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Viscosity measurement of melt at high pressure

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Viscosity of melt under high pressure has been measured using a falling sphere method, where the viscosity is determined by the sinking velocity of sphere using Stokes equation. An x-ray radiography technique with synchrotron radiation is very useful for the falling sphere viscosity measurement, because it enables us in situ observation of the sinking process and determination of the reliable viscosity. Figure shows the observed images of Pt sphere sinking in NaAlSi3O8 melt at high pressure and high temperature using the SPEED-1500. The high-speed and high-resolution CCD camera provided very good visual contrast between the Pt sphere and melt possible in a short exposure time (1/30 s). The high pressure viscometry using the X-ray radiography technique is very promising for the precise viscosity measurement to various melts in Earths interior, such as magma and outer core melt.

 

Fig. Real-time images of Pt sphere sinking in NaAlSi3O8 melt at high pressure and high temperature (4.2 GPa and 1700℃).

[ K. Funakoshi, A. Suzuki and H. Terasaki, Journal of Physics :Condensed Matter 14, 11343-11347 (2002), Fig. 3,
©2002 Institute of Physics and IOP Publishing, Ltd. ]

 

Scientific keywords

A. Sample category inorganic material, research on method, instrumentation
B. Sample category (detail) metal, alloy, insulator, ceramics, liquid, melt
C. Technique X-ray transmission, absorption and its secondary process
D. Technique (detail)
E. Particular condition high pressure (press), tensile loading, high-T (> 500 C), time-resolved (µs)
F. Photon energy X-ray (> 40 keV)
G. Target information chemical bonding, structural change, morphology

Industrial keywords

level 1---Application area industrial material, others
level 2---Target
level 3---Target (detail)
level 4---Obtainable information structure of non-crystalline material
level 5---Technique imaging

Inquiry number

SOL-0000001204

Last modified 2019-11-21 17:08
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