A database for Couette flow rate considering the effects of non-symmetric molecular interactions

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A complete database for Couette flow rate (Q c (D,α 12 ), 0.1 ≤ α 1 , α 2 ≤ 1.0, 0.01 ≤ D ≤ 100, where D=inverse Knudsen number) for ultra-thin gas film lubrication problems is advanced. When the accommodation coefficients (AC) of the two lubricating surfaces are different (α 1 ≠α 2 ), the Couette flow rate in the modified molecular gas film lubrication (MMGL) equation should be corrected. The linearized Boltzmann equation (under small Mach number conditions) is solved numerically for the case of non-symmetric molecular interactions (α 1 ≠ α 2 ). The Couette flow rate is then calculated, and the database is constructed. The present database can be easily implemented in the MMGL equation. In addition, the present database extends the previously published results for 0.1 ≤ α 1 , α 2 ≤ 0.7. The database for low ACs is valuable in the analysis and applications of MEMS devices (bushings of electrostatic micro motors, micro bearings, magnetic head/disk interfaces, etc.), and their future development.

Original languageEnglish
Pages (from-to)869-873
Number of pages5
JournalJournal of Tribology
Volume124
Issue number4
DOIs
Publication statusPublished - 2002 Oct 1

Fingerprint

Molecular interactions
Couette flow
molecular interactions
lubrication
flow velocity
Flow rate
molecular gases
Lubrication
bushings
Gases
magnetic bearings
accommodation coefficient
Knudsen flow
Mach number
Bearings (structural)
microelectromechanical systems
alternating current
Magnetic heads
Bushings
Boltzmann equation

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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A database for Couette flow rate considering the effects of non-symmetric molecular interactions. / Li, Wang-Long.

In: Journal of Tribology, Vol. 124, No. 4, 01.10.2002, p. 869-873.

Research output: Contribution to journalArticle

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