Keynotes Speakers – JEM 2023

Keynotes Speakers

7th Multiphase Flow Journeys

Prof. Fabio Toshio Kanizawa

State University of Campinas (UNICAMP)

National Invited Lecture – Spatial filter velocimetry – application for external flow across tube bundles

Abstract: This presentation addresses the Spatial Filter Velocimetry technique, which is an interesting alternative for flow velocity measurement. This method is based on the capture of a sequence of images of tracing particles, followed by a post-processing step. The post-processing step corresponds to the application of a digital filter, aiming to mimic fringe lines, and frequency analysis, and can be considered as a computer-based LDV. The method was used for the determination of the flow velocity field during single and two-phase flow across tube bundles using an adaptive meshing scheme. Based on the obtained velocity profile, it was possible to obtain high-resolution results close to the rods’ surfaces, and to evaluate the Reynolds stress tensor components.

Fabio Toshio Kanizawa is currently an assistant professor at the State University of Campinas. Was granted the titles of BSc., MSc., and DSc. at the University of São Paulo, and performed a post-doctoral internship at Kobe University. Has published a book about two-phase flow and heat transfer in microscale channels, as well as several papers. Is interested in the topic of heat transfer during phase change, multiphase flow, thermal systems, and instrumentation for fluid and thermal systems, among others.

Prof. Gherhardt Ribatski

São Carlos School of Engineering – University of São Paulo (USP)

National Invited Lecture – Flow boiling of water and R1336mzz(Z) in asymmetric Dual-V microchannels with tapered manifold

Abstract: Among many existing techniques used to dissipate high heat fluxes, heat sinks based on flow boiling in microchannels enables the dissipation of high heat fluxes with impressive values of heat transfer coefficient inducing negligible temperature gradients along the devices. Over the last decades, many efforts have been made to develop these heat sinks, revealing mechanisms that can be altered to enhance flow boiling heat transfer and contributing to the knowledge on this subject as a way to reveal guidelines that could help in designing arrays of microchannels that are optimized to the desired application, given material, temperature and pressure constraints, for example. In a recent investigation in collaboration with the Thermal Analysis, Microfluidics and Fuel Cells Laboratory (TAμFL) from RIT, led by Prof. Satish Kandlikar, we have presented new heat sinks composed of a bottom surface milled with asymmetric Dual-V microchannels combined with a tapered microgap. The design of this surface follows a mechanistic approach to direct the generated bubbles and organize the flow in preferential liquid and vapor paths, reducing instabilities and improving heat transfer with low values of pressure drop, which was observed in an extensive experimental campaign. Experiments with water enabled the dissipation of 5 MW/m2 and revealed the occurrence of boiling inversion for the first time in flow boiling, while the dissipation of almost 1 MW/m2 was reached in experiments with the refrigerant R1336mzz(Z). Overall, the total pressure drop measured during the experiments was lower than 10 kPa. The obtained results show that novel microstructured surfaces can be rationale engineered in order to benefit from the active physical mechanism during flow boiling.

Dr. Gherhardt Ribatski is Full Professor of Multiphase Flow and Heat Transfer at the São Carlos School of Engineering, University of São Paulo (USP), Brazil. He received his BS, MSc. and Doctoral Degrees in Mechanical Engineering from the University of São Paulo. He held postdoctoral positions at the University of Illinois at Urbana–Champaign, Swiss Federal Institute of Technology in Lausanne (EPFL) and Universidade da Coruña. His research interests cover nanofluids, pool boiling, falling-film evaporation and condensation, two-phase flow, flow induced vibration, flow boiling and condensation for external and internal flows, heat transfer enhancement, heat exchangers, phase-change in microchannels, IR thermography and solar energy. Prof. Ribatski is member of the Congress Committee of International Union of Theoretical and Applied Mechanics (IUTAM) and Brazilian Delegate to the Assembly for International Heat Transfer Conferences. He is member of Assembly of World Conferences on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Virtual Institute of Two-Phase Flow and Heat Transfer, Scientific Council of the International Centre for Heat and Mass Transfer (ICHMT). He was Director Secretary (2016-2017) and President of the Brazilian Society of Mechanical Sciences and Engineering (2018-2021). He has served as coordinator of the CAPES (Coordination for the Improvement of Higher Education Personnel- Brazil) committee for evaluation of graduate programs in the areas of Mechanical, Mechatronics, Naval and Ocean, Aeronautical, Industrial and Petroleum Engineering. He is member of the area panel of Engineering of FAPESP (São Paulo Research Foundation – Brazil) and was Coordinator of the Graduate Program of Mechanical Engineering at São Carlos School of Engineering (EESC) of University of São Paulo (USP) from 2014 to 2019. He is subject (heat transfer) editor of Applied Thermal Engineering, editor of Experimental Thermal and Fluid Science and member of the Advisory Board of International Journal of Multiphase Flow.

He has presented 13 keynote lectures and taken part in the scientific committee of several International Conferences. Dr. Ribatski has over 110 refereed journal publications, 6 book chapters, 1 book and over 120 refereed papers in conferences.

Prof. Carlo Massimo Casciola

Dept. of Mechanical and Aerospace Eng. – Sapienza University of Rome

International Invited Lecture – The nucleation process and its coupling to the macroscale

Abstract: Bubble nucleation is a ubiquitous phenomenon whose prediction proved a formidable task, particularly in the case of water. Here a self-contained model is discussed which is shown able to accurately reproduce data for bulk water over the most extended range of temperatures for which accurate experiments are available [1]. The computations are based on a Ginzburg-Landau model which, as only inputs, requires a reliable equation of state for the bulk free energy and the interfacial tension of the water-vapor system. Rare event techniques borrowed from statistical mechanics allow the determination of the free-energy barrier and the nucleation rate. By consistently including thermal fluctuations [2] in the spirit of Fluctuating Hydrodynamics, the approach is extended to dynamic conditions in presence of solid walls of different wettability [4] to allow coupling with fluid motion [4]. The talk will focus on the wall wettability in compliance with the fluctuation-dissipation balance, a crucial point in the context of the fluctuating hydrodynamics theory. Depending on time availability, new, still unpublished results concerning the coupling of nucleation and fluid flow, the effect of micro-confinement, and time-changing thermodynamic conditions will also be addressed.

References [1] F. Magaletti, M. Gallo, C.M. Casciola, Water cavitation from ambient to high temperatures, Scientific Reports 2021, 11 1. [2] M. Gallo, F. Magaletti, C.M. Casciola, Thermally activated vapor bubble nucleation: the Landau Lifshitz/Van der Waals approach, Phys. Rev. Fluids. 2018, 3, 053604. [3] M. Gallo, F. Magaletti, C.M. Casciola, Heterogeneous bubble nucleation dynamics, Journal of Fluid Mechanics 2021, 906 10. [4] M. Gallo, F. Magaletti, D. Cocco, C.M. Casciola, Nucleation and growth dynamics of vapor bubbles, Journal of Fluid Mechanics 2020, 883.

Carlo Massimo Casciola is presently the Dean of the Faculty of Civil and Industrial Engineering at La Sapienza University of Rome where he leads a research group based at the Mechanical and Aerospace Department working on the dynamics of complex flows and the coupling of macroscopic flows with a microstructure. He has given contributions to turbulence, particulate-, polymers-laden, and multiphase flows, micro/nanofluidics through molecular dynamics simulations and free-energy methods, and mesoscale methods (phase field methods and fluctuating hydrodynamics). He received the prestigious ERC Advanced Grant, BIC – Following Bubbles from Inception to Collapse, and recently developed a novel microfluidic chip to study cavitation-enhanced blood vessel permeability thanks to the ERC Proof of Concept grant INVICTUS, IN VItro Cavitation Through UltraSound.

Prof.ª Panagiota Angeli

ThAMeS Multiphase, Department of Chemical Engineering – UCL

International Invited Lecture – Drop coalescence and the effects of surfactants

Abstract: Dispersions of two immiscible liquids find numerous applications in the energy and manufacturing sectors, including transportation of multiphase mixtures, enhanced oil recovery, pharmaceutical and healthcare formulations, food and agrochemicals. One of the main phenomena that define the droplet size in the dispersion is coalescence. Surfactants are often naturally present in the fluids or added during processing to vary the interfacial properties, control the drop size, stabilise the dispersions and influence the final product rheology. This talk will discuss coalescence studies of drops with liquid-liquid interfaces and the effects of surfactants. Experiments have considered two- and three- dimensional configurations for a wide range of liquid properties which resulted in both full and partial drop coalescence. Surfactants were found to reduce the partial coalescence region in the Ohnesorge-Bond map. Velocity fields during coalescence were studied with high-speed particle image velocimetry while the distribution of fluorescent surfactants at the coalescing interfaces was investigated with planar laser-induced fluorescence. A novel configuration has been developed to investigate the delayed coalescence of drops with moving interfaces, which is very relevant to continuous separators and to flow processing of dispersions.

Prof.ª Panagiota Angeli, FIChemE, is a Professor in the Department of Chemical Engineering at UCL, Deputy Head ED&I, and leads the ThAMeS Multiphase group. She obtained a Diploma in Chemical Engineering from the National Technical University of Athens and a PhD on Multiphase Flows at Imperial College London. She specializes on complex multiphase flows particularly those involving two liquid phases. Her research aims to link small scale interactions and interfacial phenomena to the macroscopic behaviour of the complex flows and to the development of predictive models. She has been investigating the effects of surfactants, particles and non-Newtonian rheologies on microchannel drop formation and on coalescence, as well as their applications to the analysis and intensification of metal separations, and to the manufacturing of complex formulations. The experimental investigations have been enabled by original and advanced sensing and measurement techniques, such as micro- and high speed Particle Image Velocimetry (PIV) and ultrasound. Prof Angeli’s work has been supported by substantial UK Research Council and European Union grants and by industry. She has been awarded a RAEng/Leverhulme Trust Fellowship, and has participated and chaired UK EPSRC and international (Norway, Sweden, Ireland, Belgium) research funding review panels. She co-chairs the Multiphase Flows Special Interest Group of the EPSRC funded UK Fluids Network and has published about 200 journal papers.

Prof. Su Jian

Programa de Engenharia Nuclear – COPPE/UFRJ

Short course – Introdução à Modelagem de Escoamento Bifásico Gás-Líquido

Abstract: Serão apresentados conceitos básicos de regimes de escoamento bifásico gás-líquido e os principais parâmetros de escoamento bifásico, além das formulações do modelo homogêneo-equilíbrio (HEM) e do modelo de dois fluídos (TFM) para escoamento bifásico unidimensional transiente. Também serão apresentados modelos fenomenológicos para escoamento estratificado horizontal e ligeiramente inclinado, escoamento anular vertical, escoamento pistonado horizontal e escoamento pistonado vertical.

Professor Su Jian é Professor Titular do Programa de Engenharia Nuclear da COPPE/UFRJ, bolsista de produtividade em pesquisa 1B do CNPq e Cientista do Nosso Estado da FAPERJ. Ele é formado em Engenharia Termofísica pela Universidade de Ciência e Tecnologia da China (USTC), obteve o mestrado em Engenharia Termofísica na Academia Chinesa de Ciências e o doutorado em Engenharia Mecânica na COPPE/UFRJ. Foi professor visitante em várias universidades estrangeiras, como o Imperial College London, McMaster University, University of Hong Kong e Peking University. Coordenou diversos projetos de pesquisa financiados pelo CNPq, CAPES, FAPERJ e ANP, além de projetos de prestação de serviço para empresas de mineração. Atua nas áreas de fenômenos de transporte, escoamento multifásico, termo-hidráulica de reatores nucleares, interação fluido-estrutura e avaliação de segurança radiológica de resíduos de mineração.

Prof. Igor B. de Paula

Departamento de Engenharia Mecânica PUC-Rio

Short course – Optical techniques for measurements in gas-liquid flows

Abstract: This short course reviews the most used techniques for measurements in gas-liquid flows. Basic concepts of flow visualization and image processing are discussed in the context of two-phase flow measurements. Finally, some experimental results are shown to illustrate the application of the methods.

Igor B. de Paula holds a degree in Mechatronic Engineering from the Pontifical Catholic University of Minas Gerais (2002) and a doctorate (2007) in Aeronautical Engineering from USP-EESCP with a sandwich period at Stuttgart Universität, Germany. From 2007 to 2011, he worked as a researcher at the Laminar Wind Kannal (LWK) in Stuttgart. From 2011 to 2014, he worked as a post-doc in the Department of Mechanical Engineering at PUC-Rio. Since 2014 he has been an adjunct professor at the Mechanical Engineering Department of the Pontifical Catholic University of Rio de Janeiro (PUC-Rio).  He teaches undergraduate and graduate students at PUC-Rio about experimental methods in fluid mechanics, hydrodynamic stability, signal processing and electronics for instrumentation. Prof. De Paula has experience in hydrodynamic stability applied to single and two-phase flows and developing optical flow measurement methods. His works have recently focused on the simultaneous measurement of flow fields of two-phase flows in pipes using Particle Image Velocimetry, Shadowgraphy and controlled disturbances.

Bayode Owolabi

Interdisciplinary Centre for Fluid Dynamics (NIDF) – UFRJ

Short course – Experimental methods for multiphase flow studies: state-of-the-art and current challenges

Abstract:  Multiphase flows are fascinating, ubiquitous and equally challenging. A fundamental physical understanding of such flows is therefore very important for making predictions about various processes. Experiments play a key role in this regard and are instrumental to the formulation of models/correlations  which can be used in numerical simulations. In this short course, the currently available experimental tools will be introduced and their guiding principles discussed. A list of challenges currently being faced in the implementation of these methods will also be pointed out and pathways for future developments will be discussed.

Bayode Owolabi is a postdoctoral researcher at the Interdisciplinary Centre for Fluid Dynamics (NIDF), UFRJ. He completed a bachelor’s degree in Mechanical Engineering at the Federal University of Technology Akure Nigeria in 2010, after which he was awarded a Commonwealth scholarship for a master’s degree in Energy Generation at the University of Liverpool.  In 2015, Bayode was enrolled on the dual PhD programme between the University of Liverpool and National Tsing Hua University Taiwan, and successfully defended his thesis in December 2018.  Since then he has worked as a researcher at the University of Alberta in Canada and a lecturer at the Federal University of Technology Akure, before coming to Brazil.  His research interests include wall-bounded turbulent flows, transition to turbulence, polymer drag reduction, rheology and particle-laden flows.

Prof. Luiz Fernando Lopes R. Silva

Chemical Engineering School, Federal University of Rio de Janeiro – UFRJ

Short course – Disperse multiphase flow modelling approaches

Abstract: A detailed analysis of regime flow maps reveals the complexity of multiphase flows. Indeed, choosing a proper modelling approach for multiphase flow systems is directly linked to the flow regime. This course will analyse different modelling approaches in dispersed flows according to the map flow regime. We will discuss the Lagrangian and Eulerian approaches and their equations, forces and aspects of particle interactions. In conclusion, the participants will improve their ability to interpret the physical situation of a given problem and be able to decide on the best model options for multiphase flow in fluid dynamic simulation programs,

Dr. Luiz Fernando Lopes Rodrigues Silva holds a bachelor’s and postgraduate degree in Chemical Engineering from UFRJ, completing his doctorate in 2008. His thesis entitled “Development of methodologies to simulate polydisperse flows using open source code” was the first to use the package CFD OpenFOAM in Brazil. Luiz Fernando is an associate professor at Escola de Química/UFRJ and keeps teaching and research activities in several transport phenomena and computational fluid dynamics fields, such as multiphase processes, heat and mass transport and industrial separation systems.

Prof. Gustavo Rabello Dos Anjos


Short course – Modeling of Deformable Interface in Two-Phase Systems

Abstract: In this short course, an overview of classical to modern methods used for modeling interface deformation in two-phase systems will be presented. Methods such as Volume-of-Fluid (VOF), Level-Set (LS), and moving mesh type (ALE-FEM) will be presented, as well as a discussion of their differences. Bubble dynamic animations will be presented.

Gustavo Rabello Dos Anjos was born in Rio de Janeiro in 1980. My research field is the numerical simulation on single- and two-phase flows. During my doctoral studies, I’d been working on the discretization of fluid motion equations and the modeling of interfacial forces through the Finite Element Method. The developed in-house numerical code has been designed by modern and flexible object-oriented languages: (C++) and (Python) which allowed easy maintenance and further development. My Ph.D. thesis was selected to be among the 5-10% of best thesis written at EPFL in 2012. From Aug. 2012 to Aug. 2013 I worked as a Post-Doc Associated in the Nuclear Science & Engineering (NSE) at the Massachusetts Institute of Technology (MIT) in Cambridge/Boston. The goal of the Post-Doc position was to benchmark the boiling/condensation experimental database using a commercial front-capturing code available in the MIT group. In Sep. 2013, I finally returned to Brazil as Post-Doc assistant sponsored by the Brazilian agency CAPES/Science Without Borders – Young Talent Fellowship. In 2014 I became a young Mechanical Engineering professor at the State University of Rio de Janeiro (UERJ). In 2019 I’ve started a professorship position at the Federal University of Rio de Janeiro (UFRJ). I’m a member of the graduate school of Mechanical Engineering at (COPPE), Young Researcher of the State of Rio de Janeiro (FAPERJ), and currently awarded Royal Society-Newton Advanced Fellowship.

Prof. Eduardo Nunes dos Santos

Graduate Program in Energy Systems (PPGSE/UTFPR)

Short courseSensors and Instrumentation for multiphase flow monitoring

Abstract: Developing techniques for multiphase flow investigation has been a significant challenge due to the complex nature of the phenomena. However, multiphase flow meters have become increasingly accurate and reliable with technological advances, including more sophisticated sensor technologies and data processing techniques. With the recent advances in the Industrial Internet of Things, it is possible to perform real-time monitoring and control of flow conditions. In a distributed context, devices can collect data from multiple sensors in different parts of the flow system and transmit this data to a hybrid system, combining physics-based and data-driven models. This approach can improve the accuracy of multiphase flow measurements and rapid detection of undesirable phenomena such as hydrates formation, and also prevent equipment failures and ensure safe operation.

Eduardo Nunes dos Santos is Professor of the electronics department (DAELN/UTFPR) and in the Graduate Program in Energy Systems (PPGSE/UTFPR). Computer engineer with a master’s and doctorate in Electrical Engineering with expertise in Automation and Systems Engineering. Worked as a researcher at the Helmoltz-Zentrum Dresden-Rossendorf, developing sensing techniques for multiphase flow. Co-founder of a technology-based startup (Specrux) and Multiphase Flow Research Center (NUEM/UTFPR) member, which has more than ten years of experience in R&D projects with companies in the oil and gas sector, working mainly in the following areas: Embedded systems, Instrumentation, and real-time sensors for monitoring industrial processes.