Hydrodynamic friction and the capacitance of arbitrarily shaped objects

1994 ◽  
Vol 49 (6) ◽  
pp. 5319-5331 ◽  
Author(s):  
Jack F. Douglas ◽  
Huan-Xiang Zhou ◽  
Joseph B. Hubbard
Keyword(s):  
Hydrodynamic Friction

scholarly journals Mutual Effect of Groove Size and Anisotropy of Cylinder Liner Honed Textures on Engine Performances

2014 ◽  
Vol 966-967 ◽  
pp. 175-183 ◽  
Author(s):  
Mohammed Yousfi ◽  
Sabeur Mezghani ◽  
Ibrahim Demirci ◽  
Mohamed El Mansori
Keyword(s):  
Mutual Effect ◽  
Cylinder Liner ◽  
Texture Features ◽  
Groove Depth ◽  
Oil Consumption ◽  
Hydrodynamic Friction ◽  
Liner Surface ◽  
Ring Pack ◽  
Mixed Lubrication Regime ◽  
Cylinder Bore

The cylinder liner surface texture, widely generated by the honing technique, contributes a lot on engine functional performances (friction, oil consumption, running-in, wear etc.). In order to improve these functional performances, different honing processes are being developed. These different honing processes generate surfaces with various texture features characteristics (roughness, valleys depth, valley width, cross hatch angle, etc.). This paper addresses a comparison of ring-pack friction for cylinder texture with different cross-hatch angles and valley sizes. It takes in consideration the mutual effect of valley depth and honing angle. A numerical model is developed to predict friction within the cylinder ring-pack system in mixed lubrication regime and a morphological method is used to characterize groove depth. The results show the effect of different honing variables (rotation speed, stroke speed and indentation pressure) on cylinder bore surface textures and hydrodynamic friction of the ring-pack system.

scholarly journals Hydrodynamic Friction of Viscosity-Modified Oils in a Journal Bearing Machine

2018 ◽  
Vol 66 (4) ◽  
Author(s):  
Sorin-Cristian Vladescu ◽  
Nigel Marx ◽  
Luis Fernández ◽  
Francisco Barceló ◽  
Hugh Spikes
Keyword(s):  
Journal Bearing ◽  
Hydrodynamic Friction

Mixed Lubrication Model for Cold Rolling Considering the Inlet and Deformation Zones

2012 ◽  
Author(s):  
Martin Bergmann ◽  
Klaus Zeman ◽  
Alexander Kainz ◽  
Konrad Krimpelstätter ◽  
Dieter Paesold ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Film Formation ◽  
Mixed Lubrication ◽  
Bulk Deformation ◽  
Metallic Surfaces ◽  
Hydrodynamic Friction ◽  
Plastic Strip ◽  
Coupled Equations ◽  
Inlet Zone ◽  
Raphson Method

A mixed lubrication model for cold rolling was developed by separating, according to common concepts, the domain of calculation into two zones: the inlet zone and the zone of plastic strip bulk deformation. The analysis of the inlet zone mainly focuses on film formation from different lubricants based on the evolution of layers consisting of neat oil on the metallic surfaces. In the zone of plastic strip bulk deformation, contributions of boundary and hydrodynamic friction are modeled incorporating longitudinal and transversal roughness components. Lubricant pressure, which is influenced by the geometry of these roughness structures, is governed by hydrodynamic mechanisms. Additionally, lubricant temperature in the roll bite is predicted by an integrated thermodynamics sub-model. While coupling between the inlet and plastic deformation zones is performed iteratively, the highly non-linear and coupled equations for the latter zone are solved simultaneously by applying a variant of the well-known damped Newton-Raphson method.

Lubricated steady sliding of a rigid sphere on a soft elastic substrate: hydrodynamic friction in the Hertz limit

Soft Matter ◽  
2020 ◽  
Vol 16 (11) ◽  
pp. 2760-2773 ◽  
Author(s):  
Haibin Wu ◽  
Nichole Moyle ◽  
Anand Jagota ◽  
Chung-Yuen Hui
Keyword(s):  
Rigid Sphere ◽  
Elastic Substrate ◽  
Hydrodynamic Friction ◽  
Elastic Substrates ◽  
Lubricated Sliding

Lubricated sliding on soft elastic substrates occurs in a variety of natural and technological settings.

Consideration of the multizone hydrodynamic friction, the misalignment of axes, and the contact compliance of a shaft and a bush of sliding bearings

2017 ◽  
Vol 38 (3) ◽  
pp. 242-251 ◽  
Author(s):  
M. V. Zernin ◽  
A. V. Mishin ◽  
N. N. Rybkin ◽  
S. V. Shil’ko ◽  
T. V. Ryabchenko
Keyword(s):  
Sliding Bearings ◽  
Hydrodynamic Friction ◽  
Contact Compliance

Reduction of the hydrodynamic friction of hydrocarbons by means of small additions of certain organosilicon polymers

1979 ◽  
Vol 36 (1) ◽  
pp. 1-3 ◽  
Author(s):  
V. S. Belokon' ◽  
N. B. Bespalova ◽  
V. M. Vdovin ◽  
S. A. Vlasov ◽  
V. N. Kalashnikov ◽  
...  
Keyword(s):  
Hydrodynamic Friction ◽  
Organosilicon Polymers

CHAIN ROTATIONAL DYNAMICS IN MR SUSPENSIONS

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2293-2299 ◽  
Author(s):  
SONIA MELLE ◽  
OSCAR G. CALDERÓN ◽  
MIGUEL A. RUBIO ◽  
GERALD G. FULLER
Keyword(s):  
Power Law ◽  
Rotating Magnetic Fields ◽  
Hydrodynamic Friction ◽  
Friction Forces ◽  
Number Ratio ◽  
Mason Number ◽  
Dynamics Simulations ◽  
Average Size ◽  
The Magnetic Field ◽  
Good Agreement

The dynamics of induced dipolar chains in magnetorhelogical suspensions subject to rotating magnetic fields has been experimentally studied combining scattering dichroism and video microscopy experiments. When a rotating field is imposed the chainlike aggregates rotate synchronously with the magnetic field. We found that the average size of the aggregates decreases with Mason number (ratio of viscous to magnetic forces) following a power law with exponent -0.5 being the hydrodynamic friction forces the cause of the chains break up. However the total number of aggregated particles shows two different behaviors depending on Mason number. For low Mason numbers, the total number of aggregated particles remains almost constant and above a critical Mason number, the rotation of the field prevents the particle aggregation process from taking place so the number of aggregated particles decreases with Mason number following a power law behavior with exponent -1. Athermal molecular dynamics simulations are also reported, showing good agreement with the experiments.

Drawing of steel rods in a hydrodynamic friction regime

1979 ◽  
Vol 15 (4) ◽  
pp. 312-313
Author(s):  
�. V. Timofeeva ◽  
N. M. Merzlyakova ◽  
S. I. Orlov ◽  
B. O. Bologdin ◽  
V. I. Ural'skii ◽  
...  
Keyword(s):  
Hydrodynamic Friction ◽  
Friction Regime

Hydrodynamic Friction in Elliptical and Circular Point Contacts

1974 ◽  
Vol 16 (4) ◽  
pp. 243-249 ◽  
Author(s):  
N. Thorp ◽  
R. Gohar
Keyword(s):  
Drive Shaft ◽  
Hydrodynamic Theory ◽  
Experimental Measurements ◽  
Point Contacts ◽  
Hydrodynamic Friction ◽  
Circular Groove ◽  
Circular Point ◽  
The Asymmetry

Hydrodynamic friction in undistorted, concentrated point contacts is studied. Experimental measurements are obtained using a ball-and-plate machine, the plate being either flat, or with a circular groove. In the latter case, the ball drive-shaft is angled to vary the asymmetry of the contact. Reasonable correlation with experiment is obtained using a hydrodynamic theory which embraces the rolling, sliding and cavitation components of the total friction.

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