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4 results on '"Nicolas Blet"'

1. Analytical steady-state model based on Fourier integral transforms for cylindrical heat pipes under axisymetric conditions

Author

Nicolas Blet, Denis Maillet, Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA ), and Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Fluid Flow and Transfer Processes, 010506 paleontology, Materials science, 060102 archaeology, Mechanical Engineering, 06 humanities and the arts, Mechanics, Condensed Matter Physics, 01 natural sciences, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], Physics::Fluid Dynamics, symbols.namesake, Heat pipe, Fourier transform, Heat transfer, Thermal, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], symbols, Coupling (piping), 0601 history and archaeology, Boundary value problem, Condenser (heat transfer), ComputingMilieux_MISCELLANEOUS, Evaporator, 0105 earth and related environmental sciences
Abstract

A thermohydraulic analytical model of a capillary cylindrical heat pipe in steady-state is proposed in this article. It is based on an original representation by thermal quadrupoles to describe heat transfer in the wall and in the porous wick, via the use of Fourier integral transforms. Thanks to a validation from literature results, this model provides two-dimensional axisymetric thermal fields and one-dimensional pressure and velocity profiles of both liquid and vapour flows. Different developments and solutions are introduced according to the kind of boundary conditions at evaporator and at condenser, and with a more or less strong thermohydraulic coupling at the liquid/vapour interface. For the simple case with imposed uniform heat fluxes, intrinsic properties of the heat pipe are originally defined. The introduced model offers a generalisation of analytical models of standard heat pipe as a design or optimisation tool. Wider developments of analytical models for more complex three-dimensional geometries of heat pipe and in transient regime can be expected.

Published
2022
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2. Experimental and Numerical Analysis of Start-Up of a Capillary Pumped Loop for Terrestrial Applications

Author

Sébastien Dutour, Flavio Accorinti, Vincent Ayel, Nicolas Blet, Yves Bertin, Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA ), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Groupe de Recherche Energétique, Plasmas et Hors Equilibre (LAPLACE-GREPHE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, Convection, Optimisation, Systèmes Thermiques (COST ), Département Fluides, Thermique et Combustion (FTC), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-Institut Pprime (PPRIME), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Discretization, Capillary action, 020209 energy, 02 engineering and technology, 7. Clean energy, Transient analysis, 020401 chemical engineering, Thermal, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, 0204 chemical engineering, Navier–Stokes equations, ComputingMilieux_MISCELLANEOUS, Physics, Fluids, Experimental analysis, Inertia (Mechanics), Methanol, Mechanical Engineering, Numerical analysis, Modeling, Mechanics, Computer simulation, Condensed Matter Physics, Line (electrical engineering), Loop (topology), Mechanics of Materials, Vapors, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], Transients (Dynamics), Transient (oscillation), Navier-Stokes equations
Abstract

A study on the start-up phases of a capillary pumped loop for terrestrial application (CPLTA) is proposed in this paper. Experimental analysis and numerical modeling, using a one-dimensional spatial discretization model, based on thermohydraulic equations and solved by nodal network/electrical analogy, are presented to study the thermal and hydraulic behavior of the loop for methanol and n-pentane as working fluids, during start-up transient phases. The experimental observations are backed up by the numerical model to help the transient and steady analysis of this kind of loop. The precise numerical study allows to have a better understanding of the complicated phenomena happening during the start-up and to have a global view of the behavior of the capillary pumped loop for integrated power (CPLIP) during these phases. In this study, it will be also shown the influence of vapor line solid walls thermal inertia and its impact on the dynamic behavior and on the success of the start-up of the loop.

Published
2019
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3. TRANSIENT MODELING OF CPL FOR TERRESTRIAL APPLICATION, PART B: RESERVOIR MODELING IMPROVEMENT

Author

Yves Bertin, Vincent Ayel, Cyril Romestant, Vincent Platel, Nicolas Blet, Institut Pprime (PPRIME), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, LABORATOIRE DE THERMIQUE ENERGETIQUE ET PROCEDES (EA1932) (LATEP), and Université de Pau et des Pays de l'Adour (UPPA)

Subjects
Heat pipe, Petroleum engineering, Reservoir modeling, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], Transient (oscillation), Geology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014
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4. TRANSIENT MODELING OF CPL FOR TERRESTRIAL APPLICATION, PART A: NETWORK CONCEPT & INFLUENCE OF GRAVITY ON THE CPL BEHAVIOR

Author

Vincent Platel, Cyril Romestant, Yves Bertin, Vincent Ayel, Nicolas Blet, Institut Pprime (PPRIME), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, LABORATOIRE DE THERMIQUE ENERGETIQUE ET PROCEDES (EA1932) (LATEP), and Université de Pau et des Pays de l'Adour (UPPA)

Subjects
Heat pipe, Gravity (chemistry), Meteorology, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], Transient (oscillation), Mechanics, Geology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014
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