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Shock waves from nonspherical cavitation bubbles

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Collapse phenomena of deformed cavitation bubbles

Outi Supponen

Cavitation bubbles are a topic of long-standing interest owing to the powerful phenomena associated with their collapse. Their unique ability to focus energy typically causes damage in hydraulic machinery (turbines, pumps, propellers, ...) but, if managed ...

EPFL2017

We consider the hyperbolic Yang-Mills equation on the Minkowski space

\reels^{4+1}

. Our main result asserts that this problem is globally well-posed for all initial data whose energy is sufficiently small. This solves a longstanding open problem. ...

Annal Mathematics2017

Luminescence from cavitation bubbles deformed in uniform pressure gradients

Mohamed Farhat, Danail Obreschkow, Philipp Kobel, Outi Supponen

Presented here are observations that demonstrate how the deformation of millimetric cavitation bubbles by a uniform pressure gradient quenches single-collapse luminescence. Our innovative measurement system captures a broad luminescence spectrum (wavelengt ...

2017

SEPIA - Social Cushioning of Energy Price Increases and Public Acceptability

Philippe Thalmann, Frank Vöhringer, Andrea Baranzini, Dario Stocker, Wolfgang Knoke

This report is about finding ways to make green taxes, such as taxes on 'dirty' energy, more acceptable, in particular by chosing a mode of revenue recycling that is prefered by the population. Thus, it investigates distributional and other effects of ener ...

2016

Energy diaphragm walls for Turin metro

Chiara Cornelio, Alice Di Donna

Energy diaphragm walls for Turin metro: The increasing need for renewable sources of energy for heating and cooling of buildings and infrastructures makes energy geostructures an innovative and interesting technology, which is rapidly spreading all around ...

2016

RANS computations for identification of 1-D cavitation model parameters: application to full load cavitation vortex rope

François Avellan, Christophe Nicolet, Andres Müller, Sébastien Alligné

Due to the massive penetration of alternative renewable energies, hydropower is a key energy conversion technology for stabilizing the electrical power network by using hydraulic machines at off design operating conditions. At full load, the axisymmetric c ...

International Association For Hydraulic Research2016

High voltage x-ray power supply system with dual energy storage system

Dimitri Torregrossa, Mauro Carpita

Medical X-ray power generator system comprising an energy storage section comprising at least one battery unit and at least one supercapacitor (SC) unit, wherein the SC unit and the battery unit are connected in a way as to allow a bidirectional exchange o ...

2016

Energy Efficiency Valuation and Mortgage's Implicit Insurance

Philippe Bélanger

This thesis has two objectives. The first objective is to better understand the value of energy efficiency in buildings and its relationship to secondary market real estate prices. The second objective is to understand the cost of the implied insurance inc ...

EPFL2015

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We present detailed visualizations of the micro-jet forming inside an aspherically collapsing cavitation bubble near a free surface. The high-quality visualizations of large and strongly deformed bubbles disclose so far unseen features of the dynamics insi ...

Iop Publishing Ltd2015

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Institute of Physics2015

We consider the hyperbolic Yang-Mills equation on the Minkowski space

\reels^{4+1}

. Our main result asserts that this problem is globally well-posed for all initial data whose energy is sufficiently small. This solves a longstanding open problem. ...

Annal Mathematics2017