@Article{hmt.12.24,
AUTHOR = {Brenton S. Taft, Kevin W. Irick},
TITLE = {ASETS-II OSCILLATING HEAT PIPE SPACE FLIGHT EXPERIMENT:  THE FIRST SIX MONTHS ON ORBIT},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {12},
YEAR = {2019},
NUMBER = {1},
PAGES = {1--7},
URL = {http://www.techscience.com/fhmt/v12n1/53193},
ISSN = {2151-8629},
ABSTRACT = {On September 7th, 2017 the U.S. Air Force Research Laboratory launched the second Advanced Structurally Embedded Thermal Spreader (ASETSII) flight experiment to space on Orbital Test Vehicle 5. The ASETS-II experiment is made of three low-mass, low-cost oscillating heat pipes (OHPs) 
and an electronics/experiment control box. The three primary science objectives of the experiment are to measure the initial on-orbit thermal 
performance, to measure long duration thermal performance, and to assess any lifetime degradation. The three OHPs on ASETS-II are of varying 
configuration (center heating with single- and double-sided cooling) and working fluids (butane and R-134a) in order to isolate specific performance 
parameters of interest. OHP #3 was specifically designed in order to explore the operating limits on OHP operation in microgravity without requiring 
excessive operating temperature or pressure. Data collected during the first 6 months of on-orbit operations are presented in this paper. It is shown 
that each OHP performed as expected, where on-orbit data for OHPs #1 and #2 mirrored ground-truth performance, and the OHP #3 on-orbit 
maximum operating evaporator temperature increased from ground-truth. The OHPs experienced no significant hysteresis effects and OHP #1 
performed successfully in six-week long continuous operation.},
DOI = {10.5098/hmt.12.24}
}