"Modelling dilute and dense emulsion flows" - January 10, 2025, Friday, 3:00 pm, Pavilhão de Informática III, amphitheatre FA3

Date: January 10, 2025, Friday
Time: 3:00 pm
Place: Pavilhão de Informática III, amphitheatre FA3

• Speaker: Dmitri Eskin (Skoltech - Skolkovo Institute of Science and Technology & University of Alberta)

• Title: "Modelling dilute and dense emulsion flows"

• Abstract:

A model of droplet breakup in a turbulent flow has been developed. The model parameters have been identified from experiments conducted in a laboratory Couette device. This apparatus consists of two coaxial cylinders, the inner of which rotates whereas the outer one is immobile. An engineering model of droplet dispersion (flow + breakup) in a Couette device was developed for parameters’ identification. The droplet breakup model was then incorporated into the STARCCM+ commercial code, and model performance has been demonstrated by computations of emulsion flows in both a Couette device and a horizontal pipe. A model of droplet breakup in a dense emulsion flow has also been developed. This model is based on elements of the kinetic theory of granular media. The corresponding model parameters were also identified from experiments conducted in a laboratory Couette device. The droplet breakup model has been modified for forecasting breakup of a bubble rising in a turbulent flow. An equation for the critical bubble Weber number, accounting for bubble deformation caused by rising, was suggested. The bubble breakup model was also incorporated into the STARCCM+ code. Strong model performance has been demonstrated by comparison of the computational data with the experimental results available for bubbly flows in horizontal pipes.

• Short Biographic Note:

Dr. Dmitri Eskin is an expert in the area of modelling multiphase flows in application to different processes, such as, gas-particle flows, suspension and emulsion flows, gas-liquid flows, microfluidics, particle deposition and turbulent drag reduction. He is currently a Professor at the Center for Petroleum Engineering at Skolkovo Institute of Science and Technology (Skoltech), in Moscow, and an Adjunct Professor at the Department of Chemical and Materials Engineering at the University of Alberta.
Dr. Dmitri Eskin obtained a combined 6-years B.Sc. + M.Sc. degree in Mechanical Engineering from Bauman Moscow State Technical University in 1988 (majoring in Turbomachinery) and a Ph.D. degree in Chemical Engineering from Mendeleyev University of Chemical Technology of Russia in 1993, in the area of jet milling. From 1994 till 1998 Dr. Dmitri Eskin was holding a faculty position at Bryansk State Engineering and Technological University (in Russia). From 1998 to 2005 he was working as a Research Associate at Ben-Gurion University of the Negev (in Israel), University of Calgary, and University of Florida, respectively. In 2005 Dr. Dmitri Eskin joined Schlumberger Technology Corporation as a Senior Development Engineer starting his 13 years-long career at this company. During his Schlumberger journey, Dr. Dmitri Eskin was either involved in or leading numerous projects related to hydraulic fracturing, flow assurance, microfluidics, among others. In 2011 he was awarded with the Advisor status, indicating the highest rank of a Research Scientist at Schlumberger. By the moment of leaving the company, in 2018, in order to take the present academic position, Dr. Dmitri Eskin was holding a position of Scientific Advisor at Schlumberger-Doll Research Center, in Cambridge, Massachusetts.
Dr. Dmitri Eskin is a member of the International Advisory Board of the Canadian Journal of Chemical Engineering and during 10 years was a guest co-editor of the CFD Special Series for the same journal. He was also a member of the Editorial Board of Energies during 4 years. Dr. Dmitri Eskin has authored and co-authored over 100 papers in peer-reviewed journals, and was a co-inventor of 9 patents.

This is another Seminar of the "Seminars@DEM" cycle.
Next Seminar, January 31, 2025, Friday, 3:00 pm.