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Nucleation Et Dynamique De Bulles De Cavitation Dans Des Liquides Confines Sous Tension
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Book Synopsis Nucléation et dynamique de bulles de cavitation dans des liquides confinés sous tension by : Mathieu Pellegrin
Download or read book Nucléation et dynamique de bulles de cavitation dans des liquides confinés sous tension written by Mathieu Pellegrin and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, nous nous sommes intéressés à la cavitation de bulles de vapeur dans un liquide confiné sous tension (c'est-à-dire sous pression négative). Ce travail s'est développé en étudiant deux aspects différents mais complémentaires : la simulation numérique et l'expérience biomimétique. L'étude numérique utilise la simulation par dynamique moléculaire d'un liquide confiné dans une cellule solide. Cette méthode nous a permis d'étudier précisément l'effet de l'interaction entre le solide et le liquide (angle de contact), mais aussi de la géométrie sur la nucléation de bulles de vapeur. Nous avons également étudié l'interaction entre deux cellules voisines, et ainsi par comparaison avec un modèle, nous avons mis en évidence une corrélation entre deux évènements de cavitation ainsi que les paramètres importants dans ce phénomène. L'étude expérimentale, quant à elle, a été réalisée sur un dispositif en hydrogel de polymère inspiré de systèmes naturels. Cette méthode nous permet d'étudier un système ayant des caractéristiques mécaniques proches des observations naturelles sur les sporanges de fougères tout en pouvant contrôler sa géométrie. Nous avons alors mis en évidence l'effet de l'épaisseur des parois entre cellules permettant d'observer des cavitations isolées ou groupées de plusieurs centaines de bulles. La taille des cellules permet de mesurer des vitesses de propagation allant jusqu'à plus de 800 m/s. A l'aide d'un modèle acoustique nous avons mis en évidence les paramètres importants dans cette propagation.
Book Synopsis Dynamique de bulles de cavitation dans de l'eau micro-confinée sous tension. Application à l'étude de l'embolie dans les arbres by : Olivier Vincent (physicien).)
Download or read book Dynamique de bulles de cavitation dans de l'eau micro-confinée sous tension. Application à l'étude de l'embolie dans les arbres written by Olivier Vincent (physicien).) and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les liquides sont capables, comme les solides, de supporter des forces de traction. Ils sont alors à pression négative (c'est-à-dire en tension), dans un état qui est métastable. Le retour vers un état stable à pression positive peut se faire par la nucléation d'une bulle, un processus appelé cavitation. Dans cette thèse nous nous intéressons aux propriétés de la cavitation en milieu confiné, avec un accent particulier sur la dynamique des bulles. Ce sujet est motivé par l'étude du transport de l'eau dans les arbres dont une partie (la sève montante) se fait sous tension, dans des canaux micrométriques. La cavitation entraîne alors l'embolie des éléments conducteurs de sève, c'est-à-dire leur remplissage par du gaz. Une grande partie du manuscrit est consacrée à l'étude de la cavitation dans un milieu modèle, où de l'eau est confinée dans des inclusions sphériques micrométriques au sein d'un hydrogel. L'évaporation passive de l'eau à travers le gel permet de générer des pressions négatives, et la cavitation peut se produire spontanément ou être déclenchée à l'aide d'un laser. Nous résolvons la dynamique subséquente de la bulle à l'aide de diverses méthodes (caméra time-lapse ou caméra rapide, diffusion de la lumière, strobophotographie laser ...) et montrons qu'après une séquence inertielle ultra-rapide, la bulle atteint un état d'équilibre temporaire, puis grossit de manière quasi-statique sous l'effet des flux d'eau dans l'hydrogel, provoquant "l'embolie" de l'inclusion. Une place importante est accordée à un chapitre de théorie qui explore d'une part les propriétés thermodynamiques d'un liquide confiné à pression négative, et d'autre part la dynamique aux temps courts de bulles de cavitation dans de tels systèmes. Nous proposons ainsi une équation de Rayleigh-Plesset modifiée qui rend compte de l'accélération importante des oscillations radiales des bulles que nous avons observée expérimentalement. La compressibilité du liquide et l'élasticité du confinement sont des éléments-clés de ce modèle. Enfin, nous discutons l'application des résultats précédents dans le contexte des arbres, tout en proposant une nouvelle méthode expérimentale qui permet un suivi optique du processus d'embolie. Nous présentons quelques résultats obtenus sur des échantillons de pin sylvestre.
Book Synopsis Soft Matter in Plants by : Kaare Jensen
Download or read book Soft Matter in Plants written by Kaare Jensen and published by Royal Society of Chemistry. This book was released on 2022-09-09 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plants offer some of the most elegant applications of soft matter principles in Nature. Understanding the interplay between chemistry, physics, biology, and fluid mechanics is critical to forecast plant behaviour, which is necessary for agriculture and disease management. It also provides inspiration for novel engineering applications. Starting with fundamental concepts around plant biology, physics of soft matter and viscous fluids, readers of this book will be given a cross-disciplinary and expert grounding to the field. The book covers local scale aspects, such as cell and tissue mechanics, to regional scale matters covering movement, tropism, roots, through to global scale topics around fluid transport. Focussed chapters on water stress, networks, and biomimetics provide the user with a concise and complete introduction. Edited by internationally recognised leading experts in this field with contributions from key investigators worldwide, this book is the first introduction to the subject matter and will be suitable for both physical and life science readers.
Book Synopsis Dynamique de Bulles de Cavitation Dans Des Systèmes Micro-confinés by : Chiara Scognamiglio
Download or read book Dynamique de Bulles de Cavitation Dans Des Systèmes Micro-confinés written by Chiara Scognamiglio and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present thesis focuses on cavitation process, meaning nucleation and dynamics of a bubble within a liquid as a result of pressure decrease. In particular, we investigate the growth of the vapor phase in micrometric volumes of water confined by a poro-elastic material. In systems where water is encapsulated in a porous medium, molecules can evaporate from the pores resulting in a remarkable pressure reduction and bubbles nucleation. Once a vapor bubble nucleates, it can trigger within few microseconds the appearance of other bubbles in the neighbor cavities, activating an ultra-fast avalanche-like phenomenon. We resolved the dynamics and acoustics of cavitation bubbles, in case of singles or multiple nucleation events. The realization of an innovative device where water is encapsulated between a porous material and a glass window opens the way for metastable water investigation. A second part of the manuscript is devoted to a new project where microfluidics and biology are combined and applied to drug delivery. The device consists of an artificial blood vessel in communication with the target tissue accommodated in a purposely designed compartment (tissue-on-a-chip). The walls of the microfluidic channel mimicking the vessel are lined with endothelial cells to reproduce the actual walls of in vivo blood vessels. This device allows to investigate the effects of ultrasound-activated bubbles on the blood vessels wall.
Book Synopsis Cavitation and Tension in Liquids, by : D. H. Trevena
Download or read book Cavitation and Tension in Liquids, written by D. H. Trevena and published by CRC Press. This book was released on 1987 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavitation is the process of formation of voids and clouds of bubbles in liquids under tension. Cavitation and the ability of liquids to withstand tension are therefore topics of considerable importance in a number of disciplines in pure and applied science. The monograph begins with a historical survey of early cavitation research which started with the pioneering work of F M L Donny and Marcelin Berthelot. The theoretical and experimental background to cavitation and the tensile strength of liquids - static and dynamic stressing of liquids and bubble studies - is then discussed before the practical consequences are considered. It is these 'applied' areas in which cavitation has most bearing on everyday life: engineers and marine architects must have an appreciation of the effects of cavitation on hydraulic machinery and ships' propellers while the cavitation properties of the liquid coolant can play a large part in the design and safety of fast nuclear reactors. In the medical field cavitation effects are met in joint cracking, decompression sickness and blood flow. The conclusion of the book, and a survey of the present state of knowledge, are presented by Professor H N V Temperley, who has had a lifetime's experience of cavitation research. This monograph will serve as a complete introduction to cavitation and tension in liquids for students of physics, engineering and chemical engineering. Researchers and teachers will find it a handy reference source. other_titles
Author :Christopher Earls Brennen Publisher :Oxford University Press, USA ISBN 13 :9780195094091 Total Pages :294 pages Book Rating :4.0/5 (94 download)
Book Synopsis Cavitation and Bubble Dynamics by : Christopher Earls Brennen
Download or read book Cavitation and Bubble Dynamics written by Christopher Earls Brennen and published by Oxford University Press, USA. This book was released on 1995 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a coherent and unified treatment of the fundamental physical processes involved in bubble dynamics and the phenomenon of cavitation; applicable to topics from internal combustion engines to the performance of turbines and pumps.
Book Synopsis La cavitation by : Jean-Pierre Franc
Download or read book La cavitation written by Jean-Pierre Franc and published by Presses Universitaires de Grenoble. This book was released on 1995 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Etude de la cavitation dans les milieux confinés by : Abdel Krim Morine
Download or read book Etude de la cavitation dans les milieux confinés written by Abdel Krim Morine and published by . This book was released on 1983 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: DYNAMIQUE DES BULLES DE FAIBLE DIMENSION PAR RAPPORT A LA DISTANCE ENTRE PAROIS. EFFONDREMENT D'UNE BULLE DE CAVITATION ENTRE DEUX PAROIS SOLIDES. INFLUENCE DE SOLUTIONS DE POLYMERES SUR L'EFFONDREMENT D'UNE BULLE DE CAVITATION ENTRE DEUX PAROIS SOLIDES. ETUDE DU COMPORTEMENT D'UNE BULLE SPHERIQUE DE CAVITATION DANS UN FLUIDE PARFAIT COMPRESSIBLE. ETUDE DU BRUIT CAUSE PAR UNE BULLE ISOLEE. ETUDE DE L'EROSION DE CAVITATION
Author :International Atomic Energy Agency Publisher :International Atomic Energy Agency ISBN 13 :9789201063205 Total Pages :72 pages Book Rating :4.0/5 (632 download)
Book Synopsis In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 by : International Atomic Energy Agency
Download or read book In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Book Synopsis Discharge of Selected Rivers of the World by :
Download or read book Discharge of Selected Rivers of the World written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer. This book was released on 1976 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.
Book Synopsis The U.S. Sheep Industry by : Richard P. Stillman
Download or read book The U.S. Sheep Industry written by Richard P. Stillman and published by . This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Geochemistry written by Claude Dubois and published by . This book was released on 1995 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Physics by : Nelson Bolívar
Download or read book Environmental Physics written by Nelson Bolívar and published by Arcler Press. This book was released on 2018-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth is undergoing constant changes from the beginning of its formation. After the formation of the planet around 4.54 billion years ago, it has been changing ever since. In the beginning, it was in a liquid gas form which eventually cooled down and the surface took a hard-solid form during the time period of nearly 2 billion years after the creation of the earth. First life on the surface of earth was created about 3.8 billion years ago. And only less than 5 million years ago Homo sapiens developed. Within this really short period of time of existence compared to the age of the earth, mankind has been developing fast. And the main fuel of this development has been science and the technological advancements derived from the knowledge of science. The development of science started the moment humans created fire for the first time and now the knowledge of science has become so vast and widespread that it is literally impossible for an individual to even go through the complete knowledge acquired by humans. In the knowledge and the scientific practices, the environment plays an important role. As we are surrounded by the materials of the environment, they affect every single effort of science to understand the unknown and to develop new ways of development. In every aspect of science, the environment plays an important role which cannot be neglected or overlooked. To address the effect of the atmosphere and environment around us in our everyday life as well as in the development of science, the scientists have been feeling the necessity to modify the acquired knowledge to acknowledge and understand the effects of environment on the facts explore. And this is where environmental physics comes in. Environmental physics is a part of physics which discuss and describes the effect of environment on many scientific effects and vice versa. In order to understand and face the rapid changes in the atmosphere and to make proper utilization of the discoveries conducted by science, it is important to understand the physical effects of different simulations on the environment and also to develop the ways of controlling them. This book was developed to make the readers easily understand the close interrelation of physics with biology, chemistry, and environmental science as well as providing knowledge about the interrelations within different natural forces and their effects on each other as well as on the environment. If this book is able to help the reads in understanding the deep relationship within different Book jacket.
Book Synopsis Atmosphere and Climate by : Ulrich Foelsche
Download or read book Atmosphere and Climate written by Ulrich Foelsche and published by Springer Science & Business Media. This book was released on 2006-08-11 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents carefully edited and peer-reviewed papers from the 2nd International Workshop on Occultations for Probing Atmosphere and Climate (OPAC-2), held in Graz, Austria. It starts with a general introductory paper and proceeds to address the full range from methodology in general via specific occultation methods (GNSS-LEO, LEO-LEO, stellar and solar) to the use of occultation data, with focus on atmospheric physics, meteorology and climate.
