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  • GESTION DE FLUJOS MULTIFASICOS Y DE ENERGIA PARA APLICACIONES EN EXPLORACION ESPACIAL

     Arias Calderón, Santiago; Suñol Galofre, Francesc Xavier; Garcia Sabate, Anna; Gonzalez Cinca, Ricardo
    Participation in a competitive project

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  • Bubble and Droplet Flow Phenomena at Different Gravity Levels  Open access  awarded activity

     Suñol Galofre, Francesc Xavier
    Defense's date: 2011-07-19
    Department of Applied Physics, Universitat Politècnica de Catalunya
    Theses

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    Two-phase flows are encountered in a wide range of applications both on-ground and in space. The dynamics of such flows in the absence of gravity is completely different from that in normal gravity due to the absence of buoyancy forces. A deeper understanding of the behavior of multiphase flows is essential in order to improve the operation of devices which require the use of two-phase systems. Analytical and experimental work is still needed for enhancing the control of two-phase flows, due to the theoretical complexity and the lack of experimental data for certain configurations. In this work, the behavior of two-phase flows has been studied experimentally in normal gravity and in microgravity conditions. In particular, the single-jet configuration has been investigated for bubbly jets and droplet jets. Dynamics of individual bubbles and droplets as well as the global structure of the jets has been considered. The opposed-jet configuration has been investigated for bubbly flows. Different separation between jets and orientation angles have been studied in normal gravity, and the obtained results have been compared to the microgravity case. A numerical model has been implemented to study single-phase jet impingement and opposed bubbly jets at different gravity levels. Good qualitative agreement between the simulations and the experiments has been obtained. The bubble bouncing process, prior to coalescence, after collision with a flat free surface has been also studied experimentally in normal gravity conditions. The results presented in this work will help to improve the general understanding of two-phase flows in normal gravity and in microgravity conditions, with general applications on mixing devices, environmental and propulsion systems.

  • ELGRA Award

     Suñol Galofre, Francesc Xavier
    Award or recognition

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  • ESA - SYT 2011 - Final Report

     Suñol Galofre, Francesc Xavier; Maldonado, Oscar; Vidal Arco, Eduardo; Garcia Sabate, Anna; Gonzalez Cinca, Ricardo
    Date: 2011-12
    Report

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  • Droplet collisions after liquid jet breakup in microgravity conditions

     Suñol Galofre, Francesc Xavier; Gonzalez Cinca, Ricardo
    Journal of physics: conference series
    Date of publication: 2011
    Journal article

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  • Bubbly jet impingement in different liquids

     Suñol Galofre, Francesc Xavier; Gonzalez Cinca, Ricardo
    Microgravity science and technology
    Date of publication: 2011-02-16
    Journal article

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    The impingement of bubbly jets in distilled water and ethanol has been experimentally studied on ground. An experimental apparatus for the study of jet impingement on ground and inmicrogravity has been designed. The opposed-jet configuration with changeable orientation is used in order to study which is the better disposition to achieve an efficient mixing process. The impact angle between jets that can be changed from 0◦ (frontal collision) up to 90◦ (perpendicular collision). The impinging jets are introduced into a test tank full of liquid by means of two bubble injectors. The bubble generation method, insensitive to gravity level for low Bond numbers, is based on the creation of a slug flow inside a T-junction of capillary tubes of 0.7 mm of diameter. Bubble velocities at the injector outlet and generation frequencies can be controlled by changing gas and liquid flow rates. Individual bubble properties and coalescence events, as well as the whole jet structure are analyzed from the images recorded by a high speed camera. Bubble velocities are compared with the velocity field of a single-phase jet. Rate of coalescence between bubbles is found higher in ethanol than in water, creating a higher dispersion in bubble sizes.

  • Opposed bubbly jets at different impact angles: jet structure and bubble properties

     Suñol Galofre, Francesc Xavier; Gonzalez Cinca, Ricardo
    International journal of multiphase flow
    Date of publication: 2010-08
    Journal article

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    The structure of two colliding water jets containing small gas bubbles is studied experimentally. The effects of the separation distance between jets, as well as the orientation angle, on the spatial distribution of bubbles have been considered. Results on the global structure of the final jet and bubble properties have been obtained using a high-speed video camera, and measurements of the positions of coalescence events are presented. Jets are introduced through inclined pipes (with a diameter of 0.7 mm) into a large water tank to avoid wall effects. Inclination angle has been changed from 0 to 45 with respect to the horizontal, resulting in a 0 up to 90 impact angle between jets. Generation of bubbles is controlled by a T-junction device where a regular slug-flow is created prior to injection. Bubble sizes have been measured, and a mean diameter of around 1 mm has been obtained using high values of the liquid flow rate. In the studied range of separation distances between the bubbly jets, a more homogeneous dispersion of bubbles is created as the distance between jets is decreased and the momentum flux of each jet is increased. Higher numbers of coalescences are observed when using smaller distance between jets, and the obtained measurements revealed that the number of bubble coalescence events is reduced significantly using high values of liquid flow rates.

  • Rise, bouncing and coalescence of bubbles impacting at a free surface

     Suñol Galofre, Francesc Xavier; Gonzalez Cinca, Ricardo
    Colloids and surfaces A: physicochemical and engineering aspects
    Date of publication: 2010-08-05
    Journal article

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  • Access to the full text
    Tools for creating LaTeX-integrated graphics and animations under GNU/Linux  Open access

     Suñol Galofre, Francesc Xavier
    The PracTeX Journal
    Date of publication: 2010-06-08
    Journal article

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    This paper describes how to easily create graphics and animations that can be included in LATEX documents. This article discusses three kinds of figures: plots, schematics, and pictures. The tools presented here can quickly generate plots, and are based on simple gnuplot and bash scripts that display the final result on the screen. Ipe is an excellent program to deal with complex figures and schematics, and the animate package is used to make a series of figures change over time to simulate a movie. All the programs used in this article are free software.

  • ESA - DYT 2010 - Final Report

     Suñol Galofre, Francesc Xavier; Maldonado Diaz, Oscar; Garcia Sabate, Anna; Gonzalez Cinca, Ricardo
    Date: 2010-12
    Report

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  • Gestión de fluidos multifásicos en condiciones de baja gravedad

     Suñol Galofre, Francesc Xavier; Arias Calderón, Santiago; Gonzalez Cinca, Ricardo
    Participation in a competitive project

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  • Access to the full text
    Bouncing of bubbles impacting at a free surface  Open access

     Suñol Galofre, Francesc Xavier; Gonzalez Cinca, Ricardo
    Bubbles and drops
    Presentation's date: 2009-09-23
    Presentation of work at congresses

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  • Bubbly jet impingement in different liquids

     Suñol Galofre, Francesc Xavier; Gonzalez Cinca, Ricardo
    European Conference for Aerospace Sciences
    Presentation's date: 2009-07
    Presentation of work at congresses

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    An experimental setup for the study of bubbly jets collision in microgravity has been designed. On ground preliminary results are presented in order to be compared with those obtained in a near future in low gravity conditions. The opposed-jet configuration is used with the objective to force the collision of two jets, with an impact angle between them that can be changed from 0º (frontal collision) up to 90º. The colliding jets are introduced into a test tank full of liquid by means of two bubble injectors. The bubble generation method is based on the creation of a slug flow inside a junction of capillary tubes of 0.7 mm of diameter. Bubble velocities at the injector outlet and generation frequencies can be controlled by changing the gas and liquid flow rates. We present results on the role played by the impact angle and bubble velocities on the structure of the final jet. A systematic study for different gas and liquid flow rates has been carried out in liquids with different values of surface tension.

  • Design of an experiment for the study of bubble jet interactions in microgravity

     Suñol Galofre, Francesc Xavier; Maldonado, O; Pino, R; Gonzalez Cinca, Ricardo
    Microgravity science and technology
    Date of publication: 2009-01
    Journal article

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  • On ground study of bubble jets collision

     Suñol Galofre, Francesc Xavier; Gonzalez Cinca, Ricardo
    59th International Astronautical Congress
    Presentation of work at congresses

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  • Setup design and ground investigation for a microgravity experiment on bubble dynamics and coalescence

     Suñol Galofre, Francesc Xavier; Pino, R; Maldonado, O; Gonzalez Cinca, Ricardo
    Experiments in Space and beyond
    Presentation of work at congresses

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  • ORDEN, RUIDO Y DINÁMICAS EMERGENTES BAJO NOLINEALIDADES

     Ramirez de La Piscina Millan, Laureano; Peñaranda Ayllon, Angelina; Haurie Ibarra, Laia; Meca Alvarez, Esteban; Rodriguez Cantalapiedra, Inmaculada; Lacasta Palacio, Ana Maria; Benitez Iglesias, Raul; Formosa Mitjans, Joan; Gonzalez Cinca, Ricardo; Suñol Galofre, Francesc Xavier; Arias Calderón, Santiago
    Participation in a competitive project

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