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Title: Gas-Induced Motion of a Piston in a Vibrated Liquid-Filled Housing

Abstract

We present that models and experiments are developed to investigate how a small amount of gas can cause large rectified motion of a piston in a vibrated liquid-filled housing when piston drag depends on piston position so that damping is nonlinear even for viscous flow. Two bellows serve as surrogates for the upper and lower gas regions maintained by Bjerknes forces. Without the bellows, piston motion is highly damped. With the bellows, the piston, the liquid, and the two bellows move together so that almost no liquid is forced through the gaps between the piston and the housing. This Couette mode has low damping and a strong resonance: the piston and the liquid vibrate against the spring formed by the two bellows (like the pneumatic spring formed by the gas regions). Near this resonance, the piston motion becomes large, and the nonlinear damping produces a large rectified force that pushes the piston downward against its spring suspension. A recently developed model based on quasi-steady Stokes flow is applied to this system. A drift model is developed from the full model and used to determine the equilibrium piston position as a function of vibration amplitude and frequency. Corresponding experiments are performedmore » for two different systems. In the two-spring system, the piston is suspended against gravity between upper and lower springs. Lastly, in the spring-stop system, the piston is pushed up against a stop by a lower spring. Model and experimental results agree closely for both systems and for different bellows properties.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1496994
Report Number(s):
SAND-2019-1046J
Journal ID: ISSN 0098-2202; 672001
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Fluids Engineering
Additional Journal Information:
Journal Volume: 141; Journal Issue: 9; Journal ID: ISSN 0098-2202
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Pistons; Springs; Bellows (Equipment); Damping; Resonance; Gravity (Force); Drag (Fluid dynamics); Equilibrium (Physics); Viscous flow; Vibration

Citation Formats

Torczynski, John R., O'Hern, Timothy J., Clausen, Jonathan R., and Koehler, Timothy P.. Gas-Induced Motion of a Piston in a Vibrated Liquid-Filled Housing. United States: N. p., 2019. Web. doi:10.1115/1.4042757.
Torczynski, John R., O'Hern, Timothy J., Clausen, Jonathan R., & Koehler, Timothy P.. Gas-Induced Motion of a Piston in a Vibrated Liquid-Filled Housing. United States. doi:10.1115/1.4042757.
Torczynski, John R., O'Hern, Timothy J., Clausen, Jonathan R., and Koehler, Timothy P.. Wed . "Gas-Induced Motion of a Piston in a Vibrated Liquid-Filled Housing". United States. doi:10.1115/1.4042757.
@article{osti_1496994,
title = {Gas-Induced Motion of a Piston in a Vibrated Liquid-Filled Housing},
author = {Torczynski, John R. and O'Hern, Timothy J. and Clausen, Jonathan R. and Koehler, Timothy P.},
abstractNote = {We present that models and experiments are developed to investigate how a small amount of gas can cause large rectified motion of a piston in a vibrated liquid-filled housing when piston drag depends on piston position so that damping is nonlinear even for viscous flow. Two bellows serve as surrogates for the upper and lower gas regions maintained by Bjerknes forces. Without the bellows, piston motion is highly damped. With the bellows, the piston, the liquid, and the two bellows move together so that almost no liquid is forced through the gaps between the piston and the housing. This Couette mode has low damping and a strong resonance: the piston and the liquid vibrate against the spring formed by the two bellows (like the pneumatic spring formed by the gas regions). Near this resonance, the piston motion becomes large, and the nonlinear damping produces a large rectified force that pushes the piston downward against its spring suspension. A recently developed model based on quasi-steady Stokes flow is applied to this system. A drift model is developed from the full model and used to determine the equilibrium piston position as a function of vibration amplitude and frequency. Corresponding experiments are performed for two different systems. In the two-spring system, the piston is suspended against gravity between upper and lower springs. Lastly, in the spring-stop system, the piston is pushed up against a stop by a lower spring. Model and experimental results agree closely for both systems and for different bellows properties.},
doi = {10.1115/1.4042757},
journal = {Journal of Fluids Engineering},
number = 9,
volume = 141,
place = {United States},
year = {2019},
month = {2}
}

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