Modern Approaches for Calculating Flow Parameters during a Laminar–Turbulent Transition in a Boundary Layer

Bykov, L. V.; Молчанов, А. М.; Yanyshev, D. S.; Platonov, I. M.

doi:10.1134/s0018151x18010042

Cited by 6 publications

(1 citation statement)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different models exist designed to explain laminar-turbulent modes, transformations of which information on the recent advances of that time is outlined in the monograph [14].…”

Section: Introductionmentioning

confidence: 99%

Study of fluid layer gravity motion over vertical surface

Sarukhanyan

Sarkisyan

Tokmajyan³

et al. 2021

Eureka: PE

View full text Add to dashboard Cite

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

show abstract

“…Different models exist designed to explain laminar-turbulent modes, transformations of which information on the recent advances of that time is outlined in the monograph [14].…”

Section: Introductionmentioning

confidence: 99%

Study of fluid layer gravity motion over vertical surface

Sarukhanyan

Sarkisyan

Tokmajyan³

et al. 2021

Eureka: PE

View full text Add to dashboard Cite

show abstract

Numerical Simulation of the Interaction of a Mach Wave and a Boundary Layer on a Flat Plate

Egorov,

Nguyen,

Pal’chekovskaya

2023

High Temp

View full text Add to dashboard Cite

Experimental research of turbulent flow frequency spectra

Краев

2020

INCAS BULLETIN

View full text Add to dashboard Cite

Hydraulic and heat transfer processes play a very important role in the design and prototyping of aerospace technology. In most cases this technique works under non-isothermal conditions. Non-isothermal conditions may significantly affect heat transfer and hydrodynamic process. Fundamental research of Non-isothermal turbulent flow is required for further engineering modeling. Models for unsteady processes calculation must be based on fundamental turbulent structure research. Moscow Aviation Institute National Research University (MAI) has been building non-isothermal turbulent flow structures since 1989. An experimental facility was designed to provide gas flow heating. Experimental data of a turbulent gas flow structure in isothermal and non-isothermal conditions are presented. The frequency spectra of axial and radial velocity pulsations are based on experimental data received. The results of experimental turbulent flow research demonstrate fundamental non-isothermal processes influence on the flow structure. The main results of non-isothermal experimental research show that there are three specific zones in turbulent flow structure: wall area, maximal turbulent structure transformation and flow core. The analysis of non-isothermal conditions influence on turbulent pulsations generation and development mechanisms is presented. The results show significant distinction in turbulent flow spectra between isothermal and non-isothermal conditions. The present paper describes a method of experimental research, methodology of data processing and non-isothermal turbulent flow spectra results.

show abstract

Modern Approaches for Calculating Flow Parameters during a Laminar–Turbulent Transition in a Boundary Layer

Cited by 6 publications

References 38 publications

Study of fluid layer gravity motion over vertical surface

Study of fluid layer gravity motion over vertical surface

Numerical Simulation of the Interaction of a Mach Wave and a Boundary Layer on a Flat Plate

Experimental research of turbulent flow frequency spectra

Contact Info

Product

Resources

About