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A two-way FSI analysis of multiphase flow in hydrodynamic journal bearing with cavitation

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Journal of the Brazilian Society of Mechanical Sciences and Engineering Aims and scope Submit manuscript

Abstract

This work deals with a study of a three-dimensional CFD analysis and multi-phase flow phenomena for hydrodynamic journal bearing with integrated cavitation. The simulations are carried out considering the realistic bearing deformations by two-way fluid–structure interactions (FSI) along with cavitation using ANSYS®Workbench software. The design optimization module is used to generate the optimized solution of the attitude angle and eccentricity for the combination of operating speed and load. Bearings with and without cavitation are investigated. A drop in maximum pressure value is observed when cavitation is considered in the bearing. The rise in oil vapor distribution is noted with an increase in shaft speed which lowers the magnitude of the pressure build up in the bearing. The bearing deformations are analyzed numerically and found increasing with an increase in shaft speed. The experimental data obtained for pressure distribution showed good agreement with numerical data along with a considerable reduction in computation time.

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Abbreviations

e :

Eccentricity between shaft and bearing, m

C :

Radial clearance, m

R :

Radius of the shaft, m

h :

Film thickness, m

ω :

Angular velocity, rad/sec

W :

Load carrying capacity, N

O’:

Bearing centre

O:

Shaft centre

ρ :

Fluid density, kg/m3

ρ l :

Liquid density, kg/m3

ρ v :

Vapor density, (kg/m3)

\(\vec{v}\) :

Fluid velocity

P :

Static pressure, Pa

\(\overline{\overline{\tau }}\) :

Stress tensor

\(\vec{F}\) :

External body force, N

t :

Time

ε :

Eccentricity ratio

σ :

Liquid surface tension coefficient

\(\vec{v}\) :

Fluid velocity vector

C e, C c :

Mass transfer source terms connected to the growth and collapse of the vapor bubbles, respectively

\(F_{{_{{{\text{cond}}\,}} }}\) :

Condensation coefficient

F evap :

Evaporation coefficient

p v :

Saturation pressure of the fluid

[M s]:

Structural mass matrix

[M f]:

Fluid mass matrix

[F s]:

Structural force matrix

[F f]:

Fluid force matrix

[R]:

Coupling matrix

Δh :

Relative rigid displacement of the two bearing surfaces

δ :

Total elastic deformation of the shaft and bearing system

p b :

Bubble surface pressure

\(\overline{\overline{I}}\) :

Unit tensor

μ :

Fluid viscosity, Pa-s

R b :

Bubble radius, m

\(a_{\text{nue}}\) :

Nucleation site volume fraction

p :

Local pressure

θ :

Angular coordinate

ϕ :

Attitude angle

L :

Length of the bearing

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Authors and Affiliations

  1. Department of Mechanical Engineering, AISSMS College of Engineering, Pune, Maharashtra, 411001, India

    D. Y. Dhande

  2. Department of Mechanical Engineering, College of Engineering, Pune, Maharashtra, 411005, India

    D. W. Pande

Authors
  1. D. Y. Dhande
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  2. D. W. Pande
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Correspondence to D. Y. Dhande.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Technical Editor: Jader Barbosa Jr..

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Dhande, D.Y., Pande, D.W. A two-way FSI analysis of multiphase flow in hydrodynamic journal bearing with cavitation. J Braz. Soc. Mech. Sci. Eng. 39, 3399–3412 (2017). https://doi.org/10.1007/s40430-017-0750-8

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