H2020Индивидуална стипендия2019–2021

RESIST · Resolving Effects of particle Shape and Inertia in Scalar Transport

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2019-07-01 → 2021-06-30
Финансиране от ЕС: 212 934 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Обменът на вещества между малки частици с различна форма и турбулентна течност се анализира чрез примери като разтваряне на твърди вещества или абсорбция на хранителни вещества от фитопланктон. Това помага за създаването на по-точни модели за поведението на тези системи в природата и индустрията.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Resolving Effects of particle Shape and Inertia in Scalar Transport

Engineering and nature are filled with examples of small particles exchanging material with a turbulent environment, including: the dissolution of fine solids in industrial processes, the preparation of crystalline products used in pharmaceuticals, the absorption of nutrients by phytoplankton and the encounter rates of bacteria with marine viruses in our oceans. These “particles”, as we call them here, come in a huge variety of different shapes, sizes and densities relative to the turbulent fluid in which they are suspended. To predict and understand how these systems behave, engineers and scientists need physical insights and predictive models for the exchange of material (“mass transfer” or “scalar transport”) between particles and the fluid. It is well understood that properties like size, shape and density affect how a particle moves through and perceives the surrounding flow. Yet, current models of mass transfer focus on spherical particles and there been no systematic study of how average mass transfer depends upon particle and fluid properties when the flow is turbulent and particles cannot be idealised as spherical. Secondly, due to a lack of available tools and knowledge, no study has been able to establish cause-and-effect relationships between the flow field near the particle’s surface (where mass transfer occurs) and the average mass transfer rate for freely suspended non-spherical particles in turbulence. This information is crucial to developing and validating a modelling approach. This project has aimed to address these two gaps in our scientific knowledge and contribute to the training-through-research of the Fellow to develop their skills as an independent researcher. The scientific objectives of the project have been to: develop ways to measure mass transfer to small particles in turbulent flows at the particle-scale and at an aggregate scale; to quantify the role of particle shape and inertia in the mass transfer process; to apply these methods to resolve mass transfer at the particle scale in turbulent suspensions; and to identify and quantify the mechanisms by which mass transfer is enhanced. The project has mostly achieved these objectives.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

When small, rigid particles are immersed in a turbulent fluid, they tumble, slip, concentrate and re-orientate themselves amidst a chaotic flow. Simultaneously, material or heat (passive scalars) may be transferred from the surface by convection and diffusion. Nature and engineering are replete with examples: planktonic osmotrophs absorb nutrients from turbulent ocean waters, and industrial processes grow crystals in agitated suspension, to name but two. Such particles are rarely ever spherical. Yet, present approaches overlook this, neglecting the convective transport mechanisms governed by shape and inertia and fail to predict their consequences, for example, in the adaptation strategies of marine diatoms. To address this problem, this project pairs a researcher with experience of fundamental turbulence physics from working in Germany with an expert in applied experimental fluid mechanics at a UK university, achieving a mutually beneficial exchange of knowledge. The Fellow will parametrically survey the effects of aspect ratio and inertia in the mass transfer to ellipsoidal particles, by reacting deformed ion-exchange resin beads in a turbulent solution to determine transport rates as a function of turbulence, fluid and particle properties. This will be followed by a detailed investigation of the underlying flow physics using state-of-the-art laser induced fluorescence and velocimetry techniques, allowing cause-and-effect mechanisms to be established between macro- and micro-scale effects. The project will target its dissemination activities at scientific communities where immediate impact is expected, including chemical and energy engineering and oceanography. This pairing and choice of project, together with the host’s capabilities and track record, will ensure successful completion of this ambitious research project and maximally support the Fellow’s career development.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSITY OF SOUTHAMPTON · SOUTHAMPTONКоординаторОбединеното кралство