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  • AIP Publishing  (5)
  • 1
    Online Resource
    Online Resource
    Experimental investigation of disc partial surface texture on the generation of hydrodynamic lubricating performance under conformal contact condition
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 12 ( 2018-12-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 12 ( 2018-12-01)
    Abstract: A series of experiments is conducted to investigate the hydrodynamic lubricant characteristics of partial surface textured specimens. The specimens are fabricated with partial surface texture. Two dimple shapes are adopted: circular and elliptic. Four kinds of texture arrangements of elliptic dimples are designed. During each test, different rotating speeds and gaps between the tested specimen and the geometric probe are set to explain the relationship between the operation condition and load-carrying capacity. We found that the load-carrying capacity is strongly affected by the operation condition, i.e. by both speed and gap. The surface textured specimens generate large hydrodynamic lift force compared with the untextured specimen. In addition, the texture arrangements exhibit a significant impact on the lubrication property.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5056192
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Lateral traction of laminar flow between sliding pair with heterogeneous slip/no-slip surface
    AIP Publishing ; 2017
    In:  AIP Advances Vol. 7, No. 11 ( 2017-11-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 7, No. 11 ( 2017-11-01)
    Abstract: The problem of shaft axial motion which significantly affects the lubrication performance has been a common phenomenon in journal bearing systems. The existing work involved in the solution of shaft axial motion is also very rare. In this study, we choose to examine the flow between sliding pair in which regard we present a unique heterogeneous surface consisting of a slip zone and a no-slip zone. The results reveal the following points: 1) By appropriately arranging the slip zone to change the angle between the borderline and the moving direction of the upper plate, it is possible to control the direction of the lateral traction in which the liquid film acts on the upper plate. 2) Exponent of the power function of the borderline and aspect ratio of the computational domain are large or small are not conducive to increasing the effect of lateral traction. For the object of this study, the final results of the optimization are shown that the lateral traction can account for 20% of the resistance.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5003688
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2583909-3
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  • 3
    Online Resource
    Online Resource
    The effect of energy accumulation and boundary slip on laminar flow between rotating plates
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 2 ( 2018-02-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 2 ( 2018-02-01)
    Abstract: The poor operating conditions of fluid lubrication equipment during the start-up process are due to the resistance of the high-viscosity lubricating liquid. Moreover, the excessive reduction in fluid viscosity due to the elevated temperature resulting from power consumption during prolonged operation is not conducive to the generation of dynamic pressure. In this study, we examine the effect of energy accumulation and boundary slip on the laminar flow of a liquid between a pair of rotating plates. The experiments are conducted using a rotary rheometer, with polymethyl methacrylate (PMMA) as the thermal insulation material and polytetrafluoroethylene (PTFE) as the slip drag reduction material, and a three-dimensional simulation model is established. This model is derived by combining the energy equation including the slip length and the heat conduction equation. Thus, the temperature changes over time are predicted by this model, and the model accuracy is verified by experiments. The results reveal the following points: 1) boundary slips function as a drag reduction mechanism for short-time continuous operation; 2) under prolonged operation, the slip reduces the extent of the oil viscosity decrease and clear control of the elevated temperature by the boundary slip is observed.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5020322
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 4
    Online Resource
    Online Resource
    Elastohydrodynamic lubrication in point contact on the surfaces of particle-reinforced composite
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 4 ( 2018-04-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 4 ( 2018-04-01)
    Abstract: Appreciable friction and serious wear are common challenges in the operation of advanced manufacturing equipment, and friction pairs may be susceptible to damage even with oil lubrication when point contact exists. In this study, a type of particle-reinforced composite material is introduced for one of the components of a heavy-load contact pair, and the performance improvement of elastohydrodynamic lubrication (EHL) is analyzed considering the rheological properties of non-Newtonian fluids. The Ree–Eyring EHL model is used considering the surface of the particle-reinforced composite, in which the film thickness includes the particle-induced elastic deformation. The problem of inclusions with different eigenstrains is solved by using Galerkin vectors. The influences of particle properties, size, burial depth, and interparticle distance on point-contact EHL are investigated. Furthermore, using several cases, the structural parameters of the particles in the composites are optimized, and an appropriate parameter range is obtained with the goal of reducing friction. Finally, the results for the EHL traction coefficient demonstrate that appropriate particle properties, size, burial depth, and interparticle distance can effectively reduce the traction coefficient in heavy-load contact.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5020697
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 5
    Online Resource
    Online Resource
    Research on steam flow excited vibration of nuclear power condenser based on full three-dimensional numerical simulation technology
    AIP Publishing ; 2022
    In:  AIP Advances Vol. 12, No. 3 ( 2022-03-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 12, No. 3 ( 2022-03-01)
    Abstract: Numerical calculation is regarded as the most effective research method for studying problems about a condenser due to the experimental difficulty caused by the huge size. However, almost all numerical research studies about condensers are two-dimensional, which severely reduce the reliability of the research about a three-dimensional problem. In this case, a full three-dimensional computational fluid dynamics (CFD) method based on a porous medium model was first used to study the seawater leakage event in a condenser. The steam flow field of the condenser under a series of operation conditions was obtained. The distribution of a risk coefficient of steam flow excited vibration (SFEV) was obtained as well. The results show that the sweep velocity of steam across a titanium tube was the primary factor determining the risk coefficient of SFEV. The risk of SFEV of the outer layer in the upper finger joint region is relatively high. It is necessary to install anti-abrasive strips or implement preventive tube plugging. According to the calculated results, the recommended values of electric power limits for a nuclear power unit were given, which was 840 MW under half-side condenser operation conditions in summer. Through comparing the simulated flow field before and after tube plugging, it is found that local tube plugging in the high-risk area will transfer the position of the high-risk point of SFEV.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0078018
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2583909-3
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