Meet the editor

Nicolás O. Rojas obtained his PhD in Physics at the Université de Nice in France. His main research disciplines include nonlinear physics, statistical mechanics, biological physics, fluid dynamics, statistical hydrodynamics, thermodynamics of mixing, lubrication theory, fluid-structure interaction, theory of elasticity, superparamagnetic colloids, finite volumes method and the finite elements method. He has been a postdoctoral fellow in

the Service de Physique de l'État Condensé (SPEC) at CEA Saclay, at the Group for Research and Applications in Statistical Physics (GRASP), Université de Liège, and in the Manchester Centre for Nonlinear Dynamics (MCND) at the University of Manchester. His publications are indexed ISI and in international databases. He has been referee for the Experimental Thermal and Fluid Science, Physics of Fluids and Journal of Fluid Mechanics.

Contents

*by Nicolás O. Rojas*

*by Sebastian Altmeyer*

Based on LBM *by Raoudha Chaabane*

Entropy Generation

*and Sheila A. Bishop*

*by Raoudha Chaabane*

Using LBM

*and Raquel Hernández Gómez*

**Preface III**

**Chapter 1 1**

**Chapter 2 5**

**Chapter 3 41** Equilibrium Structures and Stationary Patterns on Magnetic Colloidal Fluids

**Chapter 4 59**

**Chapter 5 75** Convection Flow of MHD Couple Stress Fluid in Vertical Microchannel with

**Chapter 6 91**

The Study of Magneto-Convection Heat Transfer in a Partially Open Cavity

*by Abiodun A. Opanuga, Olasunmbo O. Agboola, Hilary I. Okagbue* 

Free Convection in a MHD Open Cavity with a Linearly Heated Wall

Introductory Chapter: An Example in Superparamagnetic Colloids

Interaction of Magnetic Fields on Ferrofluidic Taylor-Couette Flow

*by Ricardo Peredo Ortíz, Martin Hernández Contreras* 

## Contents


Preface

This book offers a series of chapters on the topics of magnetic suspensions, statistical mechanics, thermodynamics and computational physics. Authors from countries of four continents: Africa, Europe, North America, and South America published research works derived from their studies. The readers will be confronted with new questions, solutions and answers relative to emerging topics in ferrofluids. This book can be of interest to a large audience: undergraduate and graduate physics students, engineers, scientists , and faculty members wanting to participate in magnetic liquids research. The chapters can be used as complementary material of introductory courses on magnetic mixtures. The selection of articles is suitable for the instruction of engineers and researchers in disciplines relative to magnetic colloids and for readers with technical background. This compilation can be also useful to industrial personnel and technical staff with knowledge in the area of magnetic suspensions. The presented subjects were written to offer a straightforward overview, each chapter goes into deep theoretical rationale, numerical methods and comparison against experimental measurements. The open access feature gives worldwide visibility to the book, scientists can freely acquire the chapters and interact with the available

This book contains six chapters on pattern formation and stability of magnetic colloids. The topics in this book range from investigations on Taylor-Couette flows to research works on couple stress fluid and entropy generation. Analytical methods and numerical algorithms such as the Lattice Boltzmann Method (LBM), spectral decompositions, and differential transformation (DTM) methods are employed. The introductory chapter presents the cohesion energy of superparamagnetic aggregates in a colloidal suspension. The computation is performed up to 4th order employing the distance levels method. The second chapter contains an investigation on the Taylor-Couette ferrofluidic flow. The axial, transverse and oblique applied fields yielding wavy Taylor vortex flows (wTVF) and wavy spirals (wSPI) are described. In the third chapter, the authors report theoretical and numerical findings of structures and dynamical properties of magnetic colloids in thermodynamic equilibrium. A survey of the different models is provided. The fourth and sixth chapters present magneto-convection transfer in linearly and partially open cavities respectively. In both chapters LBM is employed. The fifth chapter is a research work on the convection flow of an MHD couple stress fluid in a vertical microchannel, with findings on the fluid velocity, temperature, entropy generation and Bejan number in the channel. The book offers important information to further develop novel projects in the field

The editor acknowledges the authors of the manuscripts for their scientific contributions. Each chapter was submitted to a rigorous selection process leaving out a great amount of publication proposals. It is a pleasure to thank the editorial

contents.

of magnetic colloids.
