Development of Maximum Bubble Pressure Method for Surface Tension Measurement of High Viscosity Molten Silicate

Osamu Takeda, Hirone Iwamoto, Ryota Sakashita, Chiaki Iseki, Komin Shu

Research output: Contribution to journalArticlepeer-review

Abstract

A surface tension measurement method based on the maximum bubble pressure (MBP) method was developed in order to precisely determine the surface tension of molten silicates in this study. Specifically, the influence of viscosity on surface tension measurements was quantified, and the criteria for accurate measurement were investigated. It was found that the MBP apparently increased with an increase in viscosity. This was because extra pressure was required for the flowing liquid inside the capillary due to viscous resistance. It was also expected that the extra pressure would decrease by decreasing the fluid velocity. For silicone oil with a viscosity of 1000mPa·s, the error on the MBP could be decreased to +1.7 % by increasing the bubble detachment time to 300s. However, the error was still over 1 % even when the bubble detachment time was increased to 600s. Therefore, a true value of the MBP was determined by using a curve-fitting technique with a simple relaxation function, and that was succeeded for silicone oil at 1000mPa·s of viscosity. Furthermore, for silicone oil with a viscosity as high as 10000mPa·s, the apparent MBP approached a true value by interrupting the gas introduction during the pressure rising period and by re-introducing the gas at a slow flow rate. Based on the fundamental investigation at room temperature, the surface tension of the SiO 2–40 mol % Na 2O and SiO 2–50 mol % Na 2O melts was determined at a high temperature. The obtained value was slightly lower than the literature values, which might be due to the influence of viscosity on surface tension measurements being removed in this study.

Original languageEnglish
Article number109
JournalInternational Journal of Thermophysics
Volume38
Issue number7
DOIs
Publication statusPublished - 2017 Jul 1

Keywords

  • Maximum bubble pressure method
  • Silicate
  • Surface tension
  • Viscosity

ASJC Scopus subject areas

  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Development of Maximum Bubble Pressure Method for Surface Tension Measurement of High Viscosity Molten Silicate'. Together they form a unique fingerprint.

Cite this