CFD simulation of microscale flow field in spiral groove dry gas seal

Xu, Jia; Peng, Xudong; Bai, Shaoxian; Meng, Xiangkai

doi:10.1109/mesa.2012.6275564

Cited by 13 publications

(14 citation statements)

References 5 publications

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“…In order to determine fluid state more accurately, the flow factor, a is used based on work from Brunetiere et al [26]. The fluid flow is turbulent for a 41 and laminar when ao 1 [19,26]. The flow factor a is calculated as [26]:…”

Section: Flow Factormentioning

confidence: 99%

“…Shahin et al [10] studied gas seal performances using both spiral and different herringbone shape groove configurations at different rotational speed in forward and reverse rotation conditions. Jing et al [19] studies the flow on spiral groove dry gas seal in the laminar and turbulent flow regime. Shahin et al [11] performed studies with constant depth grooves and with different taper grooves.…”

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confidence: 99%

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The influence of real gas effects on the performance of supercritical CO 2 dry gas seals

Fairuz

Jahn

2016

Tribology International

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a b s t r a c tThe current work investigates dry gas seals operation with supercritical CO 2 (sCO 2 ) at two operating conditions using CFD. One close and one far from the critical point. At the operating condition far from the critical point a maximum change of 1.7% in pressure, 0.4% in temperature and 1.1% in density are observed. Contrary, closer to the critical point a maximum change of 6.5% in pressure, 6.7% in temperature and 39.5% in density are observed. These changes also influence opening force and leakage rate. Far from the critical point the maximum changes are 0.7% and 3.1%, whereas close to the critical point maximum changes of 3.4% and 10.3% are observed. The centrifugal effect plays an important role when operating with dense gases.

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Section: Flow Factormentioning

confidence: 99%

mentioning

confidence: 99%

The influence of real gas effects on the performance of supercritical CO 2 dry gas seals

Fairuz

Jahn

2016

Tribology International

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“…Most of studies of isothermal continuum fluid flow conditions in the analysis of bidirectional gas seals (Bonneau et al [6], Zirkelback [7], Xu et al [8], Shahin et al [9], Wang et al [10] and Su et al [11]). Ruan et al [12] showed that in striving to reduce leakage, a tighter seal gap should be used.…”

Section: Introductionmentioning

confidence: 99%

Thermohydrodynamics of bidirectional groove dry gas seals with slip flow

Rahmani

Rahnejat

2016

International Journal of Thermal Sciences

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International Journal of Thermal Sciences, Vol. 110, pp. 270-284, 2016, DOI: 10.1016/j.ijthermalsci.2016 AbstractThermo-hydrodynamic behaviour of bidirectional dry gas seals with trapezoidal shaped symmetric grooves is studied. A multi-physics model, coupling compressible laminar flow and heat transfer in both the fluid and the solid bodies is used in a multi-physics modelling environment. The multi-physics model also includes slip flow conditions, corresponding to relatively high Knudsen numbers, as well as the effect of asperity interactions on the opposing seal faces. A comparison of the seal performance under isothermal and thermal flow conditions shows the importance of including the thermal effects. The difference in the predicted opening force between isothermal and thermal model can exceed 2.5%, which is equivalent to a force of around 1kN. The importance of designing gas seals to operate at the minimum possible gap to reduce power losses as well as leakage from the contact is highlighted. However, it is shown that there exists a critical minimum gap, below which the power loss in the contact can abruptly increase due to asperity interactions, generating significantly increased operating temperatures. Relative depths at the triangular and middle trunk parts of the grooves ℎ Convection heat transfer coefficient ℎ , , ℎ , Convection heat transfer coefficient from outer rims of rotor and stator Thermal conductivity of the gas Thermal conductivity of seal ring material Keywords Gas temperature at the inlet (outer radius), , , Gas temperature near rotor and stator contact face surfaces Temperature of the solid wall in contact with sealing gas

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“…When the inlet pressure is approximately 0.5 MPa and the maximum rotation speed is approximately 10000 rpm, scholars in [12], [13] tend to believe that the laminar regime is more consistent with the actual flow field. However, when the pressure is approximately 4.5 MPa, some scholars in [14], [15] suggest that the actual flow field is near the turbulent regime. Generally speaking, according to [16], [17], most studies have been conducted for a laminar flow in the film.…”

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confidence: 99%

Microscale Flow Field Analysis and Flow Prediction Model Exploration of Dry Gas Seal

Wang

Huang

et al. 2020

IEEE Access

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The characteristics of high speed, high pressure, microscale, and rotating flow fields result in very complicated flow between the dynamic and static rings of a dry gas seal. In particular, the existence of a groove, dam, and weir further contribute to the uncertainty of a microscale flow field. Classically, the flow regime of pipe flow is determined based on the critical Reynolds number (Pipe model) while the rotating flow field is sometimes determined by the flow factor (Oval model). In this study, a new method was developed that can be used for prediction of flow regime of a dry gas seal rotating flow field based on a three-dimensional velocity component (Ellipsoid model). The aim was to make the given model reflect the flow regime more realistically based on the consideration of the axial velocity component. When modeling dry gas seal rotating flow fields, we showed that compared to the one-dimensional Pipe model and the two-dimensional Oval model, the three-dimensional Ellipsoid model proposed in this paper can produce more accurate results. QIONG HU received the Ph.D. degree in mechanical engineering from Nanjing Forestry University, Jiangsu, China, in 2016. She worked as an Engineer with NGC, Jiangsu, until March 2018. She has a half-year experience of studying with the Department of Mechanical Engineering, Louisiana State University. She is currently a Lecturer and teaches several professional courses of mechanical engineering with Jiangsu Ocean University, Jiangsu. She has published 14 research articles in the journals. Her research interests include fluid sealing technology, tribology, numerical simulations, and heat transfer.

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CFD simulation of microscale flow field in spiral groove dry gas seal

Cited by 13 publications

References 5 publications

The influence of real gas effects on the performance of supercritical CO 2 dry gas seals

The influence of real gas effects on the performance of supercritical CO 2 dry gas seals

Thermohydrodynamics of bidirectional groove dry gas seals with slip flow

Microscale Flow Field Analysis and Flow Prediction Model Exploration of Dry Gas Seal

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