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Maggiolo, Dario (2017) Numerical modeling and fluid-dynamic optimisation of fuel cells and flow batteries systems. [Ph.D. thesis] Full text disponibile come:
Abstract (english)Nowadays, the energy challenge is one of the largest driving forces behind many research efforts. Future energy strategies include smart ways to store and convert energy on demand. On this exciting perspective, fuel cells and flow batteries play a key role, the former in converting energy into propulsion, the latter in storing renewable energy surplus. Nevertheless, some main technological issues still must be overcome, such as limited peak performances often caused by poor fluid-mechanic efficiency. The fluid-dynamic optimisation of fuel cells and flow batteries systems is the main aim of the present thesis work. To this end, the focus is set on studying liquid-vapour two-phase flows and dispersion dynamics in fibrous porous media, by means of Lattice-Boltzmann numerical models, in order to catch the effects of microscale phenomena on macroscale features of both technologies. Present findings offer new insights into understanding fundamental physical behaviours in fuel cells and flow batteries, and give a guideline for good and innovative design practice. Abstract (italian)Al giorno d'oggi, la sfida energetica è una delle più importanti spinte alla ricerca scientifica. Le strategie energetiche future includono vie alternative ed efficienti per stoccare e convertire l'energia su richiesta. In questa prospettiva entusiasmante, le celle a combustibile e le batterie a flusso svolgono un ruolo chiave, le prime nella conversione dell'energia in propulsione, le seconde nello stoccaggio dei surplus derivanti da energia rinnovabile. Tuttavia, rimangono ancora da superare alcuni importanti aspetti tecnologici, come ad esempio le limitate prestazioni di picco spesso causate da una scarsa efficienza fluido-meccanica. L'obiettivo principale della presente tesi è l'ottimizzazione fluidodinamica delle celle a combustibile e delle batterie a flusso. A tal fine, la ricerca si focalizza
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