Showing papers by "Daniel Tondeur published in 1995"
TL;DR: In this paper, a two-dimensional model is developed to describe the hydrodynamics, heat transfer and adsorption phenomena associated with the adsorptive storage of natural gas (NG) in cylindrical reservoirs.
Abstract: A two-dimensional model is developed to describe the hydrodynamics, heat transfer and adsorption phenomena associated with the adsorptive storage of natural gas (NG) in cylindrical reservoirs. Intraparticle and film resistances to both heat and mass transfer are neglected. In the momentum equation, Ergun's law is considered locally valid and is extended to two dimensions. These assumptions are fully justified in the paper. Numerical results are presented concerning the pressurization and blowdown of an ultra-lightweight 50 litre cylinder, commercially available for the storage of compressed NG, if it were filled with an activated carbon having a good adsorptive storage capacity. A simple formula is also proposed to predict the filling times for fast charges. The predicted temperature changes in the packed-bed are in good agreement with those reported in the literature for an experimental charge/discharge.
52 citations
TL;DR: In this paper, a method of analysis and representation of these phenomena, based on pseudo-characteristics defined as lines propagating constant values of particular concentrations, is proposed to represent the essential features of the concentration profiles at all times, to adjust the operating times and optimize the layer thickness.
44 citations
TL;DR: In this paper, a method of global characterization of the behavior of pressure-swing-adsorption (PSA) cycles based on statistical experiments design is proposed, the "experiments" being actually numerical (simulation).
25 citations
TL;DR: In this paper, a nonexhaustive inventory of the paradigms used in the field of chromatographic adaption is presented, including the equilibrium-stage approach, the theoretical plate, the kinematic wave, the constant pattern, the Langmuir isotherm, and a few others.
Abstract: Modern approaches to modeling adsorption and chromatographic operations rely, implicitly or explicitly, on a restricted number of paradigms, such as the equilibrium-stage approach and the theoretical plate, the kinematic wave, the constant pattern, the Langmuir isotherm, and a few others. Their role in organizing knowledge and experience in adsorption research is considerable, and the set of currently used paradigms expresses the state of mind, the dominant ideology in the field at a given instant. We propose a nonexhaustive inventory of these paradigms, analyze their origin and their scientific supports, and discusse their role in the progress of the field, their conservative function, and their contribution to strengthening the concerned community or to opening it to others. Illustrations are given that paradigms are sometimes paradoxes, and finally, a discussion of the missing paradigms is proposed, i.e., paradigms which have not yet been established or recognized, but which may be the keys to future progress
10 citations