https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Tue, 21 Apr 2026 13:45:52 GMT 2026-04-21T13:45:52Z http://hdl.handle.net/10985/15336 Modeling dynamic systems : contribution to the unsteady behavior of a condenser based on the pseudo-bond graph approach KEBDANI, Mohamed; DAUPHIN-TANGUY, Geneviève; DAZIN, Antoine This article is devoted to the dynamic study of the brazed plate condenser (BPC). The proposed model is based on the bond graph theory. The proposed model is based on the bond graph theory because of its energetic approach and multi-physics character of the studied system. The model is discretized into five control volumes. The resolution of mass and energy equations is done by Runge-Kutta method embedded in 20sim software. Analyses of simulation results show that the model has a good ability to transcribe the time evolution of the temperature and pressure in both regimes, transitional and permanent. Also, the model is experimentally validated without any fitting of the set of thermal exchange coefficients. Mon, 01 Jan 2018 00:00:00 GMT http://hdl.handle.net/10985/15336 2018-01-01T00:00:00Z KEBDANI, Mohamed DAUPHIN-TANGUY, Geneviève DAZIN, Antoine This article is devoted to the dynamic study of the brazed plate condenser (BPC). The proposed model is based on the bond graph theory. The proposed model is based on the bond graph theory because of its energetic approach and multi-physics character of the studied system. The model is discretized into five control volumes. The resolution of mass and energy equations is done by Runge-Kutta method embedded in 20sim software. Analyses of simulation results show that the model has a good ability to transcribe the time evolution of the temperature and pressure in both regimes, transitional and permanent. Also, the model is experimentally validated without any fitting of the set of thermal exchange coefficients. http://hdl.handle.net/10985/15379 Experimental development and bond graph dynamic modelling of a brazed plate heat exchanger KEBDANI, Mohamed; DAUPHIN-TANGUY, Geneviève; DUPONT, Patrick; DAZIN, Antoine This article is devoted to the dynamic study of a brazed plate heat exchanger (BPHE). First, an introduction to the industrial context of the current FUI THERMOFLUIDE project is proposed. A succinct presentation of the heat exchanger technology is proposed. Afterward, a state of the art discussion of BPHE modelling, heat transfer and pressure drop correlations is given. Then a detailed mathematical description of an original dynamic model is presented. The last section deals with a description of the experimental test rig and performed validation tests. Sun, 01 Jan 2017 00:00:00 GMT http://hdl.handle.net/10985/15379 2017-01-01T00:00:00Z KEBDANI, Mohamed DAUPHIN-TANGUY, Geneviève DUPONT, Patrick DAZIN, Antoine This article is devoted to the dynamic study of a brazed plate heat exchanger (BPHE). First, an introduction to the industrial context of the current FUI THERMOFLUIDE project is proposed. A succinct presentation of the heat exchanger technology is proposed. Afterward, a state of the art discussion of BPHE modelling, heat transfer and pressure drop correlations is given. Then a detailed mathematical description of an original dynamic model is presented. The last section deals with a description of the experimental test rig and performed validation tests. http://hdl.handle.net/10985/20316 Development of a Model Based on Physical Mechanisms for the Explanation of Drug Release: Application to Diclofenac Release from Polyurethane Films ABBASNEZHAD, Navideh; KEBDANI, Mohamed; SHIRINBAYAN, Mohammadali; CHAMPMARTIN, Stephane; TCHARKHTCHI, Abbas; KOUIDRI, SMAINE; BAKIR, Farid In this study, we present a method for prediction of the drug-release profile based on the physical mechanisms that can intervene in drug release from a drug-carrier. The application presented here incorporates the effects of drug concentration and Reynolds number defining the circulating flow in the testing vein. The experimental data used relate to the release of diclofenac from samples of non-degradable polyurethane subjected to static and continuous flow. This case includes simultaneously three mechanisms: burst-release, diffusion and osmotic pressure, identified beforehand here as being able to contribute to the drug liberation. For this purpose, authors coded the Sequential Quadratic Programming Algorithm to solve the problem of non-linear optimization. The experimental data used to develop the mathematical model obtained from release studies carried out in water solution at 37 °C, for three concentrations of diclofenac and two water flow rates. We discuss the contribution of mechanisms and kinetics by considering two aforementioned parameters and, following that, we obtain the specific-model and compare the calculated results with the experimental results for the reserved cases. The results showed that drug percentage mostly affect the burst release, however flow rate has affected the osmotic release. In addition, release kinetics of all the mechanisms have increased by increasing the values of two considered parameters. Fri, 01 Jan 2021 00:00:00 GMT http://hdl.handle.net/10985/20316 2021-01-01T00:00:00Z ABBASNEZHAD, Navideh KEBDANI, Mohamed SHIRINBAYAN, Mohammadali CHAMPMARTIN, Stephane TCHARKHTCHI, Abbas KOUIDRI, SMAINE BAKIR, Farid In this study, we present a method for prediction of the drug-release profile based on the physical mechanisms that can intervene in drug release from a drug-carrier. The application presented here incorporates the effects of drug concentration and Reynolds number defining the circulating flow in the testing vein. The experimental data used relate to the release of diclofenac from samples of non-degradable polyurethane subjected to static and continuous flow. This case includes simultaneously three mechanisms: burst-release, diffusion and osmotic pressure, identified beforehand here as being able to contribute to the drug liberation. For this purpose, authors coded the Sequential Quadratic Programming Algorithm to solve the problem of non-linear optimization. The experimental data used to develop the mathematical model obtained from release studies carried out in water solution at 37 °C, for three concentrations of diclofenac and two water flow rates. We discuss the contribution of mechanisms and kinetics by considering two aforementioned parameters and, following that, we obtain the specific-model and compare the calculated results with the experimental results for the reserved cases. The results showed that drug percentage mostly affect the burst release, however flow rate has affected the osmotic release. In addition, release kinetics of all the mechanisms have increased by increasing the values of two considered parameters. http://hdl.handle.net/10985/24042 Numerical Analysis of Distance Effect between Inducer and Centrifugal Impeller in Independent Rotational Turbopump in Co-rotating and Counter-rotating Mode DEHNAVI, Ehsan; BAKIR, Farid; DANLOS, Amélie; KEBDANI, Mohamed This study focuses on enhancing the performance of turbomachines through the design of multi rotor configurations. Specifically, the effect of the distance between an axial inducer and a centrifugal impeller, which rotates independently in both co-rotation and counter-rotation modes, is investigated in a turbopump. The study parameters include the speed ratio and the distance between the inducer and impeller. Numerical results for the centrifugal impeller are validated through experimental testing, and two inducers with the same geometrical characteristics but with inverse tip angles are designed. Results show that changing the distance between the inducer and impeller, as well as the speed ratio, can have a significant impact on the turbomachine's performance. Sat, 01 Apr 2023 00:00:00 GMT http://hdl.handle.net/10985/24042 2023-04-01T00:00:00Z DEHNAVI, Ehsan BAKIR, Farid DANLOS, Amélie KEBDANI, Mohamed This study focuses on enhancing the performance of turbomachines through the design of multi rotor configurations. Specifically, the effect of the distance between an axial inducer and a centrifugal impeller, which rotates independently in both co-rotation and counter-rotation modes, is investigated in a turbopump. The study parameters include the speed ratio and the distance between the inducer and impeller. Numerical results for the centrifugal impeller are validated through experimental testing, and two inducers with the same geometrical characteristics but with inverse tip angles are designed. Results show that changing the distance between the inducer and impeller, as well as the speed ratio, can have a significant impact on the turbomachine's performance. http://hdl.handle.net/10985/22475 Design and off-design system simulation of concentrated solar super-critical CO2 cycle integrating a radial turbine meanline model HUEBEL, Moritz; DJANAME, Tchable-Nan; SPECKLIN, Mathieu; KEBDANI, Mohamed; RAVELET, Florent; DELIGANT, Michael The proper design of a Concentrated solar power (CSP) plant and the associated thermal energy storage requires a careful analysis of the yearly expected irradiance and environmental conditions. System simulations based on accurate components models allow the prediction of the performance of the plant and the analysis of the components interactions. The simulations of various scenarios provide information that will help tuning the design of the components to improve the performance of the whole system at design and off-design conditions. In this paper, the focus is set on the radial turbine expander which is one of the most important component. Classical system simulation approaches use map based performance model for the turbine. This require to generate the performance map either with meanline models, CFD simulations or experiments. This is not very convenient when iterating on the system design and if the actual turbine does not exist yet. In this work, a meanline model for radial inflow turbine operating with real gas has been implemented in MODELICA language for the first time to the authors’ best knowledge. This turbine model has been coupled with the available CSP sCO2 Brayton cycle model in MODELON ThermalPower library. A parametric study on a virtual test bench show the turbine performances for various rotational speed and inlet guide vane angle. The study focus then on the performance prediction of on and off design of the system with a 8 MW turbine obtained with a simple preliminary design calculation. The investigations showed that for the varying load conditions in the solar plant system, an improved operating point has been identified by adjusting the rotational speed and the inlet guide vane angle. Future work will focus on the use such system model with multi objective meta heuristic optimization. déjà sur hal Tue, 01 Nov 2022 00:00:00 GMT http://hdl.handle.net/10985/22475 2022-11-01T00:00:00Z HUEBEL, Moritz DJANAME, Tchable-Nan SPECKLIN, Mathieu KEBDANI, Mohamed RAVELET, Florent DELIGANT, Michael The proper design of a Concentrated solar power (CSP) plant and the associated thermal energy storage requires a careful analysis of the yearly expected irradiance and environmental conditions. System simulations based on accurate components models allow the prediction of the performance of the plant and the analysis of the components interactions. The simulations of various scenarios provide information that will help tuning the design of the components to improve the performance of the whole system at design and off-design conditions. In this paper, the focus is set on the radial turbine expander which is one of the most important component. Classical system simulation approaches use map based performance model for the turbine. This require to generate the performance map either with meanline models, CFD simulations or experiments. This is not very convenient when iterating on the system design and if the actual turbine does not exist yet. In this work, a meanline model for radial inflow turbine operating with real gas has been implemented in MODELICA language for the first time to the authors’ best knowledge. This turbine model has been coupled with the available CSP sCO2 Brayton cycle model in MODELON ThermalPower library. A parametric study on a virtual test bench show the turbine performances for various rotational speed and inlet guide vane angle. The study focus then on the performance prediction of on and off design of the system with a 8 MW turbine obtained with a simple preliminary design calculation. The investigations showed that for the varying load conditions in the solar plant system, an improved operating point has been identified by adjusting the rotational speed and the inlet guide vane angle. Future work will focus on the use such system model with multi objective meta heuristic optimization.