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Modeling of Partially Wetting Liquid Film Using an Enhanced Thin Film Model for Aero-Engine Bearing Chamber Applications

Singh, Kuldeep; Sharabi, Medhat; Jefferson-Loveday, Richard; Ambrose, Stephen; Eastwick, Carol; Cao, Jing; Jacobs, Adrian

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Authors

Dr KULDEEP SINGH KULDEEP.SINGH@NOTTINGHAM.AC.UK
Senior Application Engineers Inindustrialisation of Electrical Machines

Medhat Sharabi

Richard Jefferson-Loveday

CAROL EASTWICK CAROL.EASTWICK@NOTTINGHAM.AC.UK
Professor of Mechanical Engineering

Jing Cao

Adrian Jacobs



Abstract

In the case of aero-engine, thin lubricating film servers dual purpose of lubrication and cooling. Prediction of dry patches or lubricant starved region in bearing or bearing chambers are required for safe operation of these components. In this work, thin liquid film flow is numerically investigated using the framework of the Eulerian thin film model (ETFM) for conditions, which exhibit partial wetting phenomenon. This model includes a parameter that requires adjustment to account for the dynamic contact angle. Two different experimental data sets have been used for comparisons against simulations, which cover a wide range of operating conditions including varying the flowrate, inclination angle, contact angle, and liquid–gas surface tension coefficient. A new expression for the model parameter has been proposed and calibrated based on the simulated cases. This is employed to predict film thickness on a bearing chamber which is subjected to a complex multiphase flow. From this study, it is observed that the proposed approach shows good quantitative comparisons of the film thickness of flow down an inclined plate and for the representative bearing chamber. A comparison of model predictions with and without wetting and drying capabilities is also presented on the bearing chamber for shaft speed in the range of 2500 RPM to 10,000 RPM and flowrate in the range of 0.5 liter per minute (LPM) to 2.5 LPM.

Journal Article Type Article
Acceptance Date Sep 7, 2020
Online Publication Date Feb 8, 2021
Publication Date Apr 1, 2021
Deposit Date Mar 3, 2021
Publicly Available Date Feb 9, 2022
Journal Journal of Engineering for Gas Turbines and Power
Print ISSN 0742-4795
Electronic ISSN 1528-8919
Publisher American Society of Mechanical Engineers
Peer Reviewed Peer Reviewed
Volume 143
Issue 4
Article Number 041001
DOI https://doi.org/10.1115/1.4049663
Keywords Fuel Technology; Mechanical Engineering; Energy Engineering and Power Technology; Nuclear Energy and Engineering; Aerospace Engineering
Public URL https://nottingham-repository.worktribe.com/output/5364603
Publisher URL https://asmedigitalcollection.asme.org/gasturbinespower/article/143/4/041001/1095472/Modeling-of-Partially-Wetting-Liquid-Film-Using-an

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