Use of the parallel-plate plastometer for the characterisation of viscous fluids with a yield stress

Covey, G. H.; Stanmore, B. R.

doi:10.1016/0377-0257(81)80024-9

Cited by 169 publications

(105 citation statements)

References 2 publications

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“…Steady state radial flows and time-dependent squeezing flows of yield-viscoplastic fluids are encountered in a variety of fields [1][2][3][4][5][6][7]. These flows are found in fabrication operations such as stamping, injection molding, and sheet forming.…”

Section: Introductionmentioning

confidence: 99%

“…These flows are found in fabrication operations such as stamping, injection molding, and sheet forming. Also, material properties of highly viscous fluids are measured with a device called the "plastometer" which incorporates a parallel-disk squeeze flow geometry [2,8,9]. In addition, such flows are encountered in lubrication systems, and there is a considerable interest as to the degree which viscoplastic additives enhance the load-bearing capacity of the lubricant.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Distribution in a Porous Squeeze Film Bearing Lubricated with a Herschel-Bulkley Fluid

Walicka¹,

Jurczak²

2016

International Journal of Applied Mechanics and Engineering

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The influence of a wall porosity on the pressure distribution in a curvilinear squeeze film bearing lubricated with a lubricant being a viscoplastic fluid of a Herschel-Bulkley type is considered. After general considerations on the flow of the viscoplastic fluid (lubricant) in a bearing clearance and in a porous layer the modified Reynolds equation for the curvilinear squeeze film bearing with a Herschel-Bulkley lubricant is given. The solution of this equation is obtained by a method of successive approximation. As a result one obtains a formula expressing the pressure distribution. The example of squeeze films in a step bearing (modeled by two parallel disks) is discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure Distribution in a Porous Squeeze Film Bearing Lubricated with a Herschel-Bulkley Fluid

Walicka¹,

Jurczak²

2016

International Journal of Applied Mechanics and Engineering

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“…Covey and Stanmore [4] obtained theoretical and experimental results for the flow of Bingham fluid in a par-allel-plate plasto-meter and discussed the presence and formations of yield surface. Papanastasiou [15] analyzed the steady, two-dimensional flow of Bingham fluid by considering modified constitutive equation.…”

Section: Introductionmentioning

confidence: 99%

“…J.S. Roy et.al [4] investigated the effects of inertia forces in an externally pressurized thrust bearing with converging and diverging fluid film using visco-elastic lubricant. Usha and Vimala [19] have discussed about inertia effects in circular squeeze films containing a central air bubble.…”

Section: Introductionmentioning

confidence: 99%

Inertia Effects in an Externally Pressurized Thrust Bearing Using Herschel - Bulkley Lubricants

Amalraj¹,

Narasimman²,

Kandasamy³

2012

AJCAM

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The combined effects of fluid inertia and viscous forces of a Herschel-Bulkley lubricant in an externally pressurized thrust bearing with circular geometry have been analyzed theoretically. Although the researchers of the past, laid out a foundation for the hydrodynamic lubrication, modern researchers intend to use non-Newtonian fluids characterized by a yield-value, such as Bingham, Casson and Herschel-Bulkley fluids as lubricants. More over, Tribologists emphasize a fact that in order to analyze the performance of the bearings adequately, it is necessary to consider the combined effects of fluid inertia and viscous forces of non-Newtonian lubricants. Therefore, in this research article, the combined effects of fluid inertia and viscous forces have been investigated theoretically in an externally pressurized thrust bearing with circular geometry using Herschel-Bulkley fluid as lubricant. The shape and extent of the core, along the radius, have been determined numerically for various values of the Herschel-Bulkley number and the power-law index. Using the appropriate boundary conditions, the velocity distributions in the flow and the core regions have been obtained. By considering the equilibrium of an element of the core in the fluid, the modified pressure gradient has been evaluated and thereby the film pressure and the load capacity of the bearing have been obtained numerically for different values of Reynolds number, Herschel-Bulkley number and power-law index. The effects of the inertia forces and the non-Newtonian characteristics of the lubricant, on the bearing performances have also been discussed.

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“…The effects of fluid inertia forces and non-Newtonian characteristics of lubricants in the squeeze film bearings have been examined by several investigators, (Tichy and Winer [8], Covey and Stanmore [2], Gartling and Phan-Thien [4], Donovan and Tanner [7], Huang et al [6], Usha and Vimala [9]) but there are few papers attempting to describe the combined effects of fluid inertia forces and non-Newtonian characteristics of lubricants (Elkough [3], Batra and Kandasamy [1]) . Even these works are without considering the sinusoidal motion of the squeeze film bearing.…”

Section: Introductionmentioning

confidence: 99%

Rheodynamic lubrication of a squeeze film bearing under sinusoidal squeeze motion

Kandasamy

Vishwanath

2007

Mat. apl. comput.

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Use of the parallel-plate plastometer for the characterisation of viscous fluids with a yield stress

Cited by 169 publications

References 2 publications

Pressure Distribution in a Porous Squeeze Film Bearing Lubricated with a Herschel-Bulkley Fluid

Pressure Distribution in a Porous Squeeze Film Bearing Lubricated with a Herschel-Bulkley Fluid

Inertia Effects in an Externally Pressurized Thrust Bearing Using Herschel - Bulkley Lubricants

Rheodynamic lubrication of a squeeze film bearing under sinusoidal squeeze motion

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