Page 36 - ASME IMECE 2015 Program

Track Plenary

Sciences, and several national laboratories in areas related to nuclear motion, consistent with numerical modeling [2].
safety, probabilistic risk assessment, probabilistic fracture mechanics, and
physics of failure. Dr. Modarres has over 300 papers in archival journals A number of simple fluid observations were made. Oscillations were
and conference proceedings. He has published a number of textbooks, observed in an 18 centimeter water sphere (about the size of my head)
edited books and book chapters in various areas of nuclear safety, risk, driven by a pulse of air. As the sphere diameter became large, the ratio of
and reliability engineering. He is a University of Maryland Distinguished surface tension to inertial force decreased, resulting in dynamics not seen
Scholar-Teacher and a fellow of the American Nuclear Society. Dr. in spheres of 5 centimeters or less. Heterogeneous bubble nucleation,
Modarres’ interests in reliability, integrity, prognosis, and health manage- driven by chemical reaction at a solid surface (effervescent antacid tablet),
ment of structures include experimental and model development activities produced bubble dynamics where newly formed bubbles received
for assessment of the health and remaining useful life of structures. He has momentum from the wall and moved into the bulk fluid coalescing into
been extensively involved with probabilistic physics of failure model large gas pockets. A methyl cellulose solution, a viscoelastic fluid, clearly
development for fatigue, creep, pitting corrosion, corrosion-fatigue, demonstrated the viscous properties of a liquid and the elastic properties
neutron embrittlement, and stress corrosion cracking of various metals. of a solid with a delayed (>2 minutes) onset of the Rayleigh column instabil-
His research interests also include assessment of cable failures due to fire ity. The real-time dynamics of die swell, often masked by gravitational
hazards in advanced nuclear power plants; fatigue and corrosion based force, was clearly visible where the time constant for die swell onset and
degradation assessment of nuclear reactor vessels and piping of nuclear the rate of die swell progress was measured [3].
power plants; best estimate thermal-hydraulic analyses of reactor
There will be many questions presented and few answers; which of course
transients to account for variability and uncertainties; risk and perfor-
is a characteristic of being on a frontier and why we venture there.
mance-based maintenance.
1. Elele, E. O, et.al., Detection of a dynamic cone-shaped meniscus on the
surface of fluids in electric fields, Phys. Rev. Lett., vol. 114, 054501, (2015);
Track 9: Fluids Engineering Systems & Technologies doi: 10.1103/PhysRevLett.114.054501.
SESSION 9-3-1: ELECTRIC AND THERMAL PHENOMENA IN
MICROGRAVITY ON THE INTERNATIONAL SPACE STATION 2. Yamamoto, T., et.al., Numerical investigation for the effect of the liquid
Tuesday, November 17, 10:30am–12:00pm film volume on thermocapillary flow direction in a thin circular liquid film,
370B, Convention Center Phys. Fluids, vol. 25, 082108 (2013); doi: 10.1063/1.4818160.
Some Observations of Fluid Static Charging, Marangoni Convection, 3. Pettit, D. R., Exploring the frontier: Science of opportunity on the
and Non-Newtonian Fluid Dynamics in Microgravity on the Internation- international space station, Proc. Am. Philo. Soc., vol. 153, no. 4, pp.
al Space Station 381–402, Dec. 2009.
(IMECE2015-52070)
Donald Pettit
NASA Johnson Space Center Track 10: Heat Transfer and Thermal Engineering
SESSION 10-44-1: TRENDS IN PROCESS HEAT TRANSFER
Abstract: Frontiers are interesting places; they offer the possibility to make Wednesday, November 18, 10:30am–12:00pm
observations outside our normal range of experience. The International 362D, Convention Center
Space Station is such a frontier offering a local reduction in acceleration
Trends in Process Heat Transfer
force by nearly a factor of a million thus allowing the observation of subtle
(IMECE2015-54217)
phenomena that are typically masked on Earth. Observations on charged
fluid and Marangoni convection will be presented along with examples of Thomas G. Lestina
Newtonian and non-Newtonian fluid behavior. Heat Transfer Research, Inc.

A belt and rollers Van de Graff generator was built during Expedition 30 to Abstract: Thermal design practices for heat exchangers in the process
the International Space Station from leftover LEGO parts and driven by a industries have evolved over many decades. Generational trends often
battery-powered drill driver. This Van de Graff generator was capable of can be observed in mature facilities where replacement of exchangers is
producing about 150 KV based on 80–90 millimeter spark lengths and staged over time, creating a wide variety of design bases. Facilitated by
was used to charge deionized water forcing it into a number of well-known improvements in design tools—including more accurate correlations, more
dynamic behaviors such as Taylor cones but on a length scale of 5 effective analysis methods, and powerful, robust software, all fueled by
centimeters, about 100 times greater than is possible on Earth [1]. research advances—this evolution will continue as many projects demand
higher accuracy of predicted performance to meet production require-
Marangoni convection was driven in thin deionized water sheets, 50
ments. To accurately predict beginning-of-run (BOR), middle-of-run (MOR),
millimeters in diameter, 200–1200 micrometers thick supported by a
and end-of-run (EOR) performance, fouling prediction and mitigation
wire loop, thus presenting two free surfaces to observe two-dimension-
measures are often desired. Additional research into fouling is warranted
al fluid motion. Localized heat from a soldering iron was used to drive
to address this need. To reduce design uncertainty, operating data are
Marangoni convection and fluid motion observed using tracer particles. now used as the basis for design of replacement exchangers at some
36 If the water sheet surface geometry changed from slightly concave to
facilities. This approach allows for selection and sizing of exchangers with
convex, a direction shift of 180 degrees was observed in the fluid
smaller design margins and more efficient use of pressure drop. However,