By Shakhbaz A. Yershin
This publication, at the common subject of hydroaerodynamics, investigates a couple of intriguing functions during this box, addressing in particular concerns that let possible paradoxical concerns to be handled.
The first half is dedicated to the learn of channel flows, particularly the lateral circulation of a viscous and viscous-plastic liquid in a hoop channel shaped by way of coaxial cylinders. particularly, the matter of dissipation of mechanical power in channel flows of hugely viscous beverages is addressed and solved. in addition, the mechanism resulting in hydrodynamic erosion in intra-field pipelines (known as "channelized effect") is pointed out. therefore, a idea for channel flows with mass move via porous partitions is developed.
In the second one half, viscous liquid unfastened flows (jets) are investigated. particularly, a dispersion legislations for turbulent movement is derived and the lifestyles of dynamic invariance in wake flows of variable density is demonstrated.
The 3rd half offers new insights from either theoretical and experimental study into targeted vortex constitution formation and improvement. The stipulations for the lifestyles of Taylor-Goertler vortices are made up our minds and the mechanism for his or her formation is defined. final yet no longer least, the idea of vortex jewelry, a very fascinating challenge in hydroaerodynamics, is brought within the final component of this publication.
Care has been taken, whilst picking unique theoretical difficulties of curiosity, to make the hyperlink with similar subject matters within the released literature. whilst, all experimental examine defined during this publication is given a significant actual interpretation and corroborated via compatible theoretical versions and computations.
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This ebook, at the normal subject of hydroaerodynamics, investigates a few intriguing functions during this box, addressing in particular matters that let doubtless paradoxical matters to be handled. the 1st half is dedicated to the examine of channel flows, specifically the lateral circulation of a viscous and viscous-plastic liquid in a hoop channel shaped by means of coaxial cylinders.
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Additional info for Paradoxes in Aerohydrodynamics
5) can be written in a slightly simpler form as follows: ω¼ M2 r 22 1 1 À 2 À τ02 ln r: 2 r ð1:6:7Þ 24 1 Viscous and Viscoelastic Flow in Annular Channels Clearly, as in the previous case, the maximum stresses will occur at the surface of the fixed inner cylinder with smaller diameter, and if M ¼ 2πr 21 τ1 will exceed M0 ¼ 2πr 21 τ0 , the medium adjacent to r1 will flow. However, the shear stress τ will decrease with the growth of r, and at an unspecified distance r n > r 1 , the torque M value will equal to M0, and further in the field r n r r 2 , the flow will cease, and the medium will be rotating as an elastic body together with the outer cylinder at constant angular velocity ω2.
This section is named the stabilizing section (2). The known results of the study  were used as a reference for channel flow stabilization. The stabilization section had several drainage holes (9b) allowing measurement of the static pressure and velocity profiles crosswise the stabilization channel. 03 m thickness, with polished surfaces, and had two assembly joints, one with an inlet diffuser and the other with a work section. The latter was a natural extension of a wooden part of a channel, but the walls were made from a porous metal-ceramic sheet (4) with porosity coefficient εо ¼ 0:35 and average height of the roughness elements 2 Â 10À5 m.
Mat. 1 Preface As we know, viscosity is one of the most important dynamical characteristics of quantifiable fluids. Therefore, it is often defined as an unspecified characteristic constant at a given temperature and pressure, naming it the coefficient of dynamic viscosity μ. This coefficient is of great importance for describing many physical and physical-chemical processes. It has substantial significance for calculations in various fields of engineering. As a result, vast experimental data have accumulated on dependence of viscosity on temperature and pressure.
Paradoxes in Aerohydrodynamics by Shakhbaz A. Yershin