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Abstract: Molten FeCo
alloys were processed using electrostatic levitation at the NASA Marshall Space Flight
Center in order to evaluate thermophysical properties of the melt in support of
industrial fluid flow modeling efforts for the casting industry. Digital image analysis
of the spherical sample profile is used to track volume as a function of temperature for
density measurements. The ... read moreoscillating drop technique is used for measuring viscosity and
surface tension. The goal of this work is to evaluate error associated with conducting
measurements during cooling as compared to conducting the measurements at constant
temperature. Density measurements were found to be significantly influenced by mass
evaporation during the test and a new method of tracking composition changes is
proposed. Surface tension measurements were independent of temperature and differences
in processing mode with values between 1.70 and 1.79 N/m. In contrast, isothermal
viscosities exhibited the expected Arrhenius relationship with temperature while the
thermotransient viscosities varied significantly from these values and did not follow
anticipated trends.
Thesis (M.S.)--Tufts University,
2012.
Submitted to the Dept. of Mechanical
Engineering.
Advisor: Douglas
Matson.
Committee: Douglas Matson, Luisa Chiesa, and
Richard Bradshaw.
Keywords: Mechanical engineering,
and Materials Science.read less
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