Strawberries are packed using a multi-packaging system, with clamshells serving as the primary packaging and placed inside a tray, acting as the secondary packaging. The maintenance of uniform and desired convective heat transfer coefficients (CHTCs) at various walls of clamshells containing strawberries, as well as at different positions inside th...
En juillet 2023, une grande campagne expérimentale de recherche (PANAME2023), a eu lieu pour étudier la météorologie de l'agglomération parisienne, en particulier l'îlot de chaleur urbain. Cette campagne, regroupant plusieurs laboratoires de recherches, est copilotée par le Centre National de Recherches Météorologiques (CNRM). Ceci permettra à term...
L’objectif de ce travail de thèse est d’obtenir une modulation temporelle des propriétés d’un cristal phononique (CP) piézoélectrique afin de contrôler la propagation de modes guidés de type Lamb. Ceci nécessite dans un premier temps de développer un dispositif expérimental permettant une agilité dans la gestion des conditions aux limites électriqu...
Face au contexte de tension sur le réseau électrique provoquée par la demande de pointe et de la transition énergétique et écologique où le bâtiment est au coeur des considérations, il est plus que nécessaire d’implémenter une gestion plus appropriée de la consommation qui permette de réduire les bilans environnementaux, et économiques des bâtiment...
Extremely high urban temperatures adversely affect photovoltaic (PV) system performance. Accurate PV cell temperature assessment relies on local weather conditions, exacerbated by urban overheating, often overlooked by inadequate temperature models and non-local data. This study investigates the electrical and thermal PV performance, considering mo...
This paper investigates the behavior of a Thermal Energy Storage (TES) under periodic boundary conditions. An analytical model is adapted to the studied case and solved for a 2D configuration using a commercial computational fluid dynamics (CFD) software. It permits to find the temperatures and the velocities in the medium and to track the solid/li...
Although a superconductor has no DC losses, a superconducting system does have significant losses, not least due to its power supply. Here, we study two different power supply systems. The first, a conventional one, consists of a transformer and a diode bridge operating at room temperature, plus current leads that allow the current to flow from the...
The study aims to provide information on the spray characteristics and vaporization process of ammonia-ethanol blends with a current GDI injector at different air densities and temperatures. The Schlieren technique was used to capture images of liquid spray. The penetration length and the spray angle at quarter-penetration length were measured and ...
We present here a new planar calorimeter coupling dielectric spectroscopy and DSC measurements permitting to link dielectric and thermodynamic behaviors. It is especially suited for sintered ferroelectric pellets or electroactive polymers with transition temperatures from 10 to 140°C and could be applied to thin films with high sensitivity. To show...
This paper presents a novel approach for extrapolating DEM simulations of heat transfer over a long period of time. This method is an extension of a previously published algorithm for granular motion extrapolation, introducing heat transfer. The main idea is to perform a short-term DEM simulation for one period and then apply a conductive heat tran...
