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

Content Provider	Springer Nature Link
Author	Takeda, Osamu Iwamoto, Hirone Sakashita, Ryota Iseki, Chiaki Zhu, Hongmin
Copyright Year	2017
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 $$1000\,\hbox {mPa}{\cdot }\hbox {s}$$ , the error on the MBP could be decreased to +1.7 % by increasing the bubble detachment time to $$300\,\hbox {s}$$ . However, the error was still over 1 % even when the bubble detachment time was increased to $$600\,\hbox {s}$$ . 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 $$1000\,\hbox {mPa}{\cdot } \hbox {s}$$ of viscosity. Furthermore, for silicone oil with a viscosity as high as $$10\,000\,\hbox {mPa}{\cdot }\hbox {s}$$ , 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 $$\hbox {SiO}_{2}$$ –40 $$\hbox {mol}\%\hbox {Na}_{2}\hbox {O}$$ and $$\hbox {SiO}_{2}$$ –50 $$\hbox {mol}\%\hbox {Na}_{2}\hbox {O}$$ 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.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	38
Issue Number	7
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2017-05-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Maximum bubble pressure method Silicate Surface tension Viscosity Condensed Matter Physics Classical Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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