Lead and zinc in the street dust of Zielona Gora, Poland

International Journal of Applied Mechanics and Engineering

2017

In this paper three simple flows of visco-plastic fluids of DeHaven type or fluids similar to them are considered. These flows are: Poiseuille flow in a plane channel, Poiseuille flow through a circular pipe and rotating Couette flow between two coaxial cylinders. After presentation DeHaven model it was presented some models of fluids similar to this model. Next it was given the solutions of equations of motion for three flows mentioned above.

Section: Discussionmentioning

confidence: 99%

Simple Flows of Pseudoplastic Fluids Based on Dehaven Model

International Journal of Applied Mechanics and Engineering

2017

“…Let the porous layer be homogeneous and isotropic and let the flow within the layer satisfy the modified Darcy's law. Thus one has [10,36] , …”

Section: Modified Reynolds Equation For a Bearing With A Porous Padmentioning

confidence: 99%

Influence of Wall Porosity and Surfaces Roughness on the Steady Performance of an Externally Pressurized Hydrostatic Conical Bearing Lubricated by a Rabinowitsch Fluid

International Journal of Applied Mechanics and Engineering

Walicki

Jurczak

et al. 2017

In the paper, the influence of both the bearing surfaces roughness as well as porosity of one bearing surface on the pressure distribution and load-carrying capacity of a curvilinear, externally pressurized, thrust bearing is discussed. The equations of motion of a pseudo-plastic Rabinowitsch fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and in a porous layer using the MorganCameron approximation and Christensen theory of hydrodynamic lubrication with rough bearing surfaces the modified Reynolds equation is obtained. The analytical solution is presented; as a result one obtains the formulae expressing the pressure distribution and load-carrying capacity. Thrust radial and conical bearings, externally pressurized, are considered as numerical examples.

“…An intrinsic curvilinear orthogonal coordinate system y x , ,  linked with the lower bearing surface is also presented in Fig.1. Taking into account the considerations of the works [11][12][13] we can present the equations of a Newtonian lubricant motion for axial symmetry as follows…”

Section: Analysis Of a Lubricant Flow In A Bearing Clearancementioning

confidence: 99%

“…Unfortunately, many researchers apply this assumption in the bearing applications. Many experimental and theoretical studies on the high-speed bearings show that the inertia effects of longitudinal and circumferential flows can be significant [8,9,11,12].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Total Inertia Effects in a Thrust Curvilinear Bearing Lubricated with Newtonian Lubricants

International Journal of Applied Mechanics and Engineering

Jurczak

2017

In the paper, the flow of a Newtonian type of lubricant in the clearance of a curvilinear bearing is considered. It is assumed that the bearing walls are modelled as smooth and impermeable. In analytical considerations, full inertia of the longitudinal flow and partial inertia of the circumferential flow are taken into account. The equation of motion of the lubricant is solved by the modified method of averaged inertia. A thrust bearing and spherical bearing are considered, for which dimensionless pressure distributions and the bearing capacity are given.