Research Papers: Fundamental Issues and Canonical Flows

Fluid Stiction Modeling for Quickly Separating Plates Considering the Liquid Tensile Strength

[+] Author and Article Information
Daniel B. Roemer

Fluid Power and Mechatronic Systems,
Department of Energy Technology,
Aalborg University,
Aalborg East 9220, Denmark
e-mail: dbr@et.aau.dk

Per Johansen

Fluid Power and Mechatronic Systems,
Department of Energy Technology,
Aalborg University,
Aalborg East 9220, Denmark
e-mail: pjo@et.aau.dk

Henrik C. Pedersen

Fluid Power and Mechatronic Systems,
Department of Energy Technology,
Aalborg University,
Aalborg East 9220, Denmark
e-mail: hcp@et.aau.dk

Torben O. Andersen

Fluid Power and Mechatronic Systems,
Department of Energy Technology,
Aalborg University,
Aalborg East 9220, Denmark
e-mail: toa@et.aau.dk

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 16, 2014; final manuscript received January 27, 2015; published online March 9, 2015. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 137(6), 061205 (Jun 01, 2015) (8 pages) Paper No: FE-14-1595; doi: 10.1115/1.4029683 History: Received October 16, 2014; Revised January 27, 2015; Online March 09, 2015

Fluid stiction may significantly influence the dynamic behavior when attempting to quickly separate two plates in close contact. The liquid fluid film, filling the gap between the plates, experiences a pressure drop resulting from an increasing distance, and cavitation may appear if sufficient separation speed and low plate distance are present. In the case of small initial plate separation, fluid tension is known to develop and the stiction force may exceed the maximum stiction force calculated by assuming strictly positive pressures in the fluid film. In this paper, a model for simulating the time dependent fluid stiction phenomenon, including a fluid tensile strength and cavitation effects, is proposed. The model is based on Reynolds theory, and the pressure distribution in the liquid zone is solved analytically for each time step, leading to a computationally efficient model without the need for finite element/volume methods. The considered geometry is two long parallel plates submerged in liquid, as present in many valve applications. The model is compared to experimental measurements, and it is found that the model is able to predict the stiction effect with reasonable accuracy given that proper selections of liquid tensile strength and initial plate distance are made.

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Fig. 2

Valve seating liquid film geometry. A flat surface (moving part) is forced away from the curved surface (stationary part), and stiction force arises as a local low pressure region is formed in the seat region.

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Fig. 1

Considered separation geometry. Cross-sectional length of contact surfaces is small compared to R.

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Fig. 3

Typical pressure distributions for the different cavitation cases and corresponding film zones. In case of cavitation, a central cavitated zone is present with p = 0, and the remaining (liquid) part of the film is solved using the Reynolds equation.

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Fig. 4

Possible liquid/vapor mixtures in cavitation zone. The cavitation boundary speed is set to depend on the vapor/liquid ratio inside the cavitation zone.

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Fig. 5

Geometry of experimental setup. The moving member is submerged in mineral oil at room temperature and an opening force is applied while measuring the resulting movement.

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Fig. 8

Pressure fields and corresponding dynamic response of the characteristic states for different opening force levels. From the top: 6 N, 10 N, 20 N, and 40 N opening force reference. The simulations correspond to those compared to measurements as shown in Fig. 6. For small opening forces, cavitation does not occur whereas higher opening forces result in cavitation effects.

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Fig. 6

Measured and simulated movement as response to different levels of opening force. Good agreement is seen for the force references at or above 10 N and reasonable agreement is seen for the smaller force references.

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Fig. 7

Pressure field versus time (with two different viewing angles, view B from below), where significant regions with liquid tension are seen. The pressure field corresponds to the stiction simulation with 10 N force reference also shown in Fig. 6.



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