Article
Thermodynamics
T. Thangaraj, T. Jana, M. Kaushik, T. Subramanian
Summary: This study investigates shock structures of circular, elliptic, and square jets at various sonic underexpansion levels, finding distinct differences in shock development and flow patterns between elliptic, square, and circular jets.
JOURNAL OF APPLIED FLUID MECHANICS
(2022)
Article
Nuclear Science & Technology
Soumya Sarkar, Nirvik Sen, K. K. Singh
Summary: This study aims to investigate bubble formation at top-submerged nozzles of different diameters. The effects of air flow rate, nozzle diameter, and the liquid used on bubble diameter and bubble detachment time are quantified using high-speed imaging. Previously reported correlations to estimate the diameter of bubbles formed at top-submerged nozzles are compared with the data generated in the present study and found to be inadequate. Hence, a new correlation using relevant dimensionless numbers (Bond number, Froude number, and Galileo number) is regressed utilizing the experimental data.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Engineering, Chemical
J. Girardot, J. B. Kopp, B. Croquelois, P. Tchoreloff, S. Morel, V. Mazel
Summary: Pharmaceutical tablets need to have sufficient mechanical strength, which is often evaluated using the diametral compression test. However, this test can lead to unstable failures. By applying load-unload cycles to tablets during the diametral compression test, it was found that the concept of equivalent linear elastic fracture mechanics can be successfully applied to Mode I fracture behavior. This revealed the development of a Fracture Process Zone (FPZ), indicative of a quasi-brittle behavior, and the existence of a second dissipative mechanism caused by friction in the FPZ during cyclic loading.
Article
Energy & Fuels
Andreas Koenig-Haagen, Erwin Franquet, Moritz Faden, Dieter Brueggemann
Summary: This study compares the performance of fixed grid methods in solid/liquid phase transition modeling and simulation, finding that most solvers give similar results when stable, but still show significant deviations from experiments, with poor resilience observed in the case of the apparent heat capacity method.
Article
Thermodynamics
Sylvain Serra, Erwin Franquet, Valentin Boutrouche, Remi Manceau
Summary: The phenomenon of laminarization of a turbulent flow due to wall heating has been studied for over 50 years, with recent success in using some Reynolds-averaged Navier-Stokes models to describe the influence of a strong transverse temperature gradient on turbulent flows. Different turbulence models were utilized to analyze reverse transition, with over 800 calculations performed to open room for debate on the possibility for such approaches to correctly reproduce the experimentally observed behavior.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Construction & Building Technology
M'hand Dehmous, Erwin Franquet, Nacer Lamrous
Summary: In this study, a thermal energy storage concrete (TESC) was developed by incorporating composite lightweight aggregates (cLWA) with a bio-based phase change material (PCM). Different impregnation methods and mineral lightweight aggregates were used, and the materials were comprehensively characterized using various analytical methods.
ENERGY AND BUILDINGS
(2021)
Article
Thermodynamics
Clement Beust, Erwin Franquet, Jean-Pierre Bedecarrats, Pierre Garcia
Summary: The study discusses the importance of thermal energy storage in the pursuit of a sustainable economy and the key issues involved, mainly focusing on the fundamental effects of liquid-phase transitions. The research emphasizes the importance of properly defining the temperature range of the phase change in simulations and provides some suggestions for parameter selection and handling.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Timothe Gronier, Jaume Fito, Erwin Franquet, Stephane Gibout, Julien Ramousse
Summary: The study introduces an iterative sizing method focusing on demand-side management to optimize the overall performance of district energy networks integrating solar sources. Various criteria, including energetic, economical, and operational aspects, are considered, with exergy playing a key role in evaluating the quality of energy in multi-energy networks. The method effectively reduces the number of installed solar thermal collectors and photovoltaic panels while ensuring stable results after just two iterations in all scenarios.
Article
Energy & Fuels
Mukesh Kumar, Didier Haillot, Stephane Gibout
Summary: Greenhouse cultivation is a modern form of agriculture that aims to achieve higher yields and better crop quality through controlled environments. This study evaluates the potential of PV, STC, and PV/T solar technologies in greenhouses. PV modules show promise in meeting electrical energy demand, but shading effects can reduce photosynthetic efficiency. Dynamic shading and concentrating solar technologies offer potential solutions. Semi-transparent PV technologies and STC collectors can also be integrated into greenhouses. Overall, implementing solar technologies in greenhouses can enhance crop production and ensure sustainable energy production.
Article
Chemistry, Multidisciplinary
Maxime Thonon, Laurent Zalewski, Stephane Gibout, Erwin Franquet, Gilles Fraisse, Mickael Pailha
Summary: This study compares three characterization methods for phase change materials (PCM) and finds no significant difference in latent heat and total energy exchanged. However, the calorimeter-DSC and STEP methods were not accurate in characterizing the supercooling process of PEG6000 observed with the FM method. RT58 and PEG6000 have equivalent energy density, but PEG6000 stores more energy within the same volume due to its higher mass density.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Didier Haillot, Yasmine Lalau, Erwin Franquet, Sacha Rigal, Frederic Jay, Jean-Pierre Bedecarrats
Summary: This study focuses on the development of thermal energy storage systems in the low-temperature range, with a particular emphasis on phase change materials selection, encapsulation, and performance testing. A numerical model validated by experimental results is used to explore the impact of operating conditions, dimension choices, and material conductivity improvements.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Timothe Gronier, William Marechal, Stephane Gibout, Christophe Geissler
Summary: Hydrogen is considered a promising vector for energy storage, particularly in heavy mobility applications. This paper examines the relevance of hydrogen in two storage applications and uses optimization methods to evaluate their performance. The study finds that hydrogen is not competitive with electrochemical storage in domestic power-to-power applications, but is more relevant and cost-effective in power-to-gas applications for mobility.
Article
Energy & Fuels
Timothe Gronier, William Marechal, Christophe Geissler, Stephane Gibout
Summary: With the growing constraints on energy and resource markets and the continuous increase in energy demand, the demand for clean energy generation and storage solutions is rising, even at the individual home level. However, small-scale energy storage is still an expensive investment in 2022, and the risk/reward ratio is not attractive enough for individual homeowners. One alternative is for homeowners to collectively produce hydrogen instead of individually storing excess clean energy.
Article
Energy & Fuels
J. Reveillon, E. Franquet, C. Langree, G. Lecocq, B. Duret, F. X. Demoulin
Summary: The objective of this study is to investigate the propagation of a premixed flame through obstacles and the interactions between flame and obstacles. Different premixed flame models were evaluated using OpenFoam, all of which are based on progress variable evolution and consider the increase in flame speed due to turbulence effects.
Article
Thermodynamics
Edwin S. Pinto, Timothe Gronier, Erwin Franquet, Luis M. Serra
Summary: In the current energy transition towards carbon neutrality, the residential sector has a crucial role in combating climate change due to its significant contribution to global final energy consumption and direct CO2 emissions in the European Union. Polygeneration systems, which integrate renewable energies, offer an environmentally friendly and efficient use of natural resources. This study examines the economic viability and environmental benefits of an energy supplier company that acts as an aggregator for both demand and supply, owning a polygeneration system optimized through a MILP approach. Results show that the proposed configuration, including cogeneration, PV, heat pump, boiler, and thermal energy storage, is resilient and cost-effective, providing value for both the supplier company and final customers with reduced CO2 eq emissions.
Article
Energy & Fuels
Timothe Gronier, Erwin Franquet, Stephane Gibout
Summary: This paper presents the PEACEFULNESS software platform, an open framework dedicated to multi-energy smart-grids. It integrates economic considerations and aims to evaluate energy management strategies and policies. The platform focuses on maximizing renewable energy use and implementing demand side management techniques in a shared economy context. It offers a unique feature of extending DSM techniques to various energy grids and allows simulation of operations and supervision of thousands of agents.