Analytical Investigation of the Spiral Groove Face Seal

1973 ◽  
Vol 95 (4) ◽  
pp. 499-510 ◽  
Author(s):  
H. J. Sneck ◽  
J. F. McGovern
Keyword(s):  
Mathematical Model ◽  
Parametric Design ◽  
Analytical Investigation ◽  
Performance Characteristics ◽  
Comprehensive Model ◽  
Inertial Effects ◽  
Face Seal ◽  
Spiral Groove ◽  
Design Studies

An analytical investigation of both a simplified and a comprehensive mathematical model of a spiral groove face seal, using the “narrow seal” approximation. The sealing fluid is assumed to be incompressible and Newtonian. The inertial effects associated with seal curvature are incorporated in the comprehensive model. The results of the analysis are programmed for computer computation in order to facilitate their application in parametric design studies. Performance characteristics are calculated for some particular seal designs.

scholarly journals Influence of Nano-Fluid Lubrication On Single Porous-Layered Journal Bearing: A Hypothetical Approach

2021 ◽  
Author(s):  
BIPLAB BHATTACHARJEE ◽  
PRASUN CHAKRABORTI ◽  
KISHAN CHOUDHURY
Keyword(s):  
Mathematical Model ◽  
Boundary Conditions ◽  
Micropolar Fluid ◽  
Journal Bearing ◽  
Performance Characteristics ◽  
Published Data ◽  
Nano Fluid ◽  
Nano Lubricant ◽  
Output Characteristics ◽  
Modified Darcy’S Law

Abstract In this article a mathematical model of single layered nano-fluid lubricated PJB (porous journal bearing) has been formulated. The nano-lubricant's impact on the efficiency of said journal bearing has been studied using modified Darcy's law and boundary conditions. The different nanoparticles often used as an additive in industrial lubricating oils improve their viscosity significantly. The brief description of dimensionless performance characteristics of the investigated bearing was obtained by the use of the nano-lubricant's modified Krieger-Dougherty viscosity model. The observations revealed that the output characteristics are substantially improved by using nano-lubricant. The present study was validated by comparing the findings of recently published data with micropolar fluid and was found to be completely compatible since data with nano-lubricant are still unavailable.

DEVELOPMENT OF A METHOD FOR OPTIMAL PLACEMENT OF ELEMENTS ON THE SWITCHING FIELD OF THE PRINTING UNIT IN ORDER TO PROVIDE THE SPECIFIED THERMAL MODES OF RADIO ELECTRONIC MEANS

2020 ◽  
pp. 37-47
Author(s):  
Zang Wang Thanh ◽  
S.U. Uvajsov ◽  
V.V. Chernoverskaya
Keyword(s):  
Electronic Devices ◽  
Electronics Industry ◽  
Performance Characteristics ◽  
Optimal Placement ◽  
Switching Field ◽  
Stages Of Development ◽  
Technical Design ◽  
Design Studies ◽  
Printed Circuit ◽  
Quality And Reliability

Currently technical design is one of the most important stages of development and production of electronic tools that are widely used in the electronics industry. At the stage of design studies in the framework of solving the problem of improving the quality and reliability of electronic devices manufactured in the form of printed circuit assemblies (PU), receive a constructive implementation and the main performance characteristics of future products.

Spiral Groove Face Seal Behavior and Performance in Liquid Lubricated Applications

2018 ◽  
Vol 61 (6) ◽  
pp. 1048-1056 ◽  
Author(s):  
Mathieu Rouillon ◽  
Noël Brunetière
Keyword(s):  
Face Seal ◽  
Spiral Groove ◽  
And Performance

scholarly journals Metachronal Swimming with Rigid Arms near Boundaries

Fluids ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 24 ◽  
Author(s):  
Rintaro Hayashi ◽  
Daisuke Takagi
Keyword(s):  
Mathematical Model ◽  
Stokes Flow ◽  
Experimental System ◽  
Phase Delay ◽  
Slender Body ◽  
Inertial Effects ◽  
Slender Body Theory ◽  
Measured Displacement ◽  
Body Theory ◽  
Over Time

Various organisms such as crustaceans use their appendages for locomotion. If they are close to a confining boundary then viscous as opposed to inertial effects can play a central role in governing the dynamics. To study the minimal ingredients needed for swimming without inertia, we built an experimental system featuring a robot equipped with a pair of rigid slender arms with negligible inertia. Our results show that directing the arms to oscillate about the same time-averaged orientation produces no net displacement of the robot each cycle, regardless of any phase delay between the oscillating arms. The robot is able to swim if the arms oscillate asynchronously around distinct orientations. The measured displacement over time matches well with a mathematical model based on slender-body theory for Stokes flow. Near a confining boundary, the robot with no net displacement every cycle showed similar behavior, while the swimming robot increased in speed closer to the boundary.

The Effects of Geometry and Inertia on Face Seal Performance—Turbulent Flow

1968 ◽  
Vol 90 (2) ◽  
pp. 342-350 ◽  
Author(s):  
H. J. Sneck
Keyword(s):  
Laminar Flow ◽  
Turbulent Flow ◽  
Velocity Distribution ◽  
Power Law ◽  
Apparent Viscosity ◽  
Lubrication Theory ◽  
Inertial Effects ◽  
Face Seal ◽  
Geometric Deviations ◽  
The Ideal

The “short bearing” equation of lubrication theory, modified to include the inertial effects, is used to study the influence of geometric deviations from the ideal. The turbulent nature of the flow is described by an isotropic apparent viscosity and a power-law velocity distribution. It is found that geometric deviations from the ideal are less influential than in laminar flow.

Diffusive, Electrostatic, and Gravitational Deposition of Suspensions in the Entrance of a Nozzle

1983 ◽  
Vol 50 (1) ◽  
pp. 1-7
Author(s):  
T. A. Korjack
Keyword(s):  
Mathematical Model ◽  
Brownian Motion ◽  
Laminar Flow ◽  
Gravity Field ◽  
Deposition Rate ◽  
Flow Parameter ◽  
Deposition Process ◽  
Electrostatic Charge ◽  
Analytical Investigation ◽  
Nozzle Inlet

An analytical investigation of the mechanics of deposition affected by gravity, electrostatic charge, and Brownian motion in an effuser from the nozzle inlet to a distance where incompressible effects are still valid has been made and a mathematical model developed for the deposition process. The analysis was restricted to laminar flow of dilute, nonreactive suspensions contained within an incompressible, viscous carrier. The results show that increasing the nozzle angle causes a decrease in deposition rate regardless of the diffusive Peclet number and gravity flow parameter. Furthermore, an increase in gravity field causes an increase in bottom deposition rate and decrease in top deposition rate.

A Model for Flow Distribution in Manifolds

1971 ◽  
Vol 93 (1) ◽  
pp. 7-12 ◽  
Author(s):  
R. A. Bajura
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Analytical Model ◽  
Distribution Systems ◽  
Numerical Solutions ◽  
Flow Behavior ◽  
Flow Distribution ◽  
Analytical Investigation ◽  
Momentum Balance ◽  
Distribution Equation

An analytical investigation of the performance of flow distribution systems was conducted for both intake and exhaust manifolds. Primary emphasis was placed on configurations in which the lateral tubes formed sharp-edged junctions at right angles to the manifold axis. A mathematical model describing the flow behavior at a discreet branch point was formulated in terms of a momentum balance along the manifold. The model was extended to the case of continuous discharge or intake for a uniformly porous manifold. Numerical solutions of the governing flow distribution equation were obtained and compared with experimental data. Dimensionless parameters characterizing the performance of manifolds were formulated from the analytical model.

Behavior of Hydrostatic and Hydrodynamic Noncontacting Face Seals

1968 ◽  
Vol 90 (2) ◽  
pp. 510-519 ◽  
Author(s):  
H. S. Cheng ◽  
C. Y. Chow ◽  
D. F. Wilcock
Keyword(s):  
Large Diameter ◽  
Initial Imperfection ◽  
Static Stability ◽  
Compressible Fluids ◽  
Face Seal ◽  
Spiral Groove ◽  
Design Data ◽  
Dynamic Tracking ◽  
Face Seals ◽  
Groove Seal

In this paper, the pressure generation and static stability of face-type seals are discussed and an expression is developed to estimate the effectiveness of hydrodynamic action in these seals. Some design data are presented for the hydrostatic step seal, hydrostatic-orifice compensated seal, hybrid spiral-groove seal, and the shrouded Rayleigh step seal. These data are applicable to large-diameter seals for compressible fluids. The seal ring distortions due to initial imperfection, pressure, and thermal expansion are discussed. Approaches to estimate and to minimize the effects of these distortions are outlined. Finally, the ability of a face seal to track the vibrations of the runner is also discussed and methods required to determine the dynamic tracking for rigid or flexible seals are described.

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