Advertisement

Tribology Letters

, 67:72 | Cite as

The Flow of Triboplasma

  • Keiji NakayamaEmail author
  • Fumio Yagasaki
Original Paper
  • 42 Downloads

Abstract

Previously triboplasma was discovered in the rear gap of the sliding contact. Recently, the temperature of the triboplasma was successfully measured and demonstrated that the triboplasma is the non-equilibrium low-temperature plasma. During the course of the temperature rise distribution measurement of the triboplasma, flow of the triboplasma was observed. In this article, the triboplasma flow behaviors were investigated by measuring the triboplasma temperature rise distribution using a highly sensitive microscopic infrared camera. The measurement was performed in the tribosystem while a diamond pin with a tip radius of 4 mm slides on a sapphire disk with the wear track diameter of 40 mm in dry sliding in the ambient air under the normal forces of FN = 1 N and 2 N and the disk rotational velocities of ω = 10, 20, 50, 100, and 155 rpm, which correspond to the sliding velocities of V = 0.021, 0.042, 0.105, 0.21, and 0.324 m/s, respectively. In the experiments, the pin and disk specimens were warmed to raise the negligibly small temperature rise of the rear plasma tail region to the infrared camera imaging detection level by transferring the specimen’s heat to the plasma. Two types of plasma flows have been observed. One of them is a lamellar flow under the rotational velocity region of ω ≦ 10 rpm (V ≦ 0.021 m/s). This laminar flow transits to the turbulent one under ω ≧ 20 rpm (V ≧ 0.042 m/s). At the lamellar flow region, the triboplasma flows in the direction of sliding. However, at the turbulent flow region, the plasma flow direction shifts clockwise from the sliding line to the direction of disk rotation. The flow angle between the sliding line and the plasma flow one increases with the rotational velocity due to the centrifugal forces by disk rotation.

Keywords

Plasma Triboplasma Temperature distribution Low-temperature plasma Plasma flow Tribocharging 

Notes

Acknowledgement

The authors would like to express their thanks to the financial support by the Grant-in-aid for Scientific Research (A) 20246035, the Ministry of Education, Culture, Sports, Science and Technology.

References

  1. 1.
    Nakayama, K., Nevshupa, R.A.: Plasma generation in a gap around a sliding contact. J. Phys. D 35, L53–56 (2002)CrossRefGoogle Scholar
  2. 2.
    Nakayama, K., Yagasaki, F.: The temperature of triboplasma. Tribol. Lett. 66, 10 (2018)CrossRefGoogle Scholar
  3. 3.
    Finkelnburg, W., Segal, S.M.: High temperature plasma properties from high current arc stream measurements. Phys. Rev. 80, 258 (1950)CrossRefGoogle Scholar
  4. 4.
    Bikerton, R.J.: Introduction to high temperature plasma physics. Philos. Trans. R. Soc. Lond. 300, 475–488 (1981)CrossRefGoogle Scholar
  5. 5.
    Report of the department of energy office of fusion energy sciences, Low temperature plasma science: not only the fourth state of matter but all of them (Workshop on Low Temperature Plasmas) (2008)Google Scholar
  6. 6.
    Becker, K.H., Kogelshatz, U., Schoenbach, K.H., Barker, R.H.: Non-equilibrium Air Plasmas at Atmospheric Pressure. Institute of Physics, CRC Press, Boca Raton (2004)Google Scholar
  7. 7.
    Yang, Y., Cho, Y.I., Friedman, A.: Plasma Discharge in Liquid: Water Treatment and Applications. CRC Press, Boca Raton (2012)Google Scholar
  8. 8.
    Nakayama, K., Fujimoto, T.: The energy of electrons emitted from wearing solid surfaces. Tribol. Lett. 17, 75 (2004)CrossRefGoogle Scholar
  9. 9.
    Cameron, A.: The Principles of Lubrication. Longmans, London (1966)Google Scholar
  10. 10.
    Moore, D.S.: Principles and Application of Tribology. Pergamum International Library, Oxford (1975)Google Scholar
  11. 11.
    Nakayama, K.: Triboemission of charged particles and resistivity of solids. Tribol. Lett. 6, 37 (1999)CrossRefGoogle Scholar
  12. 12.
    Nakayama, K.: Triboemission of electrons, ions, and photons from diamondlike carbon films and generation of triboplasma. Surf. Coat. Technol. 188–189, 599 (2004)CrossRefGoogle Scholar
  13. 13.
    Ikeda, K., Ono, K.: Design consideration of contact/near-contact slider based on a rough surface contact model. Trans. Jpn. Soc. Mech. Eng. C 68, 1518 (2002)CrossRefGoogle Scholar
  14. 14.
    Nakayama, K., Mirza, S.M.: Verification of the decomposition of perfluoropolyether fluid due to triboplasma. Tribol. Trans. 49, 17 (2006)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of MesotechnologyKashiwaJapan
  2. 2.Ken Automation Inc.YokohamaJapan

Personalised recommendations