Study of fluid layer gravity motion over vertical surface

This paper presents the results of studying the motion of a liquid layer along the walls of a vertically installed pipe under the action of gravity. Two-dimensional boundary layer is formed by the fluid motion relative to the hard wall on surfaces of structures (pipes, turbines, heat-and-mass transf...

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Autores principales:	Arestak Sarukhanyan, Norik Sarkisyan, Vache Tokmajyan, Arevshad Vartanyan
Formato:	article
Lenguaje:	EN
Publicado:	Scientific Route OÜ 2021
Materias:	fluid boundary layer viscosity velocity profile mean velocity shearing stresses Mechanical engineering and machinery TJ1-1570 Physics QC1-999
Acceso en línea:	https://doaj.org/article/9be4c85921a34d60a160c4742a7fc47e
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id	oai:doaj.org-article:9be4c85921a34d60a160c4742a7fc47e
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spelling	oai:doaj.org-article:9be4c85921a34d60a160c4742a7fc47e2021-11-19T13:32:07ZStudy of fluid layer gravity motion over vertical surface2461-42542461-426210.21303/2461-4262.2021.002115https://doaj.org/article/9be4c85921a34d60a160c4742a7fc47e2021-11-01T00:00:00Zhttp://journal.eu-jr.eu/engineering/article/view/2115https://doaj.org/toc/2461-4254https://doaj.org/toc/2461-4262This paper presents the results of studying the motion of a liquid layer along the walls of a vertically installed pipe under the action of gravity. Two-dimensional boundary layer is formed by the fluid motion relative to the hard wall on surfaces of structures (pipes, turbines, heat-and-mass transfer equipment, aircrafts, ships, etc.), which are of positive interest in engineering practice. Further upgrading of the above-mentioned structures is possible only by increasing accuracy of momentum in the boundary layer, heat and mass transfer rates calculation. It is confirmed that in the boundary layer transfer phenomena intensity (perpendicular to the wall) is due to the fluid particles velocity distribution regularities in the cross-section of the layer. Fluid velocity distribution regularities in turn are conditioned by Reynolds number according to current notions. The principal method of quantitative analysis of turbulent flow in a boundary layer suggested by Reynolds continues to be the velocity and pressure fluctuations averaging method for some timespan. The suggested model of fluid movement enables to prognosticate conditions under which in cross-sections of the boundary layer reshaping of velocity profile takes place, to carry out analytic calculation of such hydrodynamic characteristics as mean velocity of motion, layer thickness and shearing stresses acting on the wall. The difference between the suggested methods developed for calculation of flow parameters from the well-known ones is in that that calculations are made based on an integrated approach regardless of such conceptual definitions as laminar and turbulent regimes widely used in modern hydrodynamics. Obtained results and design formulas known in the literature have been compared. It has been found that the thickness of the sliding layer, determine by the proposed calculation formula, 1.17 times smaller than that determined by the currently used formulaArestak SarukhanyanNorik SarkisyanVache TokmajyanArevshad VartanyanScientific Route OÜarticlefluidboundary layerviscosityvelocity profilemean velocityshearing stressesMechanical engineering and machineryTJ1-1570PhysicsQC1-999ENEUREKA: Physics and Engineering, Iss 6, Pp 28-38 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fluid boundary layer viscosity velocity profile mean velocity shearing stresses Mechanical engineering and machinery TJ1-1570 Physics QC1-999
spellingShingle	fluid boundary layer viscosity velocity profile mean velocity shearing stresses Mechanical engineering and machinery TJ1-1570 Physics QC1-999 Arestak Sarukhanyan Norik Sarkisyan Vache Tokmajyan Arevshad Vartanyan Study of fluid layer gravity motion over vertical surface
description	This paper presents the results of studying the motion of a liquid layer along the walls of a vertically installed pipe under the action of gravity. Two-dimensional boundary layer is formed by the fluid motion relative to the hard wall on surfaces of structures (pipes, turbines, heat-and-mass transfer equipment, aircrafts, ships, etc.), which are of positive interest in engineering practice. Further upgrading of the above-mentioned structures is possible only by increasing accuracy of momentum in the boundary layer, heat and mass transfer rates calculation. It is confirmed that in the boundary layer transfer phenomena intensity (perpendicular to the wall) is due to the fluid particles velocity distribution regularities in the cross-section of the layer. Fluid velocity distribution regularities in turn are conditioned by Reynolds number according to current notions. The principal method of quantitative analysis of turbulent flow in a boundary layer suggested by Reynolds continues to be the velocity and pressure fluctuations averaging method for some timespan. The suggested model of fluid movement enables to prognosticate conditions under which in cross-sections of the boundary layer reshaping of velocity profile takes place, to carry out analytic calculation of such hydrodynamic characteristics as mean velocity of motion, layer thickness and shearing stresses acting on the wall. The difference between the suggested methods developed for calculation of flow parameters from the well-known ones is in that that calculations are made based on an integrated approach regardless of such conceptual definitions as laminar and turbulent regimes widely used in modern hydrodynamics. Obtained results and design formulas known in the literature have been compared. It has been found that the thickness of the sliding layer, determine by the proposed calculation formula, 1.17 times smaller than that determined by the currently used formula
format	article
author	Arestak Sarukhanyan Norik Sarkisyan Vache Tokmajyan Arevshad Vartanyan
author_facet	Arestak Sarukhanyan Norik Sarkisyan Vache Tokmajyan Arevshad Vartanyan
author_sort	Arestak Sarukhanyan
title	Study of fluid layer gravity motion over vertical surface
title_short	Study of fluid layer gravity motion over vertical surface
title_full	Study of fluid layer gravity motion over vertical surface
title_fullStr	Study of fluid layer gravity motion over vertical surface
title_full_unstemmed	Study of fluid layer gravity motion over vertical surface
title_sort	study of fluid layer gravity motion over vertical surface
publisher	Scientific Route OÜ
publishDate	2021
url	https://doaj.org/article/9be4c85921a34d60a160c4742a7fc47e
work_keys_str_mv	AT arestaksarukhanyan studyoffluidlayergravitymotionoververticalsurface AT noriksarkisyan studyoffluidlayergravitymotionoververticalsurface AT vachetokmajyan studyoffluidlayergravitymotionoververticalsurface AT arevshadvartanyan studyoffluidlayergravitymotionoververticalsurface
_version_	1718420086523428864

Study of fluid layer gravity motion over vertical surface

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