Steady Two-Phase Flow in a Reduced Gravity Environment Portland State University Microgravity Team Albert Sitorus, Michael Bacich, Michael Severson, Jamie Kelso, and Megan Sala
Dec 21, 2015
Steady Two-Phase Flow in a Reduced Gravity Environment
Portland State University Microgravity TeamAlbert Sitorus, Michael Bacich, Michael Severson, Jamie Kelso, and Megan Sala
NASA’s Reduced Gravity Student Flight Opportunities Program
Spring 2002: Notification of Program Summer 2002: Development of 1g test, BenchmarkingOct. 2002: Proposal to NASADec. 2002: Acceptance into the ProgramJan. 2003: TEDP DeadlineMarch 2003: Trip to Johnson Space CenterPresent: Analysis of Results
ApplicationsApplications
• Thermal control systems
• Power cycles• Storage of fuels,
propellants and cryogens
• Life support systems• Waste water
treatment and recycling
• Fluids management
Flow Regimes
Bubbly Slug Annular
http://microgravity.grc.nasa.gov/6712/2phase_flow/2phase.html
Slug Flow
Points of Interest:
• Steady-State Velocities • Deposition Rates• Slug Volumes
Behavior in Reduced Gravity
http://microgravity.grc.nasa.gov/school/gallery.htm
Previous Two Phase Experiments
Rousset B. Two-phase visualization at cryogenic temperature, 2000
Closed Circuit Loop
Terrestrial Design•Simple•Affordable•Small•Achieve Steady-State
Benchmarking
Dimensionless Film Thickness vs. Capillary Number
0
0.5
1
1.5
2
2.5
3
0 0.5 1 1.5 2 2.5 3 3.5 4
Ca (x 10-3)
d /r
(x 1
0-2
)
Closed Circuit LoopChenBretherton
Reduced Gravity Apparatus
Test Equipment Data Package (TEDP)
• Strict Safety Requirements– Structural Analysis
• 9g Forward• 6g Downward • Impact
– Hazard Analysis– Electrical Analysis– Size and Weight
Test FacilityTest Facility
Flight Pattern
Reduced Gravity Flights
Reduced Gravity Experiment
Reduced Gravity Conclusions
-Achieved Steady State
-Design passed Test Readiness Review
-Withstood loading conditions
-Operated successfully
-Experiment size
-Camera Resolution
-Motors and Controllers
Design Changes
Special Recognition
• NASA’s Reduced Gravity Student Opportunity Program
• The Oregon Space Grant Program • Mark Weislogel • Portland State University’s College of
Engineering and Computer Science• FMC Allen Machinery • Chehalem Machine Works• Infinity Images