Thermophysical properties of equilibrium and supercooled liquid platinum were measured using non-contact diagnostic techniques with an electrostatic levitator. Over the 1691 to 2216 K temperature range, the density can be expressed as ρ(T)=19.2 ×103-0.96(T-Tm) (kg ·m-3) with Tm=2041 K, yielding a volume expansion coefficient of 5.0 ×10-5 K-1. In addition, the surface tension can be expressed as γ(T)=1.80 ×103-0.14(T-Tm) (10-3 N ·m-1) and the viscosity as η(T)=0.25 exp
[4.99 ×104/(RT)] (10-3 Pa ·s) over the 1743 to 2313 K temperature range.
Electrostatic levitators use strong electric fields to levitate and accurately position a sample against gravity. In this study, the effects of the electric field are investigated with regard to viscosity measurements conducted with the oscillating drop method. The effects of the external field on viscosity measurements are experimentally confirmed by changing the sample size. Moreover, a numerical simulation based on a simple mass-spring-damper system can reproduce the experimental observations. Based on the above results, measurement procedures are improved. These help to minimize the effect of the positioning force and to increase the accuracy of the viscosity measurements.
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