arXiv subjects

S. L. Arsenjev

Publications and source records attributed to S. L. Arsenjev.

13 recordsLinked to original sources

arXiv2008

To mechanics of deformation, flow, and fracture

It is stated in the main in essence new approach to mechanics of the stressed state of the solid body from statistically isotropic material and the homogeneous liquid dynamics. The approach essence is in the detected property of the core-shell spontaneous structurization of internal energy of the solid and liquid bodies in its natural state and under action of external forces. The method elements of construction of physically adequate model of the stressed state of the solid and liquid bodies, reproduced exactly its behavior on the stages of elastic and plastic deformation, flow and fracture, are stated. It is adduced a number of the examples of the stressed state construction of the simple form bodies under action of its tension, compression, torsion and at its contact interaction. For the first time it is adduced structure of the principal - normal - stresses in cylindrical bar under action of the torsion moment. The detected property and the developed method is one of necessary bases for construction of physically adequate mathematical model of the stressed state of the body and fluid in contrast to traditional approach.

physics.flu-dyn↗

arXiv2008

The fluid motion physics: The interaction mechanics of a free liquid jet with a body and with the other free liquid jet

Solution of a problem on the interaction mechanics of a free liquid jet with a flat plate, body and with other jet has been achieved by means of a graphic-analytical method, developed by author of the given article. This method has allowed physically adequately and visually to describe the flow field near the streamlined surface and to give expressions for quantitative evaluation of the jet pressure profile onto this surface. This method is equally correct for both a flat jet and a jet with a round cross-section. Analysis of the flow field has allowed to detect a jet component, induced by the body fore part in the unrestricted fluid stream and determining the body form drag. Besides that, it has been ascertained that a friction also induces the jet component in the potential boundary layer. It has been introduced a new notion of the stream total head vector, determining an origin of the possible jet flow in the stream.

physics.flu-dyn↗

arXiv2007

Fluid Motion Physics: The Total Head Vector of the Real Fluid Stream

The overcoming of a mechanics problem on origin of secondary jet flows, on dynamics of its development and interaction with the main stream of the viscous fluid is reached by means of elucidation of the energy distribution in the stream at its interaction with the flow system walls and a body surface. In contrast to a traditional conception on a total head of a fluid stream in a pipe as a sum of a velocity head and a static pressure, it is ascertained that this sum is only longitudinal component of the stream total head vector. It is stated a new conception and it is produced the expressions for quantitative evaluation of radial and tangential components of the stream total head vector and for angle of its deflection from the stream axis. The new approach has allowed rationally to explain the causes of origin of the secondary jet flows and dynamics of its interaction with the main stream in various cases. Thereby with the taking into account of previous articles of the author the necessary theoretical preconditions has been created for a working out of the modern physically valuable apparatus for mathematical modeling of the real - viscous - fluid motion in any problems of hydromechanics and gas dynamics.

physics.flu-dyn↗

arXiv2006

To the Strength First Problem Full Solution: Mechanics of a Necking

Essentially new approach to analysis of internal forces, arising in cylindrical rod under action of an axial tension force, has allowed to detect the three-dimensional axisymmetric stress state. According to the new conceptual model the axial tension force causes the tangential - hoop and radial - stresses side by side with axial (normal) stress in the rod volume. A completion of Lame's solution of the problem on the stress state in the thickwalled cylinder has allowed to ascertain a mutual direct and reverse connection of the tangential and radial stresses with the axial stress also in the rod under action of an axial tension force. The new approach for the first time has allowed to give the full physically adequate and mathematically sufficiently strict description of a change of the initial cylindrical form of a mild steel rod under action of an axial tension force on all stages of its deforming, including the necking, the fracture process and a view of the fracture surface. The new approach has allowed on the united methodological base to elucidate also a number of the questions, bound with an axisymmetric form of the soap solution film between two rings, with the breaking up of a liquid free jet nto drops, with the causes of a buckling of the long tube under action of internal pressure, created in it by the rested and moved fluid in it and others.

physics.flu-dyn↗

arXiv2006

To the Fluid Motion Dynamics

A fluid motion through the flow element is presented in the kind of an autooscillating system with the distributed parameters: mass, elasticity, viscosity. The system contains a self-excited oscillator and possesses a self-regulation on base of the intrinsic voluntary negative servo output feedback. The interaction dynamics of the submerged jet, out-flowing out of a flow element, with the homogeneous for it surrounding medium as well as dynamics of evolution of the spiral-vortex structures, appearing at the relative motion of fluids, are described for the first time. The conceptual model of a flow in the kind of the completed system of the cause and effect relationship, that presents the fluid motion process as a result in interaction of the motive power, applied from without, and the internal wave mechanism, selfregulating the flow structure and its intensity, is created.

physics.flu-dyn↗

arXiv2005

Laval Turbonozzle Dynamics

The results of computing experiments are presented for the steam and gas stream motion in converging-diverging flow element called Laval nozzle and applied in steam and gas turbines. In beginning the experiments had carried out for Laval nozzle tested by Stodola and then for this turbonozzle various modifications. Quantitative evaluation of the state and motion parameters of the viscous compressible fluid and the metering characteristics of the flow elements are given as well as physically adequate interpretation of the obtained results is presented at the first time. The computing experiments are carried out by means of VeriGas program-modeler composed on the base of a new approach to the classical physics development in field of fluid motion.

physics.flu-dyn↗

arXiv2003

The Gasdynamics First Problem Solution. The Gas Stream Parameters, Structures, Metering Characteristics for Pipe, Nozzle

The development of the classical physics fundamentals with usage of experience of the experimental and computational-analytical investigations has allowed to create the valid conception of a fluid motion. The multidisciplinary approach on a new basis has allowed to ensure the physical adequacy to a mathematical model of the gas flow with allowance for essential nonlinearity of change of the gas stream main parameters and the metering characteristics of the flow elements of the type: pipe, pipeline, convergent nozzle and also with allowance for the evolutional character of the gas flow structure before a setting, in the itself flow element and in jet flowing out from one. The example of the valid solution of the direct and inverse problems about a gas flow through the flow element is given for the first time. The results of the solution by amount, kind and precision of the obtained information are an example of the satisfactory solution of the gas dynamics problem.

physics.flu-dyn↗

arXiv2003

The boundary and continual transfer phenomena in fluids and flows

The clearing up of a wave nature of the energy and mass transfer phenomena in classical expressions of the molecular-kinetic theory has allowed to find a quantitative measure of intensity of processes of a thermal conductivity, viscosity and diffusion in conditions of a thermally nonequilibrium and heterogeneous composition continuum. It is rotined that the appearance of a temperature drop in fluid stipulates the appearance of the continuum stratification and formation of the flowing bodies interacting among themselves. It is rotined that the known expressions for a thermal conductivity, viscosity, diffusion and heat convection had been obtained for a thermally equilibrium and homogeneous continuum and produce a maximum quantity of intensity of the transfer processes. The introduced expression is usable for a quantitative estimation of intensity of the transfer processes in fluid and its streams in conditions of the non-stationary heat exchange in natural conditions and technical problems.

physics.flu-dyn↗

arXiv2003

The laminar flow instability criterion and turbulence in pipe

The identification of stream in the straight pipe as a flexible rod has allowed to present the criterion expression for determination of transition of the laminar flow regime to the turbulent as a loss of stability of the rectilinear static structure of translational motion of stream in pipe and its transition to the flexural-vortical dynamic structure of translational motion, just as a flexible rod buckling. The introduced criterion allows to take into account an influencing of the inlet geometry, the pipe length, the flow velocity, and also of any physical factors on stability of the rectilinear flow structure. It is ascertained, that Reynolds number is the number of local hydrodynamic similarity and it is displayed that one is constituent part of the introduced stability criterion. The developed approach to a problem of stability is applicable for a problem solving on internal flow and external streamline.

physics.flu-dyn↗

arXiv2003

The gas equation for stream

The equation of state for gas stream as analog of well-known equation of state of gas medium in the static conditions is submitted. The connection of parameters of state and motion, and also the volume-flow rate and the mass-flow rate of the gas stream during change of its temperature and pressure as the result of external action is shown on example of modification of the represented equation.

physics.flu-dyn↗

arXiv2003

The Flowing System Gasdynamics. Part 3: Saint-Venant - Wantzel formula modern form

The modern form of the Saint-Venant - Wantzel formula for an outflow velocity of gas stream from flowing element is submitted. Taking into account of contact interaction of gas stream with the streamline surface in the form of the static head law has allowed to find the spatial-energy liaison in flowing system. The physically correct combination of mechanics of contact interaction and thermodynamics of fluid medium in one formula has allowed simultaneously to be liberated from the velocity coefficient and the discharge coefficient and polytropic process. In the new form the formula has gained the key character for computation of parameters of motion and state of gas stream in the flowing system.

physics.flu-dyn↗

arXiv2003

The Flowing System Gasdynamics Part 2: Euler momentum conservation equation solution

The solution of a momentum conservation equation for the gas and liquid stream in the flowing element is obtained on the basis of the modern approach to a problem on contact interaction of bodies and mediums. A flowing element, system are: pipe, tube, orifice, mouthpiece, diffuser, etc. and its combination. The integration of the differential equation has reduced to distribution law of static head along the length of flowing element and has proved the elementary algebraic solution that introduced in the previous paper by these authors. The received solution allows to describe the motion of fluid medium in non-stationary conditions, under action of any time-varying physical factors: a roughness of streamlined surface, the area of the section of the flowing element, the heat exchange with the streamlined surface, the technical work, the additional weight flow of fluid medium.

physics.flu-dyn↗

arXiv2003

The Flowing System Gasdynamics Part 1: On static head in the pipe flowing element

The solution of problem on distribution of static head along the pipe flowing element is submitted. The solution is reached on the basis of consideration of contact interaction of gas and liquid stream with the wall of the pipe flowing element. The expression for distribution of static head along the pipe flowing element is obtained on the basis of usage of three fundamental laws in fluid dynamics: Torricelli formula, Weissbach-Darcy formula and Bernoulli equation. The general solution is obtained for a gas stream. The special case of the obtained solution is retrieved for liquid stream.

physics.flu-dyn↗