Gas viscosity measurement with diamagnetic-levitation viscometer based on electromagnetically spinning system

Utilizing a graphite-disk probe attached with a thinaluminum disk, we have developed a friction-freeviscosity measurement system. The probe is levitated above a NdFeB magnet because ofdiamagnetic effect and rotated by an electromagnetically inducedtorque. The probe is absolutely free form mechanicalfriction, and therefore, the accuratemeasurements of theviscosity of gases can be achieved. To demonstrate the accuracy and sensitivity of our method, wemeasured theviscosity of 8 kinds of gases and its temperature change from 278 K to 318 K, and we confirmed a good agreement between the obtained values and literature values. This paper demonstrates that our method has the ability tomeasure the fluidviscosity in the order ofμPa ⋅ s.

Source: Review of Scientific Instruments - December 8, 2016 Category: Physics Authors: Y. Shimokawa, Y. Matsuura, T. Hirano and K. Sakai Source Type: research