and optimization of components. In this research article, two main steps are illustrated to develop carefully the design of the air box and match it with the suction pipe lengths to optimize torque over the entire range of operating speeds. Also the current intake system was assessed acoustically and simulated by means of 1-D gas dynamics using the software AVL-Boost. In this manner, before a new prototype intake manifold is built, the designer can save a substantial amount of time and resources. The results illustrate the improvement of simulation quality using the new models compared to the previous AVL-Boost models.The results illustrate the improvement of simulation quality using the new models compared to the previous AVL-Boost models.

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Reichert, F., et A. Petchanka. « 3D CFD Arc Fault Simulation in Gas-Insulated Switchgears ». PLASMA PHYSICS AND TECHNOLOGY 6, n^o 1 (2019) : 35–38. http://dx.doi.org/10.14311/ppt.2019.1.35.

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Arc fault processes can lead to strong damages in gas-insulated switchgears and have to be considered in the development process. In order to reduce test costs, the development of overpressure protection systems can be supported by CFD arc fault simulations. The paper deals with the modelling and simulation of arc fault processes in gas--insulated switchgears. The developed simulation tool takes into account a three-dimensional arc model and the opening of a rupture disc during the arc fault process. The influence of different insulating media as e.g. SF<sub>6</sub>, Air and CO<sub>2</sub> on the arc fault process has been investigated. The simulation model has been validated by measured signals for pressure build-up and arc voltage.

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Mimouni, Stéphane, Namane Mechitoua et Mehdi Ouraou. « CFD Recombiner Modelling and Validation on the H2-Par and Kali-H2Experiments ». Science and Technology of Nuclear Installations 2011 (2011) : 1–13. http://dx.doi.org/10.1155/2011/574514.

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A large amount of Hydrogen gas is expected to be released within the dry containment of a pressurized water reactor (PWR), shortly after the hypothetical beginning of a severe accident leading to the melting of the core. According to local gas concentrations, the gaseous mixture of hydrogen, air and steam can reach the flammability limit, threatening the containment integrity. In order to prevent mechanical loads resulting from a possible conflagration of the gas mixture, French and German reactor containments are equipped with passive autocatalytic recombiners (PARs) which preventively oxidize hydrogen for concentrations lower than that of the flammability limit. The objective of the paper is to present numerical assessments of the recombiner models implemented in CFD solvers NEPTUNE_CFD and Code_Saturne. Under the EDF/EPRI agreement, CEA has been committed to perform 42 tests of PARs. The experimental program named KALI-H2, consists checking the performance and behaviour of PAR. Unrealistic values for the gas temperature are calculated if the conjugate heat transfer and the wall steam condensation are not taken into account. The combined effects of these models give a good agreement between computational results and experimental data.

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Nosek, Radovan, Jozef Jandacka et Andrzej Szlek. « Boiler Modelling of Simple Combustion Processes ». International Journal of Energy Optimization and Engineering 1, n^o 3 (juillet 2012) : 96–119. http://dx.doi.org/10.4018/ijeoe.2012070105.

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The aim of the work is to investigate coal combustion in fixed bed reactor. The experimental results were worked out in the form of approximation functions describing gas composition at the exit of fixed bed reactor. Furthermore, developed functions were applied for defining the boundary conditions at the interface between the fixed bed and gas phase using FLUENT. The simulations of a domestic boiler have been done and the relative effects of different factors in CFD code were evaluated by sensitivity analysis. The validity of the model was verified by measurements which were done in a 25 kW domestic boiler. Model predictions were compared with the experimental gas temperature and species concentration measurements.

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Rulik, Sebastian, Leszek Remiorz et Sławomir Dykas. « Application of CFD technique for modelling of the thermoacoustic engine ». Archives of Thermodynamics 32, n^o 3 (1 décembre 2011) : 175–90. http://dx.doi.org/10.2478/v10173-011-0021-5.

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Application of CFD technique for modelling of the thermoacoustic engineThe paper is concerned with an important issue from the field of thermoacoustics - the numerical modelling of the flow field in the thermoacoustic engine. The presented way of modelling is based on the solution to fundamental fluid mechanics equations that govern the flow of compressible, viscous, and heat-transferring gas. The paper presents the way of modelling the thermoacoustic engine, the way of conducting calculations and the results which illustrate the correctness of the selected computational technique.

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Sami, Nagham Amer, et Zoltan Turzo. « Computational fluid dynamic (CFD) modelling of transient flow in the intermittent gas lift ». Petroleum Research 5, n^o 2 (juin 2020) : 144–53. http://dx.doi.org/10.1016/j.ptlrs.2020.03.001.

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Tang, Xin, Marcus Kirschen, Markus Abel et Herbert Pfeifer. « Modelling of EAF Off-Gas Post Combustion in Dedusting Systems using CFD Methods ». steel research international 74, n^o 4 (avril 2003) : 201–10. http://dx.doi.org/10.1002/srin.200300182.

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Morud, K. E., et B. H. Hjertager. « LDA measurements and CFD modelling of gas-liquid flow in a stirred vessel ». Chemical Engineering Science 51, n^o 2 (janvier 1996) : 233–49. http://dx.doi.org/10.1016/0009-2509(95)00270-7.

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Ndalila, Petro, Yuxing Li et Cuiwei Liu. « Modelling Flow Behavior of Gas Leakage from Buried Pipelineu ». European Journal of Engineering Research and Science 5, n^o 11 (16 novembre 2020) : 1343–48. http://dx.doi.org/10.24018/ejers.2020.5.11.2117.

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Risks in gas transportation are usually comprised of losses of the valuable gas, fire, explosion, and destruction to the environment. The safety of this infrastructure especially flammable gas pipelines is of great importance due to potential associated risks when leakage happens. An accurate understanding of the dispersion characteristics of the leaked gas from the underground pipe is of great importance. A gas leaking model from the buried pipeline was established based on computational fluid dynamics (CFD) technique, to simulate the situation. At the incidence of leakage, gas will propagate out and cause changes in flow behavior, which will prompt the detectors. The leakage position influences significantly much on the strength of leak signals to be detected at the ground surface. Under the simulation process, the double leakage pipeline model was involved. The variation of flow parameters inside the pipeline, outside pipeline, and the effect of leakage position were depicted and analyzed.

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Scargiali, Francesca, Antonio Busciglio, Andrea Cipollina, Franco Grisafi, Giorgio Micale, Alessandro Tamburini, Giuseppa Vella et Alberto Brucato. « Modelling and Simulation of Gas–liquid Hydrodynamics in a Rectangular Air-lift Reactor ». International Journal of Chemical Reactor Engineering 11, n^o 2 (3 juillet 2013) : 667–74. http://dx.doi.org/10.1515/ijcre-2012-0040.

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Abstract Computational Fluid Dynamics is a quite well established tool for carrying out realistic simulations of process apparatuses. However, as a difference from single phase systems, for multiphase systems the development of CFD models is still in progress. Among the two-phase systems, gas–liquid systems are characterised by an additional complexity level, related to the fact that bubble sizes are not known in advance, being rather the result of formation and breakage-coalescence dynamics and therefore of complex phenomena related to flow dynamics and interfacial effects. In the present work, Euler–Euler Reynolds-averaged flow simulations of an air-lift reactor are reported. All bubbles are assumed to share the same size, and a simplified approach is adopted for modelling inter-phase momentum exchange, that involves bubble terminal velocity as the sole parameter needed. Good agreement between simulation results and literature experimental data is found for all the gas flow rates simulated. This result implies that, despite the many simplifications that have to be adopted in order to make them viable, fully predictive CFD simulations of gas–liquid systems can give rise to reasonably accurate predictions of reactor fluid dynamics.

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Pantousa, Daphne, et Euripidis Mistakidis. « Interface modelling between CFD and FEM analysis : the dual-layer post-processing model ». Engineering Computations 34, n^o 4 (12 juin 2017) : 1166–90. http://dx.doi.org/10.1108/ec-06-2015-0146.

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Purpose The primary purpose of this paper is the development of a fire–structure interface (FSI) model, which is referred in this study as a simplified “dual-layer” model. It is oriented for design purposes, in the cases where fire-compartments exceed the “regular” dimensions, as they are defined by the guidelines of the codes (EN 1991-1-2). Design/methodology/approach The model can be used at the post-processing stage of computational fluid dynamics (CFD) analysis and it is based on the gas-temperature field (spatial and temporal) of the fire-compartment. To use the “dual-layer” model, first the gas-temperature (discrete) function along the height of the fire-compartment, at discrete plan–view points should be determined through the output of the CFD analysis. The model “compresses” the point data to (spatial) virtual zones, which are divided into two layers (with respect to the height of the fire-compartment) of uniform temperature: the upper (hot) layer and the lower (cold) layer. Findings The model calculates the temporal evolution of the gas-temperature in the fire compartment in every virtual zone which is divided in two layers (hot and cold layer). Originality/value The main advantage of this methodology is that actually only three different variables (height of interface upper-layer temperature and lower-layer temperature) are exported during the post-processing stage of the CFD analysis, for every virtual zone. Next, the gas-temperature can be used for the determination of the temperature profile of structural members using simple models that are proposed in EN 1993-1-2.

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Haddadi Sisakht, Bahram, Christian Jordan, Philipp Schretter, Tino Lassmann et Michael Harasek. « Designing Better Membrane Modules Using CFD ». Chemical Product and Process Modeling 11, n^o 1 (1 mars 2016) : 57–66. http://dx.doi.org/10.1515/cppm-2015-0066.

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Abstract In the last decades, a large number of studies have been carried out on the utilization of membranes in separation processes. However, most of these studies deal with material properties, experimental investigations and process modeling. Only quite a few authors utilized computational fluid dynamics (CFD) to analyze the flow and mass transfer in membrane modules. Using CFD it is possible to obtain spatially resolved information on the behavior of membrane modules, allowing for the investigation of geometric effects on the performance of the module. This includes e. g. the positioning of the permeate outlets, the flow alignment (co- and/or counter-current), the use of spacers and other mixing promoters and also the subject of concentration polarization close to the membrane surface. In our present study we made use of OpenFOAM®, which is a free open sourced CFD toolbox. The toolbox enables for introducing new solver code, membraneFoam, based on the standard multicomponent solver reactingFoam. In membraneFoam suitable source and sink terms have been added to account for trans-membrane flux – in this case based on the solution-diffusion model for glassy polymer gas permeation membranes. The solver has been preliminary validated using literature data obtained from a process simulation code. In a first stage of the research work the positioning of the permeate outlet and the flow alignment have been investigated for a hollow fiber gas permeation module. By adjusting the position of the permeate outlet the shell side flow can be co-current, counter-current or mixed type relative to the retentate flow inside the fibers. Since this influences the driving force for the trans-membrane flux, effects on the module performance are expected which have been analyzed using the described membraneFoam CFD approach.

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Spicka, Peter, Madalena M. Dias et Jose’e Carlos B. Lopes. « Gas–liquid flow in a 2D column : Comparison between experimental data and CFD modelling ». Chemical Engineering Science 56, n^o 21-22 (novembre 2001) : 6367–83. http://dx.doi.org/10.1016/s0009-2509(01)00276-7.

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