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Thermophysical Properties Measurement of High-Temperature Liquids Under Microgravity Conditions in Controlled Atmospheric ConditionsMicrogravity conditions have advantages of measurement of surface tension and viscosity of metallic liquids by the oscillating drop method with an electromagnetic levitation (EML) device. Thus, we are preparing the experiments of thermophysical properties measurements using the Materials-Science Laboratories ElectroMagnetic-Levitator (MSL-EML) facilities in the international Space station (ISS). Recently, it has been identified that dependence of surface tension on oxygen partial pressure (Po2) must be considered for industrial application of surface tension values. Effect of Po2 on surface tension would apparently change viscosity from the damping oscillation model. Therefore, surface tension and viscosity must be measured simultaneously in the same atmospheric conditions. Moreover, effect of the electromagnetic force (EMF) on the surface oscillations must be clarified to obtain the ideal surface oscillation because the EMF works as the external force on the oscillating liquid droplets, so extensive EMF makes apparently the viscosity values large. In our group, using the parabolic flight levitation experimental facilities (PFLEX) the effect of Po2 and external EMF on surface oscillation of levitated liquid droplets was systematically investigated for the precise measurements of surface tension and viscosity of high temperature liquids for future ISS experiments. We performed the observation of surface oscillations of levitated liquid alloys using PFLEX on board flight experiments by Gulfstream II (G-II) airplane operated by DAS. These observations were performed under the controlled Po2 and also under the suitable EMF conditions. In these experiments, we obtained the density, the viscosity and the surface tension values of liquid Cu. From these results, we discuss about as same as reported data, and also obtained the difference of surface oscillations with the change of the EMF conditions.
Document ID
20120015598
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Watanabe, Masahito (Gakushuin Univ. Tokyo, Japan)
Ozawa, Shumpei (Tokyo Metropolitan Univ. Yokohama, Japan)
Mizuno, Akotoshi (Gakushuin Univ. Tokyo, Japan)
Hibiya, Taketoshi (Keio Univ. Yokahama, Japan)
Kawauchi, Hiroya (Gakushuin Univ. Tokyo, Japan)
Murai, Kentaro (Gakushuin Univ. Tokyo, Japan)
Takahashi, Suguru (Tokyo Metropolitan Univ. Yokohama, Japan)
Date Acquired
August 26, 2013
Publication Date
September 1, 2012
Publication Information
Publication: Materials Research in Microgravity 2012
Subject Category
Space Processing
Distribution Limits
Public
Copyright
Public Use Permitted.

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