Effect of Surface Roughness on Performance of Spiral Groove Gas Film Face Seal

2012 ◽  
Vol 184-185 ◽  
pp. 180-183 ◽  
Author(s):  
Gang Ma ◽  
Wei Zhao ◽  
Xin Min Shen
Keyword(s):  
Surface Roughness ◽  
Three Dimensional ◽  
Great Influence ◽  
Face Seal ◽  
Dimensional Model ◽  
Spiral Groove ◽  
Three Dimensional Model ◽  
Three Dimensional Flow ◽  
Gas Face Seal ◽  
Effect Of Surface

The three dimensional model was established for studying performance of spiral groove gas face seal. According to machining features of different surface area, the seal face can be divided into three parts, rotor ring grooved area, rotor ring non-grooved area and static ring area. The effect of roughness on seal performance was analyzed based on calculation of three dimensional flow field. The analysis results show that the surface roughness of rotor ring grooved area has great influence on the seal performance, but the influence is little when roughness on non-grooved rotor ring surface and static ring surface. The influence must be considered when surface roughness of rotor ring grooved area bigger than 0.2μm. Roughness of rotor ring surface can increase the loading force while it also can cause the increase of leakage. It is important to select rational roughness when designing gas face seal.

Effects of Surface Roughness and Slip Flow on the Performance of a Spiral Groove Gas Face Seal

2007 ◽  
Author(s):  
Xu-Dong Peng ◽  
Song-En Sheng ◽  
Xiao-Ni Yin ◽  
Ji-Yun Li
Keyword(s):  
Surface Roughness ◽  
Standard Deviation ◽  
Slip Flow ◽  
Element Model ◽  
Face Seal ◽  
Spiral Groove ◽  
Sealing Performance ◽  
Set Up ◽  
Gas Face Seal ◽  
Effect Of Surface

Considering the effects of surface roughness and slip flow, the extended Reynolds equation presented by Makino et al [1] is used to set up the finite element model for a non-contact spiral groove dry gas face seal (S-DGS). The analyses for a typical S-DGS at low speed (≤ 500 rpm) and low pressure (≤ 0.606 MPa) showed that the effect of slip flow on the sealing performance is significant for 0.05≤ Kn < 1.0, where Kn refers to the Knudsen number, but the effect of surface roughness on the sealing performance varies with the different areas of both the two faces. When the standard deviation of composite roughness is less than 1.0 micron and in the range of 0.5≤ Kn≤ 1.0, the effects of surface roughness and slip flow diminished on gas film stiffness and frictional work but are still significant on the leakage rate. The effect of surface roughness of the spiral groove bottom is significant and should be considered, but the effects of the other surface roughness, i.e. the soft ring surface roughness and the un-grooved hard ring surface roughness, are negligible only when the value of the standard deviation of composite roughness meets with API standards.

scholarly journals Roughness effect on the efficiency of dimer antenna based biosensor

2012 ◽  
Vol 1 (2) ◽  
pp. 41 ◽  
Author(s):  
D. Barchiesi ◽  
S. Kessentini
Keyword(s):  
Surface Roughness ◽  
Near Field ◽  
Three Dimensional ◽  
Biological Molecules ◽  
Far Field ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Roughness Effect ◽  
Highly Sensitive ◽  
Local Plasmon

The fabrication process of nanodevices is continually improved. However, most of the nanodevices, such as biosensors present rough surfaces with mean roughness of some nanometers even if the deposition rate of material is more controlled. The effect of roughness on performance of biosensors was fully addressed for plane biosensors and gratings, but rarely addressed for biosensors based on Local Plasmon Resonance. The purpose of this paper is to evaluate numerically the influence of nanometric roughness on the efficiency of a dimer nano-biosensor (two levels of roughness are considered). Therefore, we propose a general numerical method, that can be applied to any other nanometric shape, to take into account the roughness in a three dimensional model. The study focuses on both the far-field, which corresponds to the experimental detected data, and the near-field, responsible for exciting and then detecting biological molecules. The results suggest that the biosensor efficiency is highly sensitive to the surface roughness. The roughness can produce important shifts of the extinction efficiency peak and a decrease of its amplitude resulting from changes in the distribution of near-field and absorbed electric field intensities.

The Dynamic Performance Research of Fixture for Automobile Hydraulic Vibration Reliability Test

2010 ◽  
Vol 37-38 ◽  
pp. 1452-1456
Author(s):  
Yi Shan Zeng
Keyword(s):  
Hydraulic System ◽  
Dynamic Performance ◽  
Three Dimensional ◽  
Great Influence ◽  
Reliability Test ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Vibration Reliability ◽  
Vibration Modal ◽  
Performance Research

In order to test the reliability of automobile hydraulic, the vibration reliability test needs to be done. The fixture, which is used to clamp and fix the hydraulic system, is one of the most important components of the test. So the dynamic performance of the fixture has great influence on the vibration test. According to the figure and setting localization of electronics, the three-dimensional model of fixture was constituted. The modal frequency and vibration modal were calculated using FEM. By the result of analysis, the structure of the fixture was mended to meet the test requirement.

The Effects of Three-Dimensional Model Surface Roughness Features on Lubricant Film Thickness in EHL Contacts

2003 ◽  
Vol 125 (3) ◽  
pp. 533-542 ◽  
Author(s):  
Jian W. Choo ◽  
Romeo P. Glovnea ◽  
Andrew V. Olver ◽  
Hugh A. Spikes
Keyword(s):  
Surface Roughness ◽  
Film Thickness ◽  
Three Dimensional ◽  
Lubricant Film ◽  
Imaging Method ◽  
Dimensional Model ◽  
Lubricant Film Thickness ◽  
Model Surface ◽  
Three Dimensional Model ◽  
Spacer Layer

The Spacer Layer Imaging method has been used to investigate the influence of three-dimensional roughness features on the thickness and shape of elastohydrodynamic (EHL) films. An array of near-hemispherical bumps was employed to represent asperities. A micro-EHL film developed at the bumps whose orientation depended on that of the inlet boundary at the location at which the bump had entered the contact. Rolling-sliding conditions induced a micro-EHL film with a classical horseshoe shape at the bumps. The flow of lubricant around the bumps appeared to differ between thin and thick films.

scholarly journals Three-dimensional flow near a reconnection site at the dayside magnetopause: analytical solutions coupled with MHD simulations

2007 ◽  
Vol 73 (6) ◽  
pp. 811-819 ◽  
Author(s):  
LARS G. WESTERBERG ◽  
J. VEDIN ◽  
A. EKENBÄCK ◽  
H. O. ÅKERSTEDT
Keyword(s):  
Plasma Flow ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Three Dimensional Flow ◽  
Mhd Simulation ◽  
Mhd Simulations ◽  
Dayside Magnetopause ◽  
Global Mhd Simulation ◽  
Reconnection Site

AbstractWe present a coupling between an analytical three-dimensional model covering the plasma flow behaviour through the magnetopause transition layer near a reconnection site, with results from a global MHD simulation describing the plasma flow in the magnetosheath. The structure of the plasma flow near a reconnection site at the dayside terrestrial magnetopause is investigated, together with the development of the magnetopause transition region.

scholarly journals Study on the Technology of Solid Expandable Tubular in Open-Hole Well

2020 ◽  
Author(s):  
Xiaohua Zhu ◽  
Feilong Cheng ◽  
Changshuai Shi ◽  
Kailin Chen
Keyword(s):  
Theoretical Basis ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Great Influence ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Open Hole ◽  
Plastic Forming ◽  
Borehole Size ◽  
Shaft Wall

Abstract During the production and drilling of open hole wells, due to the uncertainty and complexity of the rock,The naked hole section is prone to accidents such as collapse of the shaft wall and leakage. In order to solve the above problems, this paper proposes the plugging technology of solid expandable tubualr(SET) in open-hole wells. Based on experimental data,this paper established a dynamic three-dimensional model which considers friction and contact. The author puts forward the applicability criterion of open hole and studies the sensitivity parameters of expansion cone. The research results show that when SET specifications are determined, the borehole size of the open hole well has a great influence on the contact pressure, residual stress, driving force and other factors after the SET is formed, and to a certain extent affects the subsequent service. In addition, the structural parameters of the expansion cone also have a great influence on the plastic forming of SET. The results of this paper provide guidelines and theoretical basis for the use of SET technology in open hole wells.

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