Real-time measurement of particle volume fraction in centrifugal fields by wireless electrical resistance detector

The effects of saline solution on the electrical resistance of single wall carbon nanotubes-epoxy nanocomposites have been investigated experimentally. Ultrasonic assisted fabricated 1.0% and 0.5 W/W% SWCNTs epoxy nanocomposites are integrated into a Kelvin structure by smear cast the nanocomposites on a glass wafer. Four metal pads are deposited on the nanocomposites using the beam evaporator and wires are tethered using soldering. The effect of saline solution on the electrical resistance of the nanocomposites is studied by adding drop of saline solution to the surface of the fabricated nanocomposites and measuring electrical resistance. Moreover, the nanocomposites are soaked completely into 3 wt.% saline solution and real-time measurement of the electrical resistance is conducted. It is found that a drop of saline solution on the surface of the nanocomposites film increases the resistance by 50%. Furthermore, the real-time measurement reveals a 40% increase in the resistance of the nanocomposites film. More importantly, the nanocomposites are successfully reset by soaking in DI water for four hours. This study may open the door for using SWCNTs epoxy nanocomposites as scale sensors in oil and gas industry.

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OS1013-190 An Evaluation on Strain Rate Sensitivity of Martensitic Volume Fraction in TRIP Steel by Real-time Measurement of Relative Magnetic Permeability

The Proceedings of the Materials and Mechanics Conference ◽

10.1299/jsmemm.2015._os1013-19 ◽

2015 ◽

Vol 2015 (0) ◽

pp. _OS1013-19-_OS1013-19

Author(s):

Yutaro MORIYAMA ◽

Takeshi IWAMOTO

Keyword(s):

Strain Rate ◽

Real Time ◽

Strain Rate Sensitivity ◽

Magnetic Permeability ◽

Trip Steel ◽

Volume Fraction ◽

Rate Sensitivity ◽

Time Measurement ◽

Relative Magnetic Permeability ◽

Real Time Measurement

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Relationship Between Particles Volume Fraction Distribution and Electrical Properties in Rotational Liquid

Volume 5: Student Paper Competition ◽

10.1115/icone24-60789 ◽

2016 ◽

Author(s):

Yuya Akimoto ◽

Fumiya Nagae ◽

Kazuya Okawa ◽

Yoshiyuki Iso ◽

Noriaki Ichijo ◽

...

Keyword(s):

Sodium Chloride ◽

Real Time ◽

Electrical Resistance ◽

Chloride Solution ◽

Sodium Chloride Solution ◽

Particle Concentration ◽

Volume Fraction ◽

Rotational Velocity ◽

Particle Volume ◽

Measured Resistance

A wireless electrical resistance detector has been developed to measure the real-time particle volume fraction in a centrifuge for controlling a rotational velocity and particle supply rate. The purpose of this study is development of real-time particle concentration measurement technique in centrifuges because a technique for measuring the particle concentration in the centrifuges has not existed yet. The wireless electrical resistance detector was attached around a centrifuge for real centrifuge measurement experiment. This experimental centrifuge had electrodes which were covered with dielectric poly methyl methacrylate to avoid conductivity around the electrodes. The wireless electrical resistance detector was lightweight because the centrifuge condition is very severe because the rotational velocity was 3790rpm and gravity was 2000G. At first, sodium chloride solution was put in the centrifuge for the reaction stabilization of the wireless electrical resistance detector. Next, slurry of sodium chloride solution and acrylic particles with 50μm was continuously supplied in centrifuge for 10 minutes. As a result, the measured voltage was increased because the slurry was piled up in the vicinity of centrifuge inner wall. The measured resistance was increased with the lapse of time. The measured resistance coincides with an anticipated tendency of resistance. A change of particle volume fractions was measured in the centrifuge by the wireless electrical resistance detector.

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