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1

Peculiarities of the operation of the oil pipeline in the process of its cleaning from paraffin deposition

Serediuk M. D.

Journal of Achievements in Materials and Manufacturing Engineering

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2021

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Vol. 106, nr 2

77--85

EN

Purpose: Improving the technology of cleaning the inner surface of the main oil pipelines from paraffin deposition by specifying the hydrodynamic parameters of the movement of the cleaning device in the cavity of the pipeline, by more accurate prediction of the time of its approach to the final point of purification. Design/methodology/approach: Performing theoretical researches and application of mathematical modelling methods in order to establish the regularities of the cleaning device movement in the oil pipeline. Findings: Regularities of changes in the capacity of the pipeline, the speed of the cleaning process, the specific energy consumption for oil transportation as a function of the linear coordinates of the place and time of the cleaning device movement in the pipeline were established. Research limitations/implications: The next stage of research is to establish the influence of the characteristics of the viscoplastic fluid of the paraffin plug on the additional resistance and the mode of the cleaning device movement in the pipeline. Practical implications: It was developed the method that allows predicting the capacity and energy efficiency of the pipeline operation for each point in time of the process of cleaning from paraffin deposition. Originality/value: The originality of the method is the taking into account the additional hydraulic resistance of the paraffin plug and the available energy resources of oil pumping stations on the hydrodynamic process of moving the cleaning device in the oil pipeline.

2

Closed form solutions of heat and mass transfer in the flow of a MHD visco-elastic fluid over a porous stretching sheet

Ashokkunar K., Veena P. H., Pravin V. K.

International Journal of Applied Mechanics and Engineering

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2013

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Vol. 18, no. 4

989--1002

EN

The problem of heat and mass transfer in a visco-elastic fluid flow over a stretching sheet in the presence of a uniform magnetic field is examined. The important physical quantities such as the skin friction coefficient, heat transfer co-efficient and the mass transfer co-efficient are determined. It is found that the heat and mass transfer distribution decreases with the increasing values of the visco-elastic parameter k1.

3

Badania analityczne rozkładu ciśnienia w przepływie polimeru przy użyciu modelu Ostwalda-de Waele w kanałach stożkowych

Michalski D., Walicki E., Walicka A., Jurczak P.

Inżynieria i Aparatura Chemiczna

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2006

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Nr 6s

154-156

EN

Flow of molten polymer in conical channels is considered in the paper. To describe the problem a model of viscoplastic fluid is used and the results obtained are illustrated by Ostwald - de Waele fluid flow. The dimensionless formulae for pressure distributions in conical annular channels with inertia effects are presented.

4

Motion of a single solid and fluid sphere in viscoplastic fluids and viscoplastic fluid flow through fixed beds: a unified solution

Dolejs V., Siska B., Teichman R., Dolecek P., Brokl P.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, no 4

1157-1172

EN

An approach to the calculation of drag and fall or rise velocity of a solid and Newtonian fluid spheres in viscoplastic fluids and to the calculation of pressure drop in viscoplastic fluid flow through random fixed beds of particles is suggested. It is based on the application of the modified Rabinowitsch-Mooney equations together with corresponding relations for consistency variables and on the application of the relationship of Hadamard-Rybczynski valid for both the fluid and solid spheres. The solution is concretized for Bingham, Casson and Robertson-Stiff flow models, and in the case of fixed beds also for Herschel-Bulkley flow model.

5

Inertia effect on the pressure distribution in a thrust bearing lubricated by conducting and magnetic viscoelastic fluids

Walicka A.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, Spec. is

99-108

EN

A theoretical aspect of lubrication of a curvilinear thrust bearing by conducting and magnetic viscoelastic fluids is considered. The effects of centrifugal (rotational) inertia forces on the pressure distribution in the presence of a magnetic field, normal to the bearing surfaces, are examined. The examples of flows in the bearings modelled by two disks and two concentric spheres are discussed. The obtained results show that the fluid inertia forces and magnetic field have significant effects on the pressure distribution.