Closure to Discussion of “A General Model for Liquid and Gas Lubrication, Including Cavitation” (Brunetiere, N., 2018, ASME J. Tribol., 140(2), p. 021702)

Brunetière, Noël; Cochain, Jérémy

doi:10.1115/1.4039798

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…23 Nau first experimentally observed the cavitation phenomenon of liquid film on a mechanical seal face. 24 To model the cavitation process, Brunetie`re derived a general formulation of the Reynolds equation for gas and liquid lubricant of mechanical seal, including the cavitation phenomenon, 25 which was capable of continuous description of cavitation in liquid lubricant. For the aspect of flow field from the radial direction, tip-leakage vortex (TLV) cavitation might also be a challenge in the mechanical seal.…”

Section: Introductionmentioning

confidence: 99%

Thermo-viscous influence on the mechanical seal performance in a reactor coolant pump (RCP)

Wang

et al. 2023

Advances in Mechanical Engineering

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The mechanical seal performance in reactor coolant pump (RCP) is of great importance for the efficient and safe operation of primary loop in nuclear power plant. The sealing medium filling inside the seal encounters strong thermal gradient. In this paper, thermo-viscous effect on sealing characteristics with two typical mechanical seal faces, namely the tapered-end-face and wave-tilt-dam, is numerically studied, by introducing the temperature-viscosity equation according to the real physical properties of the sealing medium. Performance of mechanical seal with two different temperature-viscosity equations are compared. In addition, the influence of thermo-viscous effect on cavitation is also analyzed. It is revealed that the temperature-viscosity variation significantly influences the internal flow field, temperature field, two-phase distribution, and the opening force as well. With low base film thickness, the temperature difference will reduce 58% as considering the thermal effect on viscosity, and the difference in leakage may be as high as 43%. Also, the prediction of cavitation under small film thickness indicates that the thermo-viscous effect decreases the cavitating area. This work contributes to the mechanical seal design and performance prediction by assessing the thermal influences on viscosity of seal medium, and meanwhile revealing the effect on the possible cavitation event.

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Section: Introductionmentioning

confidence: 99%

Thermo-viscous influence on the mechanical seal performance in a reactor coolant pump (RCP)

Wang

et al. 2023

Advances in Mechanical Engineering

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Closure to Discussion of “A General Model for Liquid and Gas Lubrication, Including Cavitation” ((Brunetière, N., 2018, ASME J. Tribol., 140(2), p. 021702))

Brunetière

2018

Journal of Tribology

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Simulation of Air Ingestion in a Mechanical Seal With Inward Pumping Spiral Grooves

Medjahed,

Blouin,

Pap

et al. 2023

Journal of Tribology

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Inward pumping spiral groove seals are used in many applications, such as transmission gear boxes or electric vehicles, as they can provide zero leakage and very low operating friction. The spiral grooves are connected to the low pressure side (typically atmosphere) and pump the fluid inward that is to say toward the high pressure side (inlet). If the rotational speed is high enough, the low pressure fluid (air) completely occupies the sealing area and is used as a low friction lubricant. However, for lower operating speeds or higher fluid pressures, the seal can be lubricated by both fluids simultaneously. This occurs particularly during start-up and shut down. In this work a numerical simulation of the two phases in the sealing gap of an upstream pumping spiral groove seal during start-up is performed. The establishment of the film is analyzed and the effect of the rotational speed and operating pressure on the fluid composition (air and liquid) in the sealing interface is studied. For the analyzed seal, it is shown that the amount of air pumped in the sealing area is controlled by the duty parameter.

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Closure to Discussion of “A General Model for Liquid and Gas Lubrication, Including Cavitation” (Brunetiere, N., 2018, ASME J. Tribol., 140(2), p. 021702)

Cited by 3 publications

References 3 publications

Thermo-viscous influence on the mechanical seal performance in a reactor coolant pump (RCP)

Thermo-viscous influence on the mechanical seal performance in a reactor coolant pump (RCP)

Closure to Discussion of “A General Model for Liquid and Gas Lubrication, Including Cavitation” ((Brunetière, N., 2018, ASME J. Tribol., 140(2), p. 021702))

Simulation of Air Ingestion in a Mechanical Seal With Inward Pumping Spiral Grooves

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