Appearance of Hysteresis Phenomena on Hydrodynamic Lubrication in a Seal-Type Thrust Bearing with Dimples

Miwa, Reo; Miyanaga, Norifumi; Tomioka, Jun

doi:10.3390/ma14185222

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…Fig. 1 shows a schematic of the experimental apparatus used in this study [4][5]. The thrust bearing consists of an upper glass disk and a dimpled brass specimen.…”

Section: Methodsmentioning

confidence: 99%

Effect of Cross-Sectional Profile of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

Ishii,

Miwa,

Miyanaga

et al. 2023

J. Mater. Eng.

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The effects of three types of dimples with different internal structures on the fluid lubrication characteristics of thrust bearings were investigated. The load-carrying capacity and the frictional torque were measured. The measurements were performed with a fixed constant film thickness. The behaviours of cavitation bubbles occurred within the dimple were observed through the rotating glass plate. Three types of internal structures of dimples were tested: cylindrical, sphere and conical. The measurement results were simulated by the Reynolds equation. As the results, the load-carrying capacity increased as the rotational speed increased. The cylindrical internal structure built up the largest pressure at the trailing edge, and consequently the largest load-carrying capacity. The frictional torque also increased with increasing the rotational speed. However, the effect of the internal structure on the frictional torque was not significant.

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“…Fig. 1 shows a schematic of the experimental apparatus used in this study [4][5]. The thrust bearing consists of an upper glass disk and a dimpled brass specimen.…”

Section: Methodsmentioning

confidence: 99%

Effect of Cross-Sectional Profile of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

Ishii,

Miwa,

Miyanaga

et al. 2023

J. Mater. Eng.

View full text Add to dashboard Cite

show abstract

“…Fig. 1 shows a schematic of the experimental apparatus used in this study [24][25][26]. The thrust bearing consists of an upper glass disk and a dimpled brass specimen.…”

Section: Experiments 21 Experimental Apparatusmentioning

confidence: 99%

“…To overcome this difficulty, the authors newly developed an experimental apparatus in which the frictional torque, LCC, and cavitation area ratio in the dimples could be measured while maintaining a constant oil-film thickness [24]. Using this device, the hysteresis characteristics of the LCC caused by cavitation bubbles were clarified in a previous study [25]. In addition, the measurement results using this device were compared with the experimental results under a constant load, which is considered common practice.…”

Section: Introductionmentioning

confidence: 99%

Effect of Internal Structure of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

Ishi,

Miwa,

Miyanaga

et al. 2023

Tribol. Ind.

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In this study, the effects of three types of dimples with different internal structures on the fluid lubrication characteristics of seal-like thrust bearings were experimentally and numerically investigated. In the experiments, the load-carrying capacity and the frictional torque were measured. The measurements were performed with a fixed constant film thickness. The behaviors of cavitation bubbles occurred within the dimples were observed through the rotating glass plate. Three types of internal structures of dimples were tested: cylindrical, spherical and conical. The measurement results were simulated by using the Reynolds equation. In addition, applying the periodic condition, a single dimple was analyzed. As the results, in three types of dimples, the load-carrying capacity increased as the rotational speed increased. The cylindrical internal structure built up the largest pressure at the trailing edge of dimples, and consequently the largest load-carrying capacity. The frictional torque also increased with increasing the rotational speed in the dimpled bearings. However, the effect of the internal structure on the frictional torque was not significant. Analytical results showed that the pressure reached the maximum value at the trailing edge of the cylindrical internal structure. The conical and sphere internal structure had the maximum value slightly inside the trailing edge.

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“…After that, researchers used both numerical simulations and experimental methods to study mechanical face seals with spiral grooves, T-grooves or inclined elliptical grooves [14][15][16][17][18][19][20][21]. The results showed that good dynamic pressure characteristics and friction characteristics could be obtained under the liquid lubrication condition, indicating that the structure of the inclined elliptical grooves had a better pumping effect than that of the spiral grooves.…”

Section: Introductionmentioning

confidence: 99%

Gas–Liquid Mass Transfer Behavior of Upstream Pumping Mechanical Face Seals

et al. 2022

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For gas–liquid medium isolation seals in aero-engines, the upstream pumping function of directional grooves provides an effective way to realize the design of longer service life and lower leakage rate. However, this produces a new problem for gas–liquid mass transfer in the sealing clearance. This study establishes an analytical model to investigate the gas–liquid mass transfer behavior and the change rule for the opening force of mechanical face seals with elliptical grooves. Compared with traditional studies, this model considers not only the gas–liquid transfer but also the cavitation effect. The results obtained show that with the increase of rotational speed, the gas medium transferred from the inner low-pressure side to the outer high-pressure side. In addition, the leakage rate of the liquid medium from the outer high-pressure side to the inner low-pressure side increased with the growth of sealing clearance, rotational speed and seal pressure. The upstream pumping effect of the gas medium with elliptical grooves not only led to a state of gas–liquid mixed lubrication in the sealing surfaces, but also significantly increased the opening capacity of the seal face. This research may provide a reasonable basis for the design of upstream pumping mechanical face seals.

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Appearance of Hysteresis Phenomena on Hydrodynamic Lubrication in a Seal-Type Thrust Bearing with Dimples

Cited by 5 publications

References 22 publications

Effect of Cross-Sectional Profile of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

Effect of Cross-Sectional Profile of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

Effect of Internal Structure of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

Gas–Liquid Mass Transfer Behavior of Upstream Pumping Mechanical Face Seals

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