Effects of Laminar, Turbulent, and Slip Conditions in a Fluid Film on a Dry Gas Seal

Hahn, Mibbeum; Park, Youngjun; Kang, Minsoo; Jun, Sanghyun; Jang, Gunhee

doi:10.3390/machines10100954

Cited by 3 publications

(8 citation statements)

References 19 publications

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“…On the other hand, Ng-Pan proposed a turbulent compressible Reynolds equation that includes turbulent effect in the compressible Reynolds equation [16,17], and Fukui-Kaneko proposed a modified Reynolds equation that includes the slip effect [18,19]. Recently, Han et al [1] defined fluid state coefficients according to fluid flow to consider laminar, turbulent, and slip conditions, and proposed a modified Reynolds equation considering laminar, turbulent, and slip conditions as follows:…”

Section: Methods Of Analysismentioning

confidence: 99%

“…In Table 1, G r , G θ , and q p are radial turbulent coefficient, circumferential turbulent coefficient, and slip coefficient defined in Equations ( 2)-( 4), and Table 2 [1,[16][17][18][19][20][21][22][23][24]:…”

Section: Methods Of Analysismentioning

confidence: 99%

“…z , p . Equation ( 10) is, in fact, the modified Reynolds equation in Equation (1). A finite element equation of the Reynolds equation can be obtained by multiplying Equation (10) with the weighting function and integrating using Green's theorem:…”

Section: Methods Of Analysismentioning

confidence: 99%

“…The closing force is generated by the outer pressure of the working fluid. As Han et al showed, the fluid in the gap can be laminar, turbulent or in slip conditions depending on the operating condition and design variables [1]. The behavior of a fluid film can be defined as laminar or turbulent, depending on the Reynolds number (Re = ρUh/µ), and as slip or non-slip, depending on the Knudsen number (Kn = µ √ 0.5πRT/hp), where µ, ρ, U, h, R, T, and p represent the viscosity coefficient, density, fluid velocity, fluid film thickness, gas constant, temperature, and pressure of the fluid film, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Laminar, Turbulent and Slip Conditions on the Dynamic Coefficients of a Dry Gas Seal

2023

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The dynamic coefficients of a dry gas seal affect the dynamic characteristics of rotor-seal systems. Fluid films in a dry gas seal can be laminar, turbulent or with slip conditions, according to various operating conditions and design parameters. They can be defined as laminar or turbulent, depending on the Reynolds number, and as slip or non-slip, depending on the Knudsen number. However, previous research did not consider the effect of laminar, turbulent and slip conditions on the dynamic coefficients of a dry gas seal. We proposed a mathematical perturbation method to calculate the dynamic coefficients of the dry gas seal according to laminar, turbulent, and slip effects. We derived the perturbed equations of the modified Reynolds equation, which includes the effects of laminar, turbulent and slip conditions. The pressure of the modified Reynolds equation was solved using the finite element method and the Newton–Raphson method, and the perturbed pressures with respect to three degrees of freedom were calculated by substituting the calculated pressure into the perturbed equations. We verified the proposed method by comparing the simulated results with prior studies. The dynamic coefficients of a T-grooved dry gas seal were investigated according to laminar, turbulent, and slip conditions in a fluid film with different clearances.

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Section: Methods Of Analysismentioning

confidence: 99%

Section: Methods Of Analysismentioning

confidence: 99%

Section: Methods Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Laminar, Turbulent and Slip Conditions on the Dynamic Coefficients of a Dry Gas Seal

2023

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“…Consequently, it has gained extensive utilization in the petroleum industry. The sealing materials for the dynamic and static rings of dry gas seals need to have sufficient strength and elastic modulus [ 1 ]. It ensures that the sealing materials can not be damaged under certain pressure, temperature, and high-speed rotation conditions and have minimal deformation and the ability to maintain sealing even under fluctuating operating conditions [ 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

Zou,

Ou,

Zhou

et al. 2024

Materials

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Silicon carbide (SiC) ceramics with high bending strength were prepared by hot pressing sintering (HPS) with yttrium aluminum garnet (Y3Al5O12, YAG) as sintering additive, and the effects of YAG content and sintering temperature on the sintering behavior, microstructure and mechanical properties of SiC ceramics were investigated in detail. The uniform distribution of YAG to form a liquid phase and the driving force provided by hot pressing sintering decrease the sintering temperature, improve the densification of SiC ceramics, and refine the crystal size. By means of suitable sintering conditions with the additional amount of YAG of 5 wt%, the sintering temperature of 1950 °C and a pressure of 30 MPa, the resultant SiC/YAG composite ceramics possesses high sintering and mechanical properties with the relative density of 98.53%, the bending strength of 675 MPa, the Vickers hardness of up to 17.92 GPa, and the elastic modulus of 386 GPa. The as-prepared SiC/YAG composite ceramics are promisingly used as the dry gas seal materials in the centrifugal compressors.

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Lubrication Analysis of a Mechanical Seal Considering the Mixed Lubricant State of Gas and Liquid During External Power Shutdown of a Reactor Cooling Pump

Park,

Hong,

Jun

et al. 2024

Lubricants

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We proposed a method to calculate the pressure, opening force, and leakage rate in a mechanical seal under the mixed lubricant state of a gas and liquid for the mechanical seal in a reactor cooling pump (RCP) during external power loss. We calculated the pressure by solving the nonlinear finite element equation composed of the linear Reynolds equation of an incompressible liquid lubricant and the nonlinear Reynolds equation of a compressible gas lubricant using the Newton–Raphson method. In addition, we calculated the temperature distribution by solving the two-dimensional energy equation utilizing the finite element method. Additionally, we included the turbulence effect in the incompressible liquid lubricant and the turbulence and slip effects in the compressible gas lubricant. The accuracy of the developed program was validated by comparing the simulated opening force and leakage rate of both the mechanical seal with the liquid lubricant and the mechanical seal with the gas lubricant with prior research. Our analysis shows that in high-temperature environments, the increase in the gas region at the lubrication surface leads to a decrease in pressure and opening force and an increase in the leakage rate. Conversely, as the outer pressure increases, the gas region decreases, resulting in an increase in pressure, opening force, and leakage rate.

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Effects of Laminar, Turbulent, and Slip Conditions in a Fluid Film on a Dry Gas Seal

Cited by 3 publications

References 19 publications

Effect of Laminar, Turbulent and Slip Conditions on the Dynamic Coefficients of a Dry Gas Seal

Effect of Laminar, Turbulent and Slip Conditions on the Dynamic Coefficients of a Dry Gas Seal

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

Lubrication Analysis of a Mechanical Seal Considering the Mixed Lubricant State of Gas and Liquid During External Power Shutdown of a Reactor Cooling Pump

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