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Fluid Mechanics at Interfaces 1. Группа авторовЧитать онлайн книгу.

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      Fluid Mechanics at Interfaces 1

       Methods and Diversity

       Edited by

      Roger Prud’homme

      Stéphane Vincent

      First published 2022 in Great Britain and the United States by ISTE Ltd and John Wiley & Sons, Inc.

      Apart from any fair dealing for the purposes of research or private study, or criticism or review, as permitted under the Copyright, Designs and Patents Act 1988, this publication may only be reproduced, stored or transmitted, in any form or by any means, with the prior permission in writing of the publishers, or in the case of reprographic reproduction in accordance with the terms and licenses issued by the CLA. Enquiries concerning reproduction outside these terms should be sent to the publishers at the undermentioned address:

      ISTE Ltd

      27-37 St George’s Road

      London SW19 4EU

      UK

      www.iste.co.uk

      John Wiley & Sons, Inc.

      111 River Street

      Hoboken, NJ 07030

      USA

      www.wiley.com

      © ISTE Ltd 2022

      The rights of Roger Prud’homme and Stéphane Vincent to be identified as the authors of this work have been asserted by them in accordance with the Copyright, Designs and Patents Act 1988.

      Library of Congress Control Number: 2021949304

      British Library Cataloguing-in-Publication Data

      A CIP record for this book is available from the British Library

      ISBN 978-1-78630-816-0

      Preface

      In this book, it is relevant to recall the general objectives of the Systems and Engineering e-journal Thermodynamics of Interfaces and Fluid Mechanics1. The thermodynamics of interfaces and fluid mechanics deals with interfaces, thin spaces that separate media with different properties. These interfaces can denote phase separations, as well as thin flames and discontinuity waves. On a microscopic scale, they can be compared to physical surfaces that are endowed with thermodynamic properties and possess their own constitutive laws. The analysis of systems that contain interfaces involves scale changes and the use of specific techniques, such as asymptotic expansions, the second gradient theory and phase field models. Numerical simulations are used to solve the complex systems studied. Experimentation is an essential step in solving the problems posed. The 2D manifolds that the interfaces form often coexist with 1D manifolds, such as ligaments (atomization), contact lines (drops placed in a line) or Plateau edges (foam).

      The achievement of the general objectives of Thermodynamics of Interfaces and Fluid Mechanics is partly concretized in the first volumes of the Fluid Mechanics at Interfaces series of books. However, the OpenScience journal has a very broad scope and the articles, published here as chapters (reworked by the authors, from French to English, which requires the modification of certain parts of the articles and updated, etc.), represent only a small part of the interface world, the focus resulting from the authors’ choices. The classification of chapters does not follow the chronology of the articles, but has been organized to be coherent.

      The first volume, subtitled Methods and Diversity, focuses more on the sciences, with their various methods of analysis, depending on the scales of space, speed and time, from the microscopic or small scale (starting with molecular and nanoscopic scales characteristic of the matter) to the macroscopic (including meso and interstellar scales), as well as their laws (classical mechanics, quantum mechanics and relativity).

      The chapters are organized as follows:

      Chapter 1 (R. Prud’homme) is an introduction to Fluid Mechanics at Interfaces, and as such, we examine questions raised by the modeling of interfaces in the presence of one or more fluid phases. The following themes are examined: scales of length and time, the definition of interfacial quantities, microscopic and macroscopic balance equations and constitutive laws. These are required to close the systems of equations that we obtain. Solutions are obtained by using asymptotic expansions and the virtual power method.

      Chapter 2 (S. Gouénard, S. Vincent, S. Mimouni) studies two-phase flows. While models have already been developed to study liquid–vapor flows that contain both small, dispersed bubbles and large bubbles (the large bubble model coupled with a dispersed model), the literature has been limited, so far, to laminar regimes. The study presented here relates to the action of turbulence in these two-phase flows, taking into account heat exchanges at the interfaces, as occur in the secondary cooling circuits (exchangers) of nuclear power plants. A new model, using the large-eddy simulation method, is presented here.

      Chapter 3 (M.-A. Chadil, S. Vincent, J.-L. Estivalèzes) studies an original method for calculating the drag force and thermal transfers in flows around the networks of spherical particles. This chapter also examines numerical approaches in a two-phase fluid/solid medium, using particle-resolved methods, i.e. the size of the particles is greater than that of the cells in the calculation mesh. An original approach is proposed to extract momentum and heat transfers from particle-resolved simulations of particulate flows.

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