Daniel Tondeur

Bio: Daniel Tondeur is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topic(s): Pressure swing adsorption & Adsorption. The author has an hindex of 28, co-authored 104 publication(s) receiving 2510 citation(s). Previous affiliations of Daniel Tondeur include Nancy-Université & Elf Aquitaine.

Equipartition of entropy production. An optimality criterion for transfer and separation processes

Abstract: Dans un dispositif de contact ou de separation comprenant une aire de transfert donnee et effectuant un transfert specifie, l'entropie totale produite est minimale lorsque la vitesse locale de production d'entropie est uniformement repartie (equiseparee) le long des variables spatiales et/ou temporelles. Cette propriete est demontree pour les conditions de thermodynamique de non-equilibre classique: relations lineaires flux-force et relations de reciprocite d'Onsager. On montre que les procedes «equisepares» sont optimaux au sens economique, c'est-a-dire qu'ils correspondent au minimum de quelque fonction de cout

Adsorption, science and technology

Abstract: I. Characterization of Adsorbents and Tthermodynamics of Adsorption.- Characterization of adsorbents.- Theories of adsorption in micropores.- The statistical thermodynamic approach to the correlation of equilibrium data.- A two-patch heterogeneous model with surface phase transition for benzene adsorption on silicalite.- Interpretation of low temperature gas adsorption and desorption using stochastic pore networks.- Adsorption of n-hexane and 3-methylpentane on zeolites Y and ZSM 20.- II. Kinetics of Adsorption and Fixed-Bed Processes.- Adsorption kinetics.- Dynamics of fixed-bed adsorbers. Isothermal adsorption of single components.- Asymptotic fixed-bed behavior: proportionate and constant patterns.- Pore scale hydrodynamics.- Separation processes based on electrosorption phenomena.- Adsorptive reactors.- Design aspects of fixed-bed adsorption processes.- Numerical methods for the solution of adsorption models.- III. Cyclic Processes and Simulated Moving Beds.- Gas separation by pressure swing adsorption using carbon molecular sieves.- Pressure swing adsorption technology.- Modeling and simulation of rate induced PSA separations.- Thermal swing adsorption.- On countercurrent adsorption separation processes.- Sorbex: continuing innovation in liquid phase adsorption.- IV. Applications in Biotechnology and Environmental Engineering.- The use of granular activated carbon for potable water treatment as an example of liquid phase applications of activated carbon.- Breakthrough time of organic vapours in activated carbon filters as a function of the air flow pattern.- Continuous adsorption in biotechnology.- Continuous chromatographic processes.- Biochemical reaction and separation in chromatographic columns.- Some factors involved in scale-up of industrial biotechnological adsorption processes.- Development of physical and mathematical modelling for scale-up of batch stirred tank and packed-bed column adsorption and chromatographic units.- Optimisation of adsorption techniques for the purification of biomolecules.- Gel filtration chromatography.- Adsorption chromatography for protein purification.- List of Lecturers and Participants.

Design and scaling laws of ramified fluid distributors by the constructal approach

Abstract: The present paper contributes to theoretical advances in the conception, modelling and design of multi-scale fluidic elements, namely fluid distributors. The function of such fluid distributors is to deliver a controlled amount or rate of fluid to an array of distributing ports, in order for example to feed uniformly the channels of a multi-tubular heat exchanger, or of a catalytic monolith, or any other fluid-handling engineering apparatus. In recent years, distributors based on multi-scale channel networks, of fractal tree type, have been developed. The theoretical approach presented allows to design such distributors optimally, within certain constraints. The basis of the optimization is a compromise between “costs” related to pressure drop and viscous dissipation on one hand, and hold-up volume of the pore structure on the other hand. The calculations lead to geometric scaling laws, that is to relations between the dimensions of the channels at the different scales. Scaling relations are also established for different characteristic quantities, such as pressure drop, viscous dissipation power, volume fractions, wall surfaces, cost functions. An example of design procedure is given, and examples of distributors fabricated by stereolithography is shown.

Dynamics of natural gas adsorption storage systems employing activated carbon

Abstract: Various aspects of the dynamics of natural gas adsorption storage systems employing activated carbon are studied theoretically. The fast charge of the storage system is the first subject addressed. Emphasis is given to thermal effects and hydrodynamics of flow through the carbon bed. In order to study the influence of diffusional resistances on charge dynamics, an intraparticle transport equation governed by a diffusion law is added to the computational model. Lastly, the slow discharge process and proposed solutions for reducing the adverse effect of the heat of adsorption on storage capacity, including in situ thermal energy storage, are discussed.

Pore size determination in modified micro- and mesoporous materials. Pitfalls and limitations in gas adsorption data analysis

Abstract: Physical gas adsorption is extensively used in the characterization of micro- and mesoporous materials and is often considered as a straightforward-to-interpret technique. However, physical phenomena like the tensile strength effect, adsorbate phase transitions, and monolayer formation in combined micro- and mesoporous materials frequently lead to extra contributions in the adsorption isotherm. Models for pore size determination mostly do not account for this, and assignment to real pores leads to improper analysis of adsorption data. In this review, common pitfalls and limitations in the analysis of pore size distributions derived from adsorption isotherms of micro- and mesoporous materials are identified and discussed based on new results and examples reported in the recent literature.

Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Abstract: Entropy generation minimization (finite time thermodynamics, or thermodynamic optimization) is the method that combines into simple models the most basic concepts of heat transfer, fluid mechanics, and thermodynamics. These simple models are used in the optimization of real (irreversible) devices and processes, subject to finite‐size and finite‐time constraints. The review traces the development and adoption of the method in several sectors of mainstream thermal engineering and science: cryogenics, heat transfer, education, storage systems, solar power plants, nuclear and fossil power plants, and refrigerators. Emphasis is placed on the fundamental and technological importance of the optimization method and its results, the pedagogical merits of the method, and the chronological development of the field.

Adsorbents: Fundamentals and Applications

Abstract: Preface. 1. Introductory Remarks. 2. Fundamental Factors for Designing Adsorbent. 3. Sorbent Selection: Equilibrium Isotherms, Diffusion, Cyclic Processes, and Sorbent Selection Criteria. 4. Pore Size Distribution. 5. Activated Carbon. 6. Silica Gel, MCM, and Activated Alumina. 7. Zeolites and Molecular Sieves. 8. &pi -Complexation Sorbents and Applications. 9. Carbon Nanotubes, Pillared Clays, and Polymeric Resins. 10. Sorbents for Applications. Author Index. Subject Index.

Pressure swing adsorption

Abstract: A pressure swing adsorption cycle comprised of blowdown, purge, pressurization, feed, pressure equalization and rinse steps provided recovery from an atmospheric air feed, essentially dry and free of carbon dioxide, of a high yield of high purity nitrogen gas and a high yield of a product gas rich in oxygen as well as recovery of a residual feed byproduct gas for recycle with the air feed.

Finite Time Thermodynamic Optimization or Entropy Generation Minimization of Energy Systems

Abstract: Abstract The historical background, research development, and the state-of-the-art of finite time thermodynamic theory and applications are reviewed from the point of view of both physics and engineering. The emphasis is on the performance optimization of thermodynamic processes and devices with finite-time and/or finite-size constraints, including heat engines, refrigerators, heat pumps, chemical reactions and some other processes, with respect to the following aspects: the study of Newton's law systems, an analysis of the effect of heat resistance and other irreversible loss models on the performance, an analysis of the effect of heat reservoir models on the performance, as well as the application for real thermodynamic processes and devices. It is pointed out that the generalized thermodynamic optimization theory is the development direction of finite thermodynamics in the future.