ΤΕΤΑΡΤΗ 2/12/2015 17.00–18.00 :
Δρ . AΝΔΡΕΑΣ ΜΠΟΥΝΤΟΥΒΗΣ, Καθηγητής ΣΧΜ, ΕΜΠ. Τίτλος: «Scaling-up and bridging scales in process engineering»
ΠΕΡΙΛΗΨΗ: Scaling-up in process engineering amounts to connecting parameters/variables with the resultingproduct properties in the framework of a production procedure at a pilot plant-scale. The purpose to be served is to secure product conformity to market/end-user specifications, possibly high-throughput and economic efficiency – oftentimes conflicting objectives.With the advent of computational power and powerful scientific software, process scale-up is effectively carried out at a process simulation level. This entails development of realistic models and employment of sophisticated numerical methods for the computer-aided solution of the associated complicated mathematical problems. The models should incorporate the physics across multiple spatial and/or time scales and account for all the important parameters of the process – ranging from operating, possibly manipulated, such as pressure, temperature and reactor geometry, to transport properties and reaction kinetic schemes. The parameters appear in the equations which are typically statements of the conservation laws of physical quantities – mass, energy and momentum. The process mechanisms are “hiding” in the equations and wait to be revealed by solving the latter and, especially, by examining the effect of the parameters on the solutions. So it is that the computations/experiments relationship is drastically revisited. On one hand, computations are superior in terms of cost and labor savings; on the other, experiments are indispensable in providing input, guidance and validation to the former.A process in point is Chemical Vapor Deposition (CVD), a popular one in the production of thin film coatings, usually for but not restricted to microelectronic applications. CVD is expected to be extensively implemented in aeronautics and space applications in view of new, binding specifications. A robust pathway towards process scale-up will be presented and the analysis will highlight the interplay of the physico-chemical mechanisms involved and the determination of advantageous process operating “windows”. A key feature of the presentation will be the coupling of scales, that of conformal film growth in μm size surface features, which are to be coated, with the macro-scale transport in the bulk of the CVD reactor. This so-called multiscale analysis enables predicting the effect of varying operational “macro”-parame ters of the CVD process on the film growth rate inside micro-features on coated wafers.
ANDREAS G. BOUDOUVIS – SHORT CV:
Andreas G. Boudouvis is a Professor in the School of Chemical Engineering of the National Technical University of Athens (NTUA) and, since March 2013, the Dean of the School. He is the Director of the Computer Center of the School, the Director of the Inter-Departmental Graduate Studies Program “Computational Mechanics” of NTUA and formerly the Head of the Department of Process Analysis and Plant Design of the School of Chemical Engineering.He holds a Diploma from NTUA (1982) and a PhD from the University of Minnesota (1987), both in chemical engineering. He was a Postdoctoral Fellow at the Minnesota Supercomputing Institute (1989-90); Senior Visiting Research Fellow at the Army High Performance Computing Research Center, USA (1991); Visiting Professor at Faculté des Sciences et Technologies, Université de Lorraine, Nancy, France (2012); and Invited Senior Researcher at Ecole Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiques, Toulouse, France (2014). Prof. Boudouvis teaches undergraduate and graduate courses in Transport Phenomena and Computational Methods. His research interests are in: computational transport phenomena; interfacial phenomena and especially electromagnetic effects at fluid interfaces; nonlinear phenomena includinginstabilities and pattern formation; multiscale analysis; large-scale scientific computing. He has co-authored 103 research publications in international journals and over 200 presentations in international and national conferences. He has advised or co-advised 16 doctoral students, 42 students for a Postgraduate Degree and 82 undergraduate students for their Diploma Theses. Among the supervised students, three became recipients of a European Research Council (ERC) Starting Grant: A. G. Papathanasiou (PhD 2000, now Assistant Professor at NTUA) received an ERC grant in 2010; C. Tsogka (Diploma 1995, now Professor at Univ. of Crete) received an ERC grant in 2010; T. Styliannopoulos (Diploma 2003, now Assistant Professor at Univ. of Cyprus) received an ERC grant in 2014.He participated, as principal investigator or main researcher in more than 40 research projects, funded by European and national agencies. He is a member of the Computational Fluid Dynamics Committee of the European Community on Computational Methods in Applied Sciences (ECCOMAS), member of the General Council of the International Association for Computational Mechanics (IACM) and Ex-President of the Greek Association of Computational Mechanics.
