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will show how simple microfluidic platforms can be used Track 12: Micro-and Nano-Systems
to solve complex biological problems with an emphasis on
mechanical engineering approaches. The presentation will
explore a few of our recently developed technologies, in
particular, human sperm trapping and sorting for fertility
treatment using inertial microfluidics with non-Newtonian fluids,
pathogen detection from food using complex microfluidic
devices, and fast polymerase chain reaction (PCR) chips for
rapid personal and medical analysis that take advantage of
microfluidic scaling laws. A few of our recent medical device
projects will also be highlighted, including a vascular coupling
device and a nerve regeneration device.
Bio: Bruce K. Gale received his undergraduate degree in
Mechanical Engineering from Brigham Young University in
1995 and his Ph.D. in Bioengineering from the University of
Utah in 2000. He was an assistant professor of Biomedical
Engineering at Louisiana Tech University before returning
to the University of Utah in 2001, where he is now Chair
and a professor of Mechanical Engineering. He is currently
Director of the Utah State Center of Excellence for
Biomedical Microfluidics, a center devoted to research and
commercialization activities around microfluidic devices.
His primary interests include solving medical, biology, and
chemistry problems using a variety of microfluidic approaches
to complet complex and challenging medical and biological
assays. Specifically, he is working to develop a microfluidic
toolbox and approaches for the rapid design, simulation, and
fabrication of devices with medical and biological applications. explored for decades. However, none has been widely
The ultimate goal is to develop platforms for personalized
medicine, which should allow medical treatments to be
customized to the needs of individual patients. As an
outgrowth of his work, five companies have been formed
and he maintains a role at each. The first is Carterra, a
multiplexed instrument development company focused on
protein characterization in the pharmaceutical industry that
was spun out of his lab in 2005. The others include: Espira,
which focuses on pathogen detection and exosome
separations; Nanonc, which focuses on reproductive
medicine applications of microfluidics; wFluidx, which
focuses on genotyping zebrafish embryos; and Microsurgical
Innovations, which focuses on miniature medical devices.
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Engineering and Packaging
12-2-2: MICRO-AND NANO-SYSTEMS ENGINEERING
AND PACKAGING
Wednesday, November 13, 9:45AM–10:30AM
Room 255B,
Calvin L. Rampton Salt Palace Convention Center
Drag Reduction of Watercraft: Microfluidics Applied to
Macroscale Objects
(IMECE2019-14009)
Chang-Jin “CJ” Kim
University of California, Los Angeles
Abstract: When an object (e.g., boat) moves in a liquid
(e.g., water), drag impedes its motion, consuming energy and
limiting speed. Since maritime transportation alone accounts
for a significant portion of the global oil consumption and
greenhouse gas generation, a reduction of the water drag by
even a small fraction would have a considerable benefit
worldwide. Because the skin friction drag is the largest portion
of the total drag experienced by most water vehicles,
numerous mechanisms to reduce the skin friction have been
accepted because of poor energy efficiency. About a decade
ago, superhydrophobic (SHPo) surfaces started to receive
significant attention because the air layer between water and
the surface can lubricate the water flows, decreasing the skin
friction. Unlike other existing gas-lubricating methods, SHPo
surfaces would hold a gas layer (called plastron) within the
microscopic structures on the surface, making it possible
to reduce skin friction without consuming energy to provide the
gas. Despite two decades of research, however, drag reduction
with SHPo surfaces has not been obtained for the most
coveted application example, i.e., high Reynolds number flows
in open water. This talk will present our recent achievement,
i.e., the first successful large drag reductions (~30%, up to
~40%) with SHPo surfaces using credit-card-size samples
tested under a boat on the sea at Reynolds number as high
as 1.14 × 107 (friction Reynolds number as high as 5800).
The results attest the importance of microscopic nuances of
SHPo surfaces for a given application even if it is of macroscale,
suggesting directions for other future goals as well.
Bio: Professor Chang-Jin “CJ” Kim received his B.S. from
Seoul National University, M.S. from Iowa State University,
and Ph.D. from the University of California, Berkeley, all in
mechanical engineering, and joined the faculty at UCLA in
1993. Holding the Distinguished Professor title and the
Volgenau Endowed Chair in Engineering, he directs the Micro
and Nano Manufacturing Lab to perform research in MEMS
and Nanotechnology, including design and fabrication of
micro/nano structures, actuators, and systems, with a focus
on the use of surface tension. The recipient of the Research
Excellence Award (Iowa State University), TRW Outstanding
Young Teacher Award (UCLA), NSF CAREER Award,