...Anupam Bhandari The viscosity of ferrofluid has a vital role in liquid sealing of the hard disk drives, biomedical applications as drug delivery, hyperthermia, and magnetic resonance imaging. The theoretical expressions for ferrofluid viscosity and its limitation are presented in detail...

...Aashna Raj; Chiranjit Sarkar; Piyush Kumar; Manabendra Pathak This work presents an investigation of magnetohydrodynamic flow in a novel double restriction seal configuration using micro-Particle Image Velocimetry (µPIV). A conventional seal design has been modified to impart magnetic effects...

... lubrication journal bearings rotordynamic seals e ~ = eccentricity (m) h ~ = gap function (m) h ¯ ~ = mean gap height (m) p ~ = pressure (Pa) F ~ = force on the rotor (N) L...

... widely used models for calculating the characteristics of annular seals, the assumption of averaged velocity profiles is by no means uncritical [ 23 , 24 ]. Strictly speaking, the assumption is only valid when the real velocity profiles are close to block-shaped ones, i.e., Re φ → ∞. Finally...

... seals commonly serve as balance pistons in pumps while also restricting secondary flow. Prior experimental results obtained with a grooved seal operating with a mixture of air and mineral oil show the seal rotordynamic force coefficients vary significantly with the gas volume fraction (GVF). This paper...

... was adopted in order to measure the overall power loss of the axle box, as well as to isolate the power loss contribution of the major components: crown wheel, pinion, seals, and the tandem taper roller bearings supporting the pinion shaft and the crown assembly. Although it was not possible to directly...

...Xueliang Lu; Luis San Andrés; Jing Yang Seals in multiple-phase rotordynamic pumps must operate without compromising system efficiency and stability. Both field operation and laboratory experiments show that seals supplied with a gas in liquid mixture (bubbly flow) can produce rotordynamic...

...R. Goltsberg; M. Gilad This study describes an experimental investigation of the sealing performance of a metallic conical poppet and a polymeric annular seat with a round sealing edge. The experiments were carried out with nitrogen. The influence of the radius of the sealing edge and its surface...

... becomes significant. This can be explained by the increased frictional temperature in high incursion rate cases. Similar to the large specimen, the material spallation (cracking) is mainly occurred at the upstream and downstream edges. Since the labyrinth seal in steam turbines or compressors...

...Min Zhang; Dara W. Childs Hole-pattern (HP) seals are widely used in centrifugal compressors to control leakage. This paper investigates the behaviors of an HP with wet-gas mixtures. The mixture consists of oil and air with inlet liquid volume fraction (LVF) up to 8%. Injecting oil into the air...

...Lingsheng Han; Yongqing Wang; Kuo Liu; Ziyou Ban; Bo Qin; Haibo Liu; Minghua Dai Labyrinth seals are widely applied in turbomachinery for gas and liquid sealing. A series of labyrinth seal leakage equations so far have been proposed for compressible gas and few equations for incompressible liquid...

...Zhang Yan-chao; Zhou Rui-min; Yin Ming-hu; Zhang Yong-tao; Hu Hai-tao; Cui Ya-hui In order to find a good friction pair for the finger seal, the pin-on-disc friction tests matching the actual working conditions of finger seal are designed based on the performance simulation of finger seal...

...Markus Schulz; Marius Hagmayer; Matthias Baumann; Frank Bauer The function of a radial shaft seal is based on interactions between the sealing edge and the shaft counterface. To better understand these mechanisms, a look inside the sealing contact was taken. The procedure and the testing facility...

...Samia Dahite; Mihai Arghir The present work deals with the thermogasodynamic analysis of the segmented annular seal provided with Rayleigh pockets. The paper is a continuation of the work presented Arghir, M., and Mariot, A. (2017, “Theoretical Analysis of the Static Characteristics of the Carbon...

...Stefan Thielen; Balázs Magyar; Bernd Sauer Regarding the increasing demand in seal lifetime and energy efficiency, a detailed microscopic simulation is necessary—as an addition to experimental investigations—to better understand and improve radial shaft seals. For this purpose, typically...

...Jun Wang; Yongkang Li; Zisheng Lian The work presented in this paper describes a new approach to calculate the film profile, friction, and fluid transport of a reciprocating U-cup seal used in a hydraulic piston pump. An innovative partial lubrication model of the seal is developed, which connects...

...Xiuying Wang; Liping Shi; Wei Huang; Xiaolei Wang 06 07 2018 01 08 2018 Hydrodynamic lubrication Seals The authors regret the following errors: 1. Equation (19) should be 1 R ¯ ∂ ∂ R ¯ ( R ¯ P ¯ H ¯ 3 ∂ P ¯ ∂ R...

... Model of Liquid/Gas Mechanical Face Seals ,” STLE Tribol. Trans. , 40 ( 4 ), pp. 647 – 657 . 10.1080/10402009708983705 [3] Miller , B. , and Green , I. , 2001 , “ Numerical Formulation for the Dynamic Analysis of Spiral-Grooved Gas Face Seals ,” ASME J. Tribol. , 123 ( 2 ), pp. 395...

...Dara Childs New models are developed for flexibly mounted stator (FMS) and flexibly mounted rotor (FMR) mechanical seals that incorporate the radial reaction force components produced by supporting O-rings due to relative squeezing motion across the O-rings. Supporting data come from tests done...

...Serge Tsala; Yves Berthier; Guilhem Mollon; Aude Bertinotti In this technical brief, we present detailed finite element simulations of a sealing system operating in quasi-static conditions, in the framework of the real piston actuator of a landing gear braking system. Numerical results show two...