Experimental Investigations into the Performance of Porous Journal Bearings

Mokhtar, Mohamed; Rafaat, M.; Shawki, G. S. A.

doi:10.4271/840097

Cited by 19 publications

(27 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…results (1994). Figure 5 shows the comparison of the dimensionless load capacity versus the relative eccentricity between our results and experimental data of Mokhtar et al (1984). As it is illustrated in the figure, good agreement is observed between our numerical results and experimental data of Mokhtar et al (1984).…”

Section: Fig 4 Evolution Of Load Capacity Versus Eccentricity Resusupporting

confidence: 69%

“…These studies have shown that the increase in the permeability generates a decrease in the characteristics of the bearings: load capacity, pressure. Experimental results of Mokhtar et al (1984) have confirmed these results.…”

Section: Introductionsupporting

confidence: 68%

“…Based on the governing equations described previously, a computer program was developed to study the performance of the self-lubricating finite porous hydrodynamic journal bearing using non-Newtonian lubricants. In order to demonstrate the validity of the present analysis as well as the developed computational code, extensive comparisons with the results available in the literature have been conducted by Ju et al (1994) and Mokhtar et al (1984). Figure 4 illustrates the comparison between the numerical results obtained in this study and those of Ju et al (1994) for a non-porous journal bearing case.…”

Section: Resultsmentioning

confidence: 70%

See 2 more Smart Citations

Lubricant Rheological Behavior Effect Analysis on the Performance of Finite Porous Self- Lubricating Journal Bearings

Malki

Larbi

Boubendir

et al. 2018

JAFM

View full text Add to dashboard Cite

In this paper, the hydrodynamic lubrication of finite porous self-lubricating journal bearings is investigated taking into account the rheological lubricant behavior effect. The modified Reynolds equation is derived by considering both the fluid flow in the porous matrix and the lubricant rheological behavior where Darcy's law and power-law model were used. Governing differential equations were solved numerically using the finite difference method. Static characteristics are obtained by considering three types of lubricants: pseudo-plastic, dilatant and Newtonian fluids. Obtained results showed that the power law index, n, has important effects on the performance of porous and non-porous bearings. An improvement in the fluid bearing characteristics (load capacity, pressure) is observed for dilatant fluids (n>1) while these characteristics decreased for pseudoplastic fluids (n<1). The permeability of the porous structure has significant effects on the performance of porous journal bearings of finite length, particularly at higher eccentricity ratios. Good agreement is observed between the results obtained in this study and those of literature revue.

show abstract

Section: Fig 4 Evolution Of Load Capacity Versus Eccentricity Resusupporting

confidence: 69%

Section: Introductionsupporting

confidence: 68%

Section: Resultsmentioning

confidence: 70%

See 1 more Smart Citation

Lubricant Rheological Behavior Effect Analysis on the Performance of Finite Porous Self- Lubricating Journal Bearings

Malki

Larbi

Boubendir

et al. 2018

JAFM

View full text Add to dashboard Cite

show abstract

“…These parameters are used as input data for all the results to be presented in the following sections. Figurc 2 shows a comparison between the results of the present numerical solution and the experimental results reported by Mokhtar et al (13). It is assumed that the experimental results were measured for a perfectly aligned journal bearing (i.e.…”

Section: Comparison With Theoretical and Experimental Resultsmentioning

confidence: 82%

“…i s may be another reason for the difference between the three predictions. The geometry and operating parameters of the Mokhtar et al (13) bearing are given in Table 4. These parameters are used as input data for all the results to be presented in the following sections.…”

Section: Comparison With Theoretical and Experimental Resultsmentioning

confidence: 99%

Effects of Misalignment on the Performance of Flexible Porous Journal Bearings

Elsharkawy

2003

Tribology Transactions

View full text Add to dashboard Cite

A n~athematical model is introduced to study the effects of journal misalignment on the hydrodynamic lubrication performance offitlire flexible porous journal bearings. A modified form of Reynolds equation, which was derived from the Brinkman-extended Darcy equations and Stokes' equations, is utilized in the present study. The journal misalignment is allowed to vary in magnitude as well as in direction with respect to the bearing boundaries.The predicted pe~ormance characteristics of porous journal bearings are compared with available theoretical and experin1et1-tal results. The effects of the degree and angle of n~isalignmet~t, and the permeability of the porous liner on the pressure distribution, load-carrying capacity, friction coefficient and misalignment moment are presented and discussed. KEY WORDSJournal Bearings; Hydrodynamic Lubrication; Porous Bearings; Misalignment = radial clearance, m = flexibility parameter, Eq. [I31 . = degree of misalignment = eccentricity, m = modulus of elasticity of the bearing liner, Pa = friction coefficient = cavitation index, Eq. [7] = film thickness, m = dimensionless film thickness, H = h / c = permeability of bearing material, ni2 = dimensionless permeability, K = k / c2 = length of the bearing, m = misalignment moment, N.m 2 2 = dimensionless misalignment moment, mc2 /(poUR L ) = number of internal nodal points in 0 -direction = number of internal nodal points in z-direction = pressure of lubricant film, Pa = cavitation pressure, Pa = oil supply pressure, Pa =dimensionless pressure, P = pc2 I(poUR) = dimensionless cavitation pressure, P = pcc2 I(poUR) z dimensionless supply pressure, P = p c~2 /(poUR) = side leakage flow, m3 /s = dimensionless side leakage flow, Ql = qs /(URc) = radius of the journal, m = stress jump parameter = thickness of the bearing liner, m = velocity of the lubricant film in x-direction, m/s = dimensionless velocity of the lubricant film in x-direction, ii = u/U = surface velocity of the journal, U = oR, m/s = velocity of the lubricant film in z-direction = dimensionless velocity of the lubricant film in z-direction, 4 = w/U = total load capacity of the bearing, N = dimensionless total load capacity of the bearing, w = w ,~,~~ I ( P~U R~L ) = bearing coordinates in circumferential, radial, and axial directions, respectively = dimensionless coordinates in circumferential, radial, and axial directions, respectively, X = x / R, Y = y / c, Z = z / L = dimensionless parameter, a = (p* / p)In = bulk modulus of the lubricant, Pa = dimensionless bulk modulus,D = ,~' c~/ (~~U R ) = angle of misalignment = dimensionless thickness of the bearing liner, A = rl / c = eccentricity ratio, eo / c = under-relaxation factor = angular coordinate, rad = viscosity of the lubricant in the film region, P a s = effective viscosity of the lubricant in the porous matrix, Pa s = viscosity of the lubricant at atmospheric pressure, Pa s = dimensionless viscosity of the lubricant, = @//lo = Poisson's ratio of the porous liner material = lubricant density, kg m-3 = lubricant de...

show abstract

Analysis of a double layer porous hybrid journal bearing considering the combined influence of wear and non-Newtonian behaviour of lubricant

Singh

Sharma

2020

Meccanica

View full text Add to dashboard Cite

Experimental Investigations into the Performance of Porous Journal Bearings

Cited by 19 publications

References 3 publications

Lubricant Rheological Behavior Effect Analysis on the Performance of Finite Porous Self- Lubricating Journal Bearings

Lubricant Rheological Behavior Effect Analysis on the Performance of Finite Porous Self- Lubricating Journal Bearings

Effects of Misalignment on the Performance of Flexible Porous Journal Bearings

Analysis of a double layer porous hybrid journal bearing considering the combined influence of wear and non-Newtonian behaviour of lubricant

Contact Info

Product

Resources

About