This paper presents direct simulation Monte Carlo (DSMC) numerical investigation of the dynamic behavior of a gas film in a microbeam. The microbeam undergoes large amplitude harmonic motion between its equilibrium position and the fixed substrate underneath. Unlike previous work in literature, the beam undergoes large displacements throughout the film gap thickness and the behavior of the gas film along with its impact on the moving microstructure (force exerted by gas on the beam's front and back faces) is discussed. Since the gas film thickness is of the order of few microns (i.e., 0.01 < Kn < 1), the rarefied gas exists in the noncontinuum regime and, as such, the DSMC method is used to simulate the fluid behavior. The impact of the squeeze film on the beam is investigated over a range of frequencies and velocity amplitudes, corresponding to ranges of dimensionless flow parameters such as the Reynolds, Strouhal, and Mach numbers on the gas film behavior. Moreover, the behavior of compressibility pressure waves as a function of these dimensionless groups is discussed for different simulation case studies.
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July 2016
Research-Article
Investigation of the Squeeze Film Dynamics Underneath a Microstructure With Large Oscillation Amplitudes and Inertia Effects
Nadim A. Diab,
Nadim A. Diab
Assistant Professor
Department of Mechanical and
Mechatronics Engineering,
Rafik Hariri University,
Meshref 10-2010, Lebanon
e-mail: diabna@rhu.edu.lb
Department of Mechanical and
Mechatronics Engineering,
Rafik Hariri University,
Meshref 10-2010, Lebanon
e-mail: diabna@rhu.edu.lb
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Issam A. Lakkis
Issam A. Lakkis
Associate Professor
Department of Mechanical Engineering,
American University of Beirut,
Beirut 11-0236, Lebanon
e-mail: il01@aub.edu.lb
Department of Mechanical Engineering,
American University of Beirut,
Beirut 11-0236, Lebanon
e-mail: il01@aub.edu.lb
Search for other works by this author on:
Nadim A. Diab
Assistant Professor
Department of Mechanical and
Mechatronics Engineering,
Rafik Hariri University,
Meshref 10-2010, Lebanon
e-mail: diabna@rhu.edu.lb
Department of Mechanical and
Mechatronics Engineering,
Rafik Hariri University,
Meshref 10-2010, Lebanon
e-mail: diabna@rhu.edu.lb
Issam A. Lakkis
Associate Professor
Department of Mechanical Engineering,
American University of Beirut,
Beirut 11-0236, Lebanon
e-mail: il01@aub.edu.lb
Department of Mechanical Engineering,
American University of Beirut,
Beirut 11-0236, Lebanon
e-mail: il01@aub.edu.lb
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 19, 2015; final manuscript received November 23, 2015; published online May 4, 2016. Assoc. Editor: Daniel Nélias.
J. Tribol. Jul 2016, 138(3): 031704 (16 pages)
Published Online: May 4, 2016
Article history
Received:
April 19, 2015
Revised:
November 23, 2015
Citation
Diab, N. A., and Lakkis, I. A. (May 4, 2016). "Investigation of the Squeeze Film Dynamics Underneath a Microstructure With Large Oscillation Amplitudes and Inertia Effects." ASME. J. Tribol. July 2016; 138(3): 031704. https://doi.org/10.1115/1.4032951
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