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Multiphysics Cavitation Model With A...

Clifford, Elizabeth J.,

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Multiphysics Cavitation Model With Application to Self-Circulating Journal Bearings /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Multiphysics Cavitation Model With Application to Self-Circulating Journal Bearings // Elizabeth J Clifford.
Author:	Clifford, Elizabeth J.,
Description:	1 electronic resource (203 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
Contained By:	Dissertations Abstracts International85-11B.
Subject:	Engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31311835
ISBN:	9798382323374

Multiphysics Cavitation Model With Application to Self-Circulating Journal Bearings /
Clifford, Elizabeth J.,

Multiphysics Cavitation Model With Application to Self-Circulating Journal Bearings /Elizabeth J Clifford. - 1 electronic resource (203 pages)

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

A physics-based gaseous cavitation model for a self-circulating bearing is proposed. Bearing applications often require external pumping systems to provide the necessary amount of lubricant for load carrying capacity and thermal management to maintain safe and continuous operation. A self-circulating bearing replaces the commonly used external pumping system to carry away used and heated lubricant away from the system with a wrap-around passive reservoir. A stationary porous bushing allows for the heated lubricant to flow from the bearing clearance through to the passive reservoir, where fluid can cool before being pulled back into the working zone. The eccentric shaft generates the pressure difference needed to ensure the fluid circulates naturally between these two regions. The self-circulating system will extend life expectancy of bearings in complex installations where monitoring and repair are difficult.The stationary porous bushing was modeled with a novel closed form solution resulting from a superposition solution to the 3D Laplace equation. The passive reservoir was simplified to be a pressure distribution found in previous experimental work to be representative of the reservoir's behavior. The flow from the porous bushing into the bearing clearance was represented by Darcy's law. Due to the laminar flow within the bearing, the fluid inertia and shear between the bushing and fluid were assumed negligible. Increasing the permeability of the bushing decreased the load capacity.The Raleigh-Plesset-Scriven model for cavitation was used to update lubricant properties within the two-phase fluid of oil and air. The effect of allowing for the fluid to withstand tension was compared to simpler cavitation models: the load capacity of the bearing decreased. One of the stated advantages of the self-circulation bearing is the heat dissipation from the working fluid. A thin film energy equation was applied to study the temperature effects on the fluid throughout the simulation. Comparison between a solid and self-circulating bearing with equal heat transfer coefficients confirmed that a self-circulating bearing lowered the temperature of the lubricant. The novel model developed incorporated bubble dynamics and thin film energy which allowed for proper simulation of a self-circulating bearing. The numerical model allowed for investigation of the effects of changing permeability, bushing thickness, and speed on the temperature, pressure, and cavitation of the fluid.

English

ISBN: 9798382323374Subjects--Topical Terms:

586835
Engineering.
Subjects--Index Terms:

Self-circulating bearing

Multiphysics Cavitation Model With Application to Self-Circulating Journal Bearings /
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100 1 $a Clifford, Elizabeth J., $e author. $3 3829957
245 1 0 $a Multiphysics Cavitation Model With Application to Self-Circulating Journal Bearings / $c Elizabeth J Clifford.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (203 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
500 $a Advisors: Garafolo, Nicholas G. Committee members: Daniels, Christopher C.; Felicelli, Sergio; Wilber, J. Patrick; Evans, Edward A.; Suryanarayanan, Saikishan.
502 $b Ph.D. $c The University of Akron $d 2024.
520 $a A physics-based gaseous cavitation model for a self-circulating bearing is proposed. Bearing applications often require external pumping systems to provide the necessary amount of lubricant for load carrying capacity and thermal management to maintain safe and continuous operation. A self-circulating bearing replaces the commonly used external pumping system to carry away used and heated lubricant away from the system with a wrap-around passive reservoir. A stationary porous bushing allows for the heated lubricant to flow from the bearing clearance through to the passive reservoir, where fluid can cool before being pulled back into the working zone. The eccentric shaft generates the pressure difference needed to ensure the fluid circulates naturally between these two regions. The self-circulating system will extend life expectancy of bearings in complex installations where monitoring and repair are difficult.The stationary porous bushing was modeled with a novel closed form solution resulting from a superposition solution to the 3D Laplace equation. The passive reservoir was simplified to be a pressure distribution found in previous experimental work to be representative of the reservoir's behavior. The flow from the porous bushing into the bearing clearance was represented by Darcy's law. Due to the laminar flow within the bearing, the fluid inertia and shear between the bushing and fluid were assumed negligible. Increasing the permeability of the bushing decreased the load capacity.The Raleigh-Plesset-Scriven model for cavitation was used to update lubricant properties within the two-phase fluid of oil and air. The effect of allowing for the fluid to withstand tension was compared to simpler cavitation models: the load capacity of the bearing decreased. One of the stated advantages of the self-circulation bearing is the heat dissipation from the working fluid. A thin film energy equation was applied to study the temperature effects on the fluid throughout the simulation. Comparison between a solid and self-circulating bearing with equal heat transfer coefficients confirmed that a self-circulating bearing lowered the temperature of the lubricant. The novel model developed incorporated bubble dynamics and thin film energy which allowed for proper simulation of a self-circulating bearing. The numerical model allowed for investigation of the effects of changing permeability, bushing thickness, and speed on the temperature, pressure, and cavitation of the fluid.
546 $a English
590 $a School code: 0003
650 4 $a Engineering. $3 586835
650 4 $a Mechanical engineering. $3 649730
650 4 $a Mechanics. $3 525881
650 4 $a Fluid mechanics. $3 528155
653 $a Self-circulating bearing
653 $a Cavitation models
653 $a Journal bearing
653 $a Pseudo cavitation
653 $a Porous bushing
690 $a 0537
690 $a 0548
690 $a 0346
690 $a 0204
710 2 $a The University of Akron. $b Mechanical Engineering. $e degree granting institution. $3 3829958
720 1 $a Garafolo, Nicholas G. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 85-11B.
790 $a 0003
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31311835