Effect of surface roughness on magneto‐hydrodynamic couple‐stress squeeze film lubrication between circular stepped plates

Naduvinamani, N. B.; Hanumagowda, B. N.; Siddangouda, A.

doi:10.1002/ls.170

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…In the literature, the experimental study of circular stepped disks is not available. However, a theoretical study on magneto-hydrodynamic couple-stress squeeze film characteristics between rough circular stepped disks has been carried out by Naduvinamani et al (2012). Neglecting the effects of magneto-hydrodynamic couple stresses and rough surfaces, their integrated Reynolds equation agrees with the present lubrication equation (3) with neglecting the term: 9v s 2 r/10h i 2 .…”

Section: Industrial Lubrication and Tribologymentioning

confidence: 64%

Effects of fluid inertia forces in ferrofluid lubricated circular stepped squeeze films – Shliomis model

Lin

Hung

2016

ILT

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Purpose This paper aims to study the inertia squeeze film characteristics between ferrofluid-lubricated circular stepped disks. Owing to the development of modern machine systems, the application of ferrofluids has received great attention. Because the circular disks are a special situation of circular stepped squeeze films, a further study of fluid inertia force effects on the ferrofluid-lubricated circular stepped squeezing mechanism is motivated. Design/methodology/approach On the basis of the ferrohydrodynamic flow model of Shliomis incorporating the momentum integral method, the effects of fluid inertia forces in ferrofluid-lubricated circular stepped squeeze films in the presence of external magnetic fields are investigated in this study. Analytical solutions of squeeze film performances are derived. Findings The fluid inertia force effects provide an increased load capacity and a longer squeeze film time for the ferrofluid-lubricated circular stepped squeeze film, especially for a larger value of the inertia parameter, the Langevin parameter and the volume concentration and a smaller value of the radius ratio and the step height ratio. Originality/value For engineering applications, numerical tables for squeeze film loads of circular stepped disks are also provided in this paper.

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Section: Industrial Lubrication and Tribologymentioning

confidence: 64%

Effects of fluid inertia forces in ferrofluid lubricated circular stepped squeeze films – Shliomis model

Lin

Hung

2016

ILT

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“…Figure 3 exhibits that the maximum dimensionless pressure peak (P max ) increases with increase in g. Under constant conditions of q = 0.1, L* = 0.2, Ce = 0.3, e = 0.1, l = 1.0 and b = 0.8, it is evident that P max for magnetized journal bearings obviously increase with increase in magnetic fluids supporting force (g) by about 5.5%, 16.7%, and 38.1% for g = 0.05, g = 0.1 and g = 0.2 in comparison with magnetized journal bearings without magnetic fluids supporting force (g = 0.0) respectively. This phenomenon is mainly due 2.8 3 10 24 m Ratio of width to diameter of bearing, l 1.0 Journal speed, n 2500 RPM Derivative of eccentricity ratio, _ e 0.1(q = 1.0,0.1,0.5), 0(q = 0.0) Derivative of attitude angle, _ u 130.8(q = 1.0), 130.7(q = 0.5), 129.9(q = 0.1) Magnetic fluids supporting force parameter, g 18,19 0.0, 0.05, 0.1, and 0.2 Couple-stress factor L* [20][21][22] 0.0, 0. to the magnetic fluids supporting force generated by the viscosity increase of magnetic fluids under the applied magnetic field, which increases P max . The larger the magnetic fluids supporting force parameter, the bigger maximum dimensionless pressure peak.…”

Section: Resultsmentioning

confidence: 99%

The lubrication characteristics of magnetized journal bearings affected by magnetic fluids considering the elasticity of its liner

Maiti

et al. 2022

Advances in Mechanical Engineering

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In order to investigate the lubrication characteristics of journal bearings with the elasticity of liner affected by magnetic fluids, a theoretic computation model was developed based on magnetic fluids supporting force parameter ([Formula: see text]) and couple-stress factor ([Formula: see text]). The results indicate that maximum dimensionless pressure peak ([Formula: see text]) of oil-film increases with increase in magnetic fluids supporting force parameter ([Formula: see text]), couple-stress factor ([Formula: see text]) and with decrease in elastic deformation coefficient ( Ce) of the liner. The loading capacity ([Formula: see text]) increases with increase in [Formula: see text], [Formula: see text] and with decrease in Ce particularly in the high eccentricity ratio ( ε); The attitude angle ([Formula: see text]) of S with different [Formula: see text] and [Formula: see text] decreases in a small range of ε at first, and then increases, it increases with the decrease of [Formula: see text] and [Formula: see text], and with the increase of [Formula: see text], theses phenomena are more obvious for [Formula: see text] at low ε and for [Formula: see text] and [Formula: see text] at moderate and high ε; the modified coefficient of friction ([Formula: see text]) decreases with increase in [Formula: see text], [Formula: see text] and with decrease in Ce; the side leakage ( Q) decreases with increase in [Formula: see text], with decrease in [Formula: see text] and with increase in Ce particularly in the low ( ε). Moreover, the increase of elastic deformation coefficient ( Ce) weaken the impacts of [Formula: see text], [Formula: see text] on the increase of [Formula: see text], [Formula: see text],[Formula: see text], and the decrease of [Formula: see text], Q.

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“…Equation (23) shows that the side leakage of magnetic fluids' journal bearing is determined as a resultant of two opposite effect. One is the pressure gradient ∂P=∂Z of magnetic fluids' oil film (at Z = 0.5), which is the main cause of increasing the side leakage, and the other cause is the sealing magnetic fluids' cohesion force F mz = m 0 X m H m (∂H m =∂Z) (at Z = 0.5) that reduces the side leakage.…”

Section: Parametersmentioning

confidence: 99%

Influence of magnetic fluids’ cohesion force and squeeze dynamic effect on the lubrication performance of journal bearing

2017

Advances in Mechanical Engineering

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Using the magnetic fluids containing polymer additives as the lubricant with couple stress, this article first develops the lubrication model of the journal bearing considering the couple interaction between its squeeze dynamic effect and its rotating effect. The effects of the squeeze dynamic effect of journal bearing, magnetic fluids' cohesion force, and magnetic fluids' couple stress on the lubrication performance of journal bearing (the load-carrying capacity (S) and its attitude angle (c), the friction coefficient (C f (R/c)), and the side leakage (Q)) has also been studied. The results above show that the maximum dimensionless film pressure (P max) along the bearing centerline increases as the increase of the squeeze dynamical effect parameter (q), magnetic fluids' cohesion force coefficient (g), and magnetic fluids' couple stress parameter (L*); c decreases as the increase of q, the decrease of g, and the increase of L*; S increases as the increase of q, g, and L*; C f (R/c) decreases as the increase of q, g, and L*; Q decreases as the decrease of q, the increase of g, and the increase of L*.

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Effect of surface roughness on magneto‐hydrodynamic couple‐stress squeeze film lubrication between circular stepped plates

Cited by 12 publications

References 22 publications

Effects of fluid inertia forces in ferrofluid lubricated circular stepped squeeze films – Shliomis model

Effects of fluid inertia forces in ferrofluid lubricated circular stepped squeeze films – Shliomis model

The lubrication characteristics of magnetized journal bearings affected by magnetic fluids considering the elasticity of its liner

Influence of magnetic fluids’ cohesion force and squeeze dynamic effect on the lubrication performance of journal bearing

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