Introducing SE-FIT: Surface Evolver - Fluid Interface Tool for Studying Capillary Surfaces

Chen, Yongkang; Schaeffer, Ben; Weislogel, Mark; Zimmerli, Gregory A.

doi:10.2514/6.2011-1319

Cited by 17 publications

(11 citation statements)

References 11 publications

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“…Average static non-wetting contact angles are measured by comparing profile images of drops of known volume to numerically computed droplet shapes of the same volume. The Surface Evolver algorithm of Brakke (1992) is employed via the SE-FIT graphical user interface (Chen et al, 2011). The contact angle θ is varied in the computations until the interface profile error with the experiment images is minimized.…”

Section: B Measurement Of Contact Angle θ and Roll-off Angle αmentioning

confidence: 99%

Puddle jumping: Spontaneous ejection of large liquid droplets from hydrophobic surfaces during drop tower tests

et al. 2016

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Large droplets and puddles jump spontaneously from sufficiently hydrophobic surfaces during routine drop tower tests. The simple low-cost passive mechanism can in turn be used as an experimental device to investigate dynamic droplet phenomena for drops up to 104 times larger than their normal terrestrial counterparts. We provide and/or confirm quick and qualitative design guides for such “drop shooters” as employed in drop tower tests including relationships to predict droplet ejection durations and velocities as functions of drop volume, surface texture, surface contour, wettability pattern, and fluid properties including contact angle. The latter is determined via profile image comparisons with numerical equilibrium interface computations. Water drop volumes of 0.04–400 ml at ejection speeds of −0.007–0.12 m/s are demonstrated herein. A sample application of the drop jump method is made to the classic problem of low-gravity phase change heat transfer for large impinging drops. Many other candidate problems might be identified by the reader.

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Section: B Measurement Of Contact Angle θ and Roll-off Angle αmentioning

confidence: 99%

Puddle jumping: Spontaneous ejection of large liquid droplets from hydrophobic surfaces during drop tower tests

et al. 2016

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“…Work was done over a broad spectrum of analysis problems [15][16][17] . Improvements were made to the in-house CFM system level sizing code CryoSIM for cryocooler/circulator mass/power sizing correlations, insulation mass estimates, TVS mass and power estimates, empirical strut and penetration heat loads, mass gauge mass and power estimates and LAD mass estimates.…”

Section: E Analytical Tool Developmentmentioning

confidence: 99%

The Cryogenic Propellant Storage and Transfer Technology Demonstration Mission: Progress and Transition

Meyer¹,

Taylor²,

Ginty³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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In support of its goal to find an innovative path for human space exploration, NASA embarked on the Cryogenic Propellant Storage and Transfer (CPST) Project, a Technology Demonstration Mission (TDM) to test and validate key cryogenic capabilities and technologies required for future exploration elements, opening up the architecture for large in-space cryogenic propulsion stages and propellant depots. Planning for a demonstration mission began in 2010, and over several years the project has evolved from a very large, hydrogen and oxygen Flagship Technology Demonstrator to a single fluid (hydrogen) TDM. Through the work of a dedicated team, the mission successfully passed critical milestones including Mission Concept Review (MCR), Systems Requirements Review (SRR) and Mission Definition Review (MDR), and Key Decision Point B giving the project management authority to proceed to Preliminary Design Review (PDR). Despite these technical and programmatic successes, inFebruary 2014, the funding appropriated to NASA by the Congress was not sufficient to continue with the flight mission, and the project was redirected to a less costly ground test and analysis activity to commence in Fiscal Year (FY) 2015. In addition to developing and maturing a concept for the flight demonstration, the team completed significant advances to the cryogenic fluid management technology field. Recognizing that key Cryogenic Fluid Management (CFM) technologies anticipated for on-orbit (flight) demonstration would benefit from additional maturation to a readiness level appropriate for infusion into the design of the flight demonstration, the NASA Headquarters Space Technology Mission Directorate (STMD) authorized funding for a 1-year technology maturation phase of the CPST project. The strategy, proposed by the CPST Project Manager, focused on maturation through modeling, concept studies, and ground tests of the storage and fluid transfer CFM technology subelements and components that were lower than a Technology Readiness Level (TRL) of 5. A technology maturation plan (TMP) was subsequently approved which described: the CFM technologies selected for maturation, the ground testing approach to be used, quantified success criteria of the technologies, hardware and data deliverables, and a deliverable to provide an assessment of the technology readiness after completion of the test, study or modeling activity. The specific technologies selected were grouped into five major categories: thick multilayer insulation, tank applied active thermal control, cryogenic fluid transfer, propellant gauging, and analytical tool development. Based on the success of the technology maturation efforts, the CPST project was approved to proceed to flight system development. NomenclatureAR&D = autonomous rendezvous and docking ATP = authority to proceed CFM = cryogenic fluid management CPST = cryogenic propellant storage and transfer technology demonstration mission KDP = key decision point LAD = liquid acquisition device 1 CPST Principal Investigator, M/S 301-3, 2100...

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“…In light of such possibilities, the MA7 geometry is revisited herein using a modern open-source numerical free-surface solver called SE-FIT [7]. SE-FITemploys Brakke's Surface Evolver (SE) program [8] as a kernel within a fluid interface tool (FIT) that improves the efficiency of conducting free surface equilibrium computations.…”

Section: Nomenclature Amentioning

confidence: 99%

Fifty-Plus-Year Postflight Analysis of First Fluid Experiment Aboard a Spacecraft

Weislogel¹,

Chen²,

Masica³

et al. 2017

AIAA Journal

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Introducing SE-FIT: Surface Evolver - Fluid Interface Tool for Studying Capillary Surfaces

Cited by 17 publications

References 11 publications

Puddle jumping: Spontaneous ejection of large liquid droplets from hydrophobic surfaces during drop tower tests

Puddle jumping: Spontaneous ejection of large liquid droplets from hydrophobic surfaces during drop tower tests

The Cryogenic Propellant Storage and Transfer Technology Demonstration Mission: Progress and Transition

Fifty-Plus-Year Postflight Analysis of First Fluid Experiment Aboard a Spacecraft

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