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Affichage de 731 à 740 sur 6556

Article dans une revue

Fabrication and characterization of PU/NKLNT/CFs based lead-free piezoelectric composite for energy harvesting application

Zakia Chelli, Hakim Hachour, Malika Saidi, Mourad Laghrouche, Ahcène Chaouchi, Mohamed Rguiti, Yannick Lorgouilloux, Christian Courtois

For vibration energy harvesting applications, a flexible composite material based on a polyurethane (PU) polymer matrix filled with polycrystalline particles (Na0.535K0.48)0.966 Li0.058 Nb0.9Ta0.1O3 (NKLNT) and crushed carbon fibers (CFs) has been developed by tape-casting method. NKLNT was...

Polymer-Plastics Technology and Materials, 2021, 60 (12), pp.1344-1356. ⟨10.1080/25740881.2021.1888995⟩. ⟨hal-03480434⟩

Communication dans un congrès

Numerical Investigating of Oscillatory Flow and Heat Transfer Through Stirling Regenerator

Houda Hachem, Ramla Gheith, Fethi Aloui

Abstract By developing our proper CFD code under Fortran, the performances of a Stirling engine are studied in unsteady laminar regime and closely linked to the properties of its regenerator. However, it is responsible about the maximum part of losses in the Stirling engine. These losses depend on...

ASME 2021 Fluids Engineering Division Summer Meeting, Aug 2021, Virtual Event, France. ⟨10.1115/FEDSM2021-65624⟩. ⟨hal-03536923⟩

Communication dans un congrès

Transient Rayleigh-Bénard Thermal Convection With Radiation Heat Transfer in Participating Media Using the Control Volume Finite Element Method (CVFEM) and Lattice Boltzmann Method

Raoudha Chaabane, Abdelmajid Jemni, Fethi Aloui

In this paper, a gas-kinetic Bhatnagar-Gross-Krook (BGK) model is constructed for the Rayleigh-Benard thermal convection transfer in a two-dimensional cavity containing an absorbing, emitting, and scattering medium, where the flow field and temperature field are described by two coupled Lattice...

ASME 2021 Fluids Engineering Division Summer Meeting, Aug 2021, Virtual Event, France. ⟨10.1115/FEDSM2021-65629⟩. ⟨hal-03536801⟩

Communication dans un congrès

Elementary Numerical Analysis of Wet Foam Formation and Study of Its Flow Structures and Physical Behavior

Ebrahim Shirani, Sima Nasirzade, Fethi Aloui

Abstract The purpose of this study is to analyze the flow of wet foam and to study the effect of volume fraction, velocity and surface tension and other physical parameters on the foam flow. The most numerical researches done in this area are for single-phase flows. The numerical simulation in this...

ASME 2021 Fluids Engineering Division Summer Meeting, Aug 2021, Virtual Event, France. ⟨10.1115/FEDSM2021-65627⟩. ⟨hal-03536949⟩

Communication dans un congrès

Experimental Investigations on the Effect of a Wavy Surface on Hydrodynamic Instabilities in a Taylor-Couette System

Lamia Gaied, Emna Berrich, Marc Lippert, Laurent Keirsbulck, Fethi Aloui

Abstract In this work, we propose an experimental study of the effect of surface roughness of the internal cylinder Couette-Taylor system in order to investigate the hydrodynamic instabilities of the flow. During experiments, the inner cylinder, which presents a rough surface with u cylinder...

ASME 2021 Fluids Engineering Division Summer Meeting, Aug 2021, Virtual Event, France. ⟨10.1115/FEDSM2021-65631⟩. ⟨hal-03536856⟩

Communication dans un congrès

Structural Analysis of Couette-Taylor Flow With Periodic Oscillation of the Inner Cylinder in Different Flow Regimes

Shima Mahmoudirad, Ebrahim Shirani, Fethi Aloui

Abstract The structures of flow in laminar Couette-Taylor flow with periodic oscillation of the inner cylinder rotation velocity (which linearly increases from zero to a fixed maximum value and then goes to zero again in each period) for different three regimes; Couette flow, Taylor vortex and wavy...

ASME 2021 Fluids Engineering Division Summer Meeting, Aug 2021, Virtual Event, France. ⟨10.1115/FEDSM2021-65626⟩. ⟨hal-03536893⟩

Article dans une revue

Robust Estimation for Nonlinear Continuous-Discrete Systems With Missing Outputs: Application to Automatic Train Control

Thierry-Marie Guerra, Braulio Norberto Aguiar Cota, Denis Berdjag, Bernard Demaya

This brief is about robust estimation for a sampled output system with continuous dynamics using unknown input observers (UIOs). A novel worst case estimation error bound is developed using a particular form of Gronwall inequality. The motivation is to assess the accuracy of the estimator in real-...

IEEE Transactions on Control Systems Technology, 2021, pp.1-7. ⟨10.1109/TCST.2021.3101737⟩. ⟨hal-03426303⟩

Article dans une revue

Stochastic home health care routing and scheduling problem with multiple synchronized services

Mohammed Bazirha, Abdeslam Kadrani, Rachid Benmansour

The home health care (HHC) covers a wide range of health care services carried out in patients’ home in case of illness, injury or aging. Each caregiver should as far as possible adhere to the schedule set by the decision maker. However, unforeseen events would sometimes occur and delay the...

Annals of Operations Research, 2021, ⟨10.1007/s10479-021-04222-w⟩. ⟨hal-03716481⟩

Communication dans un congrès

Availability analysis of a two-component parallel system under stochastic dependence

Ziyad Bahou, Nizar Elhachemi, Issam Krimi, Abdessamad Ait El Cadi, Najiba Sbihi

Research in maintenance engineering is increasingly focusing on complex systems in which components are subject to various dependencies, such as stochastic, structural, and economic dependences. This paper proposes a mathematical approach to calculate system’s availability with stochastic...

4th European International Conference on Industrial Engineering and Operations Management, IEOM 2021, Aug 2021, Rome, Italy. pp.1644 - 1653. ⟨hal-03710662⟩

Article dans une revue

Modeling and Prediction of the Dynamic Viscosity of Nanofluids by a Homogenization Method

Ibrahim Zaaroura, Hilal Reda, Fabrice Lefebvre, Julien Carlier, Malika Toubal, Souad Harmand, Bertrand Nongaillard, Hassan Lakiss

Nanofluids are an innovative technology that can be used to improve the efficiency of heat transfer in systems such as coolers. Thermal system design requires access to all the physical properties of the nanofluids among which viscosity, thermal conductivity, and so on. Viscosity is an important...

Brazilian Journal of Physics, 2021, 51 (4), pp.1136-1144. ⟨10.1007/s13538-021-00909-4⟩. ⟨hal-03446033⟩