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7 results on '"López-Quesada, Guillermo"'

3. Isothermal pressure driven gas microflows in tapered microchannels with circular cross section: numerical and experimental investigations

Author

Zhang, Dingdong, Schweizer, Franz, López Quesada, Guillermo, Bergdolt, Samuel, Hengsbach, Stefan, Bade, Klaus, Valougeorgis, Dimitris, Tondu, Bertrand, Rojas-Cárdenas, Marcos, Colin, Stéphane, Institut Clément Ader (ICA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT), Karlsruhe Nano Micro Facility, University of Thessaly [Volos] (UTH), Équipe Mouvement des Systèmes Anthropomorphes (LAAS-GEPETTO), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
[SPI]Engineering Sciences [physics], Microfluidics, rarefied gas flows, tapered microchannels, two photon polymerization, Microfluidics rarefied gas flows tapered microchannels two photon polymerization
Abstract

International audience

Published
2023

4. Computational study of a novel Knudsen pump design exploiting drilling and 3D printing techniques in low thermal conductivity materials

Author

López Quesada, Guillermo, Tatsios, Giorgos, Colin, Stéphane, Valougeorgis, Dimitris, Baldas, Lucien, Barrot, Christine, Rojas-Cárdenas, Marcos, Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), University of Thessaly [Volos] (UTH), Professor Srinivas Garimella, Georgia Institute of Technology, European Project: 643095,H2020,H2020-MSCA-ITN-2014,MIGRATE(2015), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Vacuum micropump, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, kinetic modeling, ComputingMilieux_MISCELLANEOUS, thermal transpiration
Abstract

International audience

Published
2018

5. Proposal of a novel Knudsen pump design benefitting from drilling and 3D printing techniques in low conductivity materials

Author

López Quesada, Guillermo, Tatsios, Giorgos, Colin, Stéphane, Valougeorgis, Dimitris, Baldas, Lucien, Barrot, Christine, Rojas-Cárdenas, Marcos, Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), University of Thessaly [Volos] (UTH), European Project: 643095,H2020,H2020-MSCA-ITN-2014,MIGRATE(2015), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
Vacuum micropump, kinetic modeling, microfabrication, thermal transpiration, multistage, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience; Over the past two decades a large number of MEMS and micro-devices have been developed. These miniaturized systems, such as lab-on-chip sensors, gas chromatography analyzers, etc., require micro-pumps for air sampling through the testing stages of the device. Additionally, some microscale components such as radio frequency switches, microscopic vacuum tubes and other parts that depend on electron or ion optics, require certain vacuum environment for proper operation. Simply sealing the devices is not sufficient because leaks and outgassing are excessively detrimental in vacuum devices at microscale level. Accordingly, such components may need vacuum pumping to maintain proper functionality. The thermal transpiration phenomenon has been extensively investigated; however, functional prototypes based on this phenomenon have been only recently developed. The Knudsen pump, which is one of the devices exploiting this well-known phenomenon, is able to generate a macroscopic gas flow by solely exploiting a tangential temperature gradient along a surface without requiring any external pressure gradient [1]. Specific geometrical and operational configurations have been investigated to optimize the efficiency of the pump in terms of generated mass flow rate and pressure difference, so analytical and numerical solutions for different configurations have been provided [2] and experimental measurements for thermal transpiration flow through channels have been reported [3]. Still, fabricating a Knudsen pump is not a trivial task mainly due to microfabrication difficulties and constraints linked to the control of local thermal gradients [4, 5].

Published
2018

6. Pumping effect due to temperature gradients imposed in a multistage assembly consisting of long tapered orthogonal channels

Author

López Quesada, Guillermo, Tatsios, Giorgos, Rojas-Cárdenas, Marcos, Baldas, Lucien, Barrot, Christine, Colin, Stéphane, Valougeorgis, Dimitris, Institut Clément Ader (ICA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), University of Thessaly [Volos] (UTH), European Project: 643095,H2020,H2020-MSCA-ITN-2014,MIGRATE(2015), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)

Subjects
Physics::Fluid Dynamics, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience; The temperature driven rarefied gas flow and the associated pressure difference in a multistage assembly consisting of a series of channels with linearly diverging or converging rectangular cross sections are computationally investigated. Each stage of the multistage assembly is consisting of one converging and one diverging channel. The net mass flow rate and the induced pressure difference between the inlet and outlet of the multistage assembly are parametrized in terms of the geometrical and operational data, paying specific attention to the diode effect and to the number of stages. The flow may be in the whole range of the Knudsen number and therefore modeling is based on kinetic theory, while the channels are taken efficiently long in order to justify the implemented infinite capillary methodology. Various flow setups are investigated to obtain the characteristic curves of the net mass flow rate versus the pressure difference in terms of channel geometry, input pressure, imposed temperature ratio and number of stages. The present work provides a powerful modeling tool in the manufacturing of a multistage Knudsen pump meeting certain pumping specifications.

Published
2018

7. Design Guidelines for Thermally Driven Micropumps of Different Architectures Based on Target Applications via Kinetic Modeling and Simulations.

Author

López Quesada, Guillermo, Tatsios, Giorgos, Valougeorgis, Dimitris, Rojas-Cárdenas, Marcos, Baldas, Lucien, Barrot, Christine, and Colin, Stéphane

Subjects
MICROPUMPS, THERMAL conductivity, SIMULATION methods & models, MANUFACTURING processes, ARCHITECTURE
Abstract

The manufacturing process and architecture of three Knudsen type micropumps are discussed and the associated flow performance characteristics are investigated. The proposed fabrication process, based on the deposition of successive dry film photoresist layers with low thermal conductivity, is easy to implement, adaptive to specific applications, cost-effective, and significantly improves thermal management. Three target application designs, requiring high mass flow rates (pump A), high pressure differences (pump B), and relatively high mass flow rates and pressure differences (pump C), are proposed. Computations are performed based on kinetic modeling via the infinite capillary theory, taking into account all foreseen manufacturing and operation constraints. The performance characteristics of the three pump designs in terms of geometry (number of parallel microchannels per stage and number of stages) and inlet pressure are obtained. It is found that pumps A and B operate more efficiently at pressures higher than 5 kPa and lower than 20 kPa, respectively, while the optimum operation range of pump C is at inlet pressures between 1 kPa and 20 kPa. In all cases, it is advisable to have the maximum number of stages as well as of parallel microchannels per stage that can be technologically realized. [ABSTRACT FROM AUTHOR]

Published
2019
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