Fluid Mechanics at Interfaces 1

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Interfaces are present in most fluid mechanics problems. They not only denote phase separations and boundary conditions, but also thin flames and discontinuity waves.<i> Fluid Mechanics at Interfaces 1</i> focuses on the science of interfaces, in particular, using various scientific methods of analysis relating to space, speed and time. Our investigation takes us from the microscopic or small scale (starting with molecular and nanoscopic scales) to the macroscopic (including meso and interstellar scales), and also explores the laws of interfaces (classical mechanics, quantum mechanics and relativistic mechanics).<br /><br />Chapter 1 examines the questions raised by modeling interfaces in the presence of one or more fluid phases. Chapter 2 discusses the action of turbulence in liquid–vapor flows that contain both small, dispersed bubbles as well as large bubbles, with heat exchanges at the interfaces. In addition, a new model is presented, using large eddy simulation (LES). Chapter 3 studies an original method for calculating the drag force and thermal transfers in flows around networks of spherical particles, while Chapter 4 focuses on the relationships between interfaces and critical fluids.<br /><br />Chapter 5 examines shearing, which causes anomalies in the Brownian motion of particles in strongly fluctuating near-critical mixtures, and Chapter 6 introduces basic concepts related to combustion interfaces, raising the question of the combustion of solids, before ending with a brief presentation of the Rankine–Hugoniot theory and a historical overview of the research carried out in the field of combustion.

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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 - фото 1

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 Mechanics 1. 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.

Chapter 4(R. Prud’homme) studies the relationships between interfaces and critical fluids. The vicinity of the critical liquid–vapor point of pure bodies presents unique behaviors. In particular, the interface between the liquid and its vapor vanishes when passing the critical point. The piston effect replaces the conductive transfer of heat in the vicinity of solid walls in a 1D configuration.

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