International Conference on Nanochannels, Microchannels,
and Minichannels

Sheraton Dubrovnik Riviera Hotel, Dubrovnik, Croatia

June 10-13, 2018

Speakers - Plenary Speakers


Daniel Attinger

Daniel Attinger, Iowa State University
Title: Shaving off some complexities of pool boiling with Occam’s razor

Abstract: Late medieval scholar William of Occam formulated the law of parsimony, which states that a theory should not be more complex than necessary. Similarly, the best engineering designs are often the simplest. On the other hand, pool boiling is antithetic to simplicity. It is transient, multiphase and multiscale. Twenty dimensionless numbers are not enough to characterize on current multiscale heater surfaces; and classical boiling theory was developed at a time when experimental refutation or validation was challenging. This lecture will discuss opportunities to apply Occam’s simplifying razor to pool boiling, specifically to the related theory, simulation and device design. Examples from my body of work and from the ICNMM community will be showcased, including simplified representation of interfacial measurements, discrete rather than continuum simulations, and heaters with surface properties that are either spatially non-uniform or adaptive to the boiling regime.

Bio: Attinger is an Associate Professor in the Mechanical Engineering Department at Iowa State University. His scholarship is in thermofluids and complex fluids, with applications in energy technologies and bloodstain pattern analysis. He has co-authored more than 80 peer-reviewed articles, edited four books, and written several book chapters and critical reviews. He has given ten keynote lectures at international conferences, and 80 invited talks in the Americas, Asia and Europe. He is the recipient of a 2001 medal for outstanding Ph.D. thesis at ETH Zurich, a US National Science Foundation CAREER award, the 2012 ASME ICNMM Outstanding Researcher Award, the 2014 Professor of the Year award in his Department, and a 2016 JSPE Research Fellowship. He is the co-inventor of four US and international patents and a Fellow of the ASME.

Srinivas Garimella

Srinivas Garimella, Georgia Tech
Title: Microscale Phase-Change to Enable a Wide Range of Thermal Systems

Abstract: In the nano-micro-mini channel research community, the overwhelming focus is on applications such as electronics cooling, lab-on-a-chip and bio-mems, typically for miniature devices. However, microscale phase-change can benefit a much wider range of applications, even to Megawatt scales. This presentation will demonstrate the use of insights into coupled microscale phase-change heat and mass transfer to enable a diverse array of thermally driven HVAC&R, carbon capture, and natural gas cleaning systems. Miniaturization through integration of multiple microscale components into compact, monolithic systems enables the replacement of multiple devices such as conventional air-conditioners, furnaces and water heaters by a single modular thermal hub driven by natural gas or low-grade waste heat. Such microscale phase-change enabled systems are also applied to waste heat driven cooling systems in naval bases, and aircraft carriers at the Megawatt scale. Fast heat and mass transfer kinetics in hollow microchannel fibers with internal coupling fluid flow and loaded externally with adsorbents can also be exploited to enable rapid temperature swing adsorption (RTSA) for CO2 capture from power plants. A heat recovery technique using a thermal wave technique is developed to minimize external heat input for CO2 capture. The resulting RTSA cycle implemented in a 750 MW coal power plant is shown to require the lowest parasitic load on the power plant compared to existing capture technologies. Such adsorbent-coated hollow fibers are also shown to yield several-fold plant footprint reductions in natural gas purification plants. Pressure swing adsorption (PSA) and temperature swing adsorption techniques employing microchannels yield up to 20-25 fold increase in the processing capacity at competitive gas purities and recoveries compared with conventional packed-bed designs. Further performance enhancement is achieved with working fluid gases and heat transfer fluids (HTFs) flowing through the same adsorbent-coated channel alternately, thereby eliminating complex header designs. Interaction of working fluid gases and liquid HTFs with the adsorbent in these common microchannels is predicted based on models and experiments on displacement phenomena in plug, annular and rivulet flow regimes in microchannels. A complete process model validated by mass spectrometry based experiments for heat and mass transfer in the individual stages of the purification cycle predicts a 100-fold increase in throughput and four times less volume compared with conventional designs.

Bio: Dr. Srinivas Garimella is the Hightower Chair in Engineering and Director of the Sustainable Thermal Systems Laboratory at Georgia Institute of Technology. He received M. S. and Ph.D. degrees from The Ohio State University, and a Bachelor’s degree from the Indian Institute of Technology, Kanpur. He has held prior positions as Research Scientist at Battelle Memorial Institute, Senior Engineer at General Motors Corp., and Associate Professor at Western Michigan University and Iowa State University. He is a Fellow of the ASME, past Associate Editor of the ASME J. Heat Transfer, and Editor of the Int. J. Air-conditioning and Refrigeration. He has also served as Associate Editor of the ASME J Energy Resources Technology, and Past Chair of the Advanced Energy Systems Division of ASME. He was an Associate Editor of the ASHRAE HVAC&R Research Journal and was on the ASHRAE Research Administration Committee. He held the William and Virginia Binger Associate Professorship of Mechanical Engineering at ISU from 1999-2001. He has mentored over 75 postdoctoral researchers, research engineers and students pursuing their M.S. and Ph.D. degrees, with his research resulting in over 250 archival journal and conference publications, a textbook on Heat Transfer and Fluid Flow in Minichannels and Microchannels (2nd Ed., Elsevier 2014), and a book on Condensation Heat Transfer (World Scientific Publishing, 2015.) He has been awarded eight patents. He is the recipient of the NSF CAREER Award (1999), the ASHRAE New Investigator Award (1998), the SAE Ralph E. Teetor Educational Award for Engineering Educators (1998), and was the Iowa State University Miller Faculty Fellow (1999-2000) and Woodruff Faculty Fellow (2003-2008) at Georgia Tech. He received the ASME Award for Outstanding Research Contributions in the Field of Two-Phase Flow and Condensation in Microchannels, 2012. He also received the Thomas French Distinguished Educator Achievement Award (2008) from The Ohio State University, and the Zeigler Outstanding Educator Award (2012) at Georgia Tech.

Ho-Young Kim

Ho-Young Kim, Seoul National University
Title: Capillary flows in 2D and 3D porous media

Abstract: The capillary imbibition of liquids in porous media takes place on length scales spanning several orders of magnitude, in phenomena ranging from landslide due to heavy rainfall in geophysics to stiction of nanopatterns in semiconductor manufacturing. Although the laws of Lucas-Washburn or Darcy are generally known to explain the flow dynamics driven by capillarity and resisted by viscosity, a rich variants of the problem have been tackled recently. Here we introduce some of the recent advances in our understanding of wicking dynamics in two- and threedimensional porous media. As 2D flows, we consider hemiwicking that occurs on microdecorated hydrophilic surfaces. The velocities of both seemingly straight macroscopic wetting front and zippering microscopic front are analyzed and experimentally corroborated. As 3D flows, capillary rise in cellulose sponges with heterogeneous pore size distribution is treated, where a liquid flows along the corners of macro voids driven by capillary pressure of microscale wall pores.

Bio: Ho-Young Kim is Professor at the Department of Mechanical and Aerospace Engineering, Seoul National University, Korea. He received his B.S. degree from Seoul National University, and M.S. and Ph.D. degrees from MIT. He was a post-doctoral fellow at Harvard University in 2004 and a Wyss Visiting Fellow at the Wyss Institute at Harvard University in 2011-2012. He is Fellow of American Physical Society since 2017. His research activities center around soft matter physics, microscale and biological fluid dynamics with applications to soft robotics, lab-on-a-chip, semiconductor manufacturing, etc.

Guangsheng Luo

Guangsheng Luo, Tsinghua University
Title: Microchemical systems for multiphase chemical reactions

Abstract: Microchemical systems provide promising prospects for the development of green and low-carbon chemical industries. The excellent performance in process control, safety issues, mass and heat transfer, energy and mass consumption, and scaling up open new windows for chemical reaction processes. The development and achievements of microchemical systems for chemical reaction processes in the last decade are very exciting. New measurement techniques and chemical reaction process intensification based on microchemical systems have been well developed, some technologies have even been successfully applied in industrial processes. The research group of microchemcial technology at Tsinghua University has begun to develop new microchemical systems and microchemical technologies since 1990s. In this presentation, the new developments in microchemical systems for several typical chemical reaction processes will be introduced, such as liquid/liquid microflow for fast chemical reactions, gas/liquid microflows for CO2 capture. The applications of the developed microchemical systems in industrial processes will also be briefly mentioned. Finally, future research opportunities in this area will be discussed.

Bio: Prof. Guangsheng Luo received his Ph.D. and B.Sc. degrees in 1993 and 1988, respectively, both from Tsinghua University. His research interests include microstructured chemical systems, separation science and technology, transfer phenomena, and functional materials. He has published more than 300 papers in peer-reviewed journals and holds more than 60 patents. He was awarded the National Science Fund for Distinguished Young Scholars in 2005. He won the second prize of China State Technological Invention Award in 2012. He was admitted as a Fellow of the Royal Society of Chemistry in 2016.

Sumita Pennathur

Sumita Pennathur, University of California Santa Barbara
Title: Nanofluidic Electrokinetic Systems

Abstract: Electrokinetic flow within nanofluidic systems allows for exquisite measurement and control of analytes. We have previously uncovered mechanisms with which to concentrate, separate, and manipulate individual analytes based on electrokinetic phenomenon. Specifically, the electric double layer at the solid-liquid interface can be sufficient to produce non-intuitive transport behavior. Nanochannels with finite double layers allow for systems where the conductivity within the nanochannel can be precisely measured and manipulated. We exploit these nanofluidic systems as robust platforms to study of the behavior of biomolecules under confinement, including the transport and kinetics of proteins and/or DNA. We have also developed unique bioanalytical devices relating conductivity changes in solution to quantitative information about the presence of analytes and thus created cheap, disposable, real-time sensors in a small nanofluidic-based chip. Our latest research aims to further translate these research findings to develop not only in vitro diagnostic devices, but also on-body and implantable multi-analyte sensors.

Bio: Dr. Pennathur is a full Professor of Mechanical Engineering at the University of California Santa Barbara, with degrees from Stanford (PhD) and MIT (MS, BS).Since arriving at UCSB, Pennathur has contributed significantly to the fields of nanofluidics and interfacial science. She has performed pioneering work in both theoretical and experimental characterization of fluid flow in MEMS and NEMS devices. These contributions have been disseminated in the form of over 60 archived journal publications, books or conference papers, 6 patent applications, and more than 80 invited presentations. Notable awards include the DARPA Young Faculty Award (2008), the UC Regents Junior Faculty Fellowship (2009), the PECASE (Presidential Early Career Award in Science and Engineering) award (2010), the Santa Barbara Chamber of Commerce Innovator of the Quarter Award (2012), and the ADA Pathway to Stop Diabetes Visionary Award (2017). Her work has led her to found two companies - Alveo Technologies and more recently Laxmi Therapeutic Devices where she is currently CEO.

John Rose

John Rose, Queen Mary University of London
Title: Personal reflections on recent dropwise condensation investigations

Abstract: Recent developments in dropwise condensation and interphase matter transfer have prompted me to revisit issues discussed in my keynote presentation entitled “Interphase matter transfer, the condensation coefficient and dropwise condensation” at the 1998 International Heat Transfer Conference in Korea. I have been encouraged by the resurgence of interest in this area. This has been mostly devoted to “micro/nano structured” surfaces which can exhibit very large contact angles and which have been claimed to have heat transfer advantages over smooth surfaces. There have also been a number of molecular dynamic computational investigations of the vapor-condensate interface where, according to earlier kinetic theory studies of evaporation and condensation, an abrupt temperature drop occurs which is significant in dropwise condensation theory. These investigations and their relevance and importance in dropwise condensation heat transfer are discussed.

Bio: John Rose has been full Professor at Queen Mary, University of London since 1985, serving as Head of the Department of Mechanical Engineering 1991-1995. He is a Fellow of the UK Institution of Mechanical Engineers and of the American Society of Mechanical Engineers. He is a member of the UK Heat Transfer Committee and of the UK Heat Transfer Society of which he was president for 2007/08. His teaching interests are in the fields of thermodynamics, fluid mechanics and heat transfer. He has held sabbatical appointments at MIT, US Naval Postgraduate School and the Universities of Tokyo and Kyushu. His research interests are mainly in the field of condensation heat transfer in which he has published some 300 theoretical and experimental papers. He is UK editor of International Journal of Heat and Mass Transfer, International Communications in Heat and Mass Transfer, Experimental Heat Transfer and serves on the advisory boards of several other journals.