Tokyo University of Agriculture and Technology

Institute of Global Innovation Research

グローバルイノベーション研究院

公開セミナー

Institute of Global Innovation Research Open Seminar
Thursday,December

13:00~14:00

19 2019

東京農工大学 小金井キャンパス 13号館 講義室 L1331
Lecture Room L1331, Building 13, Koganei Campus TUAT
言語
/ 英語 Language
Language/ English
言語/ 英語/ English“Dynamics of microdroplets in multicomponent liquids”
Dr. Xuehua Zhang , Professor
Department of Chemical and Materials Engineering,
University of Alberta, Canada

Phase separation induced by solvent addition is ubiquitous in many technologic and industrial
processes, from preparation of pharmaceutical products, to formulation of cosmetics and insecticides, toliquid–liquid microextraction. The new microscopic phase formation induced by solvent addition takes
place under the conditions far out-of-equilibrium. The growth dynamics of individual domains isdetermined not only by the concentration of compositions (thermodynamicaspects), but also by the temporal and spatial characteristics of the mixing
process of the solvents (dynamic aspects). We have experimentally andtheoretically investigated the effects from the mixing dynamics on the droplet
formation under controlled flow conditions. A universal femtoliter droplet-based
platform is developed for determination of partition coefficient in water and oil phases and for fast andsensitive nanoextraction of trace of hydrophobic compounds in aqueous solutions. We further
revealed the droplet formation from liquid-liquid phase separation in a quasi-2D chamber.
Remarkably, the droplets exhibit significantly enhanced the mass transfer in confined spaces. Thisfinding may of relevance to the interfacial process during oil extraction from underground by aFigure 1. Splitting droplet at four-phase contact line of solid-air-oil-water. The snapshots show an intriguing phenomenon that follows after the four phasesoil (red), water (green), solid and gas make contact through the coalescence of two different three-phase contact lines. (Yu et al, Soft Matter 2019)14:00~15:00“Ductile fracture probed by tubular specimens under proportional
Dr. Yannis Korkolis, Associate Professor
Department of Integrated Systems Engineering,
The Ohio State University , U.S.A.

Despite many decades of research on ductile fracture challenges remain, especially when considering thepeculiarities of tubular geometry and multiaxial, non-proportional stress states during forming. To assess
the fracture behavior of AA6260-T4 tubes, experiments under axial force and internal pressure without
a die (i.e., free-inflation) were conducted, subjecting the tubes to both proportional andnon-proportional loads and taking them to failure. The results are used to model the plastic anisotropyof the material by two non-quadratic anisotropic yield functions - Yld2000-2D and Yld2004-3D. The
hardening behavior is identified using uniaxial tension tests on strips cut from the axial direction of thetube. Direct measurement of fracture parameters in these experiments isimpossible due to the fracture initiating inside the wall-thickness. Therefore,
the ductile fracture behavior is probed using a hybrid experimental-numericalapproach. To accomplish this, finite element models of the experiments aregenerated. Solid elements are used to probe the local stress and strain fields at the onset of fracture at
the interior of the tube, and thus establish the fracture locus of the material. These elements arecomputationally expensive, so they are used to mesh only the region were fracture is expected tooccur. The rest of the tube is modeled with shell elements, and a surface-based shell-to-solid couplingis used to join the two regions of the finite element model. The same hybrid experimental-numericalapproach is used to probe the path-dependence of the fracture locus.

■共催 / Co-Organized by

小金井キャンパス
Koganei Campus

講演会場 /Venue

東門
East Gate

グローバルイノベーション研究院 エネルギー分野 小笠原チーム
ライフサイエンス分野 田川チーム
Institute of Global Innovation “Energy” Ogasawara Team“Life Science” TagawaTeam
卓越大学院プログラム
Excellent Leader Development for Super Smart Society
by New Industry Creation and Diversity■お問合せ先／Contact
グローバルイノベーション研究院 工学研究院 田川義之
正門
Institute of Global Innovation Research, Institute of Engineering,
Main Gate
Assoc. Prof. Yoshiyuki Tagawa
どなたでも、ご聴講いただけます。
Email: tagawayo (ここに@を入れてください) cc.tuat.ac.jp
Everyone is welcome to attend.
URL: https://www.tuat-global.jp
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Please refer to our website for more information
https://www.tuat-global.jp/english/