Development of viscosity standard with Electro-Magnetically Spinning System

2017 Fiscal Year Final Research Report

• Project/Area Number: 26600132
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: General applied physics
• Research Institution: The University of Tokyo
• Principal Investigator: Sakai Keiji 東京大学, 生産技術研究所, 教授 (00215584)
• Co-Investigator(Renkei-kenkyūsha): MITANI Syujiro 東京大学, 生産技術研究所, 助教 (10334369) ; HIRANO Taichi 東京大学, 生産技術研究所, 技術職員 (00401282)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: レオロジー / 粘性 / 弾性 / 標準 / 気体 / 電磁スピニング

Outline of Final Research Achievements

We developed a new measurement system of gas viscosity employing a magnetically levitated disk probe. From the results of the relation between the applied torque and the rotational speed of the disk prove obtained for various kinds of gases, we successfully found that the f gases can be distinguished by their viscosity. For more accurate measurement, we examined the braking effect brought about by the inhomogeneity of the static magnetic field applied for the levitation. We then measured the gas viscosity at low pressures using the high vacuum chamber, where the apparent gas viscosity decreases due to the decrease of the carrier molecules of momentum. The achieved value of the lowest viscosity is 1/100,000 of that of the pure water, which is in principle the possible accuracy of the viscosity measurement.

Free Research Field

ナノレオロジー工学