Final Report Summary - MAGFIS (Development of Advanced Magnetic Filtration System for Industrial Lubricants)
nThis research project is oriented on the decision of problems of effective functioning preserving of the industrial devices including innovative magnetic technologies on modelling of hydrodynamics and heat- and masstransfer, separations and filtrations in working liquids. They represent flows of the complex shear homogeneous and heterogeneous viscous media testing expressed influence of external inertial and mass forces (gravity, centrifugal, magnetic, nonstationary), in an internal area of devices with any wall surface boundary. Such devices and flows widespread in metalworking and chemical technologies, often meet in power system and power mechanical engineering, automotive industry, other sectors precision engineering.
Hydro-, gas - thermo- and mass transfer researches were made for developed prototype of magnetic devices within the limits of approaches of Computational Fluid Dynamics (CFD) for homogeneous and heterogeneous mixtures in internal systems at external force actions. The purpose of the modelling consisted: to understand an essence of transfer processes of heat, mass and momentum in working elements of developed devices which were sensitive to an operation of lubricants, and also a wide spectrum of water-based emulsions; and also to yield the forecast in optimum designing of elements and geometry of the industrial device, to define modes of its effective functioning in the conditions of changes of character influences of internal and external forces in working fluid. Some research problems have been executed:
1) Physical and mathematical, and numerical models of magnetic - and hydrodynamics, heat - and mass transfer in complex flows taking into account data on features of configuration, structure, industrial design/prototype of a magnetic element are developed. It can be valuable to processes of a filtration and separation in hydraulic fluids, lubricants, capture of all particles complicating operation of devices at a metal working, power system and machine industry.
2) The analysis of mechanisms at the momentum, heat and mass transfer processes in the low-Reynolds fields is carried out for explanation of stabilized and destabilized actions of external and internal forces in a mixture at the spatial and thermal strains caused by rotation, and non-isothermality, magnetic field operation, instabilities of forces of the vortex and thermal nature. These data can be used at detailed simulation of resistance and heat- and mass transfer by criteria relationships for integral parameters. They are valuable at development of design decisions for elements of the equipment in innovative magnetic techniques.
3) Data at simulation of spatial, nonstationary, developed and steady, viscous-inertial- and gravitational, laminar and turbulent, one- and two-phased liquid-liquid flows in internal systems with the fixed form of a cross-section with use of contactless methods of registration is obtained. It allows to supplement the mathematical models with the real data at the formulation of boundary tasks and numerical integration of the determining equations for velocities, concentrations and temperature of complex flow.
4) Conclusions have been given on generalization in the practice of applied calculations of information about problems of calculation of local properties of a complex shear flow with the expressed inhomogeneous anisotropic structure at action of external forces within the limits of RANS-method, in particular, with reference to problems of the power, automotive and mechanical engineering, chemical and petroleum process engineering.
The first part of research has been connected with explanation of some the problems, concerning possibilities and working out of methodology of detailed mathematical and numerical modelling of complex shear spatial flows, inert homogeneous and heterogeneous mixtures in interior areas of devices with filtration/separation at complicated flow boundary. The original version of statistical turbulent model of the second order "strains-fluxes" with the differential equations for a component of a full tensor of Reynolds stresses and components of specific turbulent fluxes of a scalar substance (heat and mass) has been formulated for the complex analysis of an actual state of the self-cleaned magneto-hydrodynamic and heat power equipment, high-precision optimization of modes of their functioning, and also the prevention of emergencies. The model is oriented on through calculation of the low-Reynolds flows with heat- and mass transfer directly from device wall into the flow core, including laminar sublayer and a buffer region. Key results are reduced to recommendations for choice dynamic and scalar bases for closures of the transport equations for shear stresses and scalar fluxes (heat and mass) with the account and without mass forces, and also to studying of behaviour of flow parameters at the near-wall fields of devices, mixture interactions, lubricants and magnetic cores.
The second part of research was reduced to studying of behavior of flow parameters, particles in the conditions of separation and attachment to the wall, the heat- and transfer intensification at action of variable on cross sections of a longitudinal pressure gradient because of spatial deformation caused by influence of the swirling, the thermal properties variability. Parametric visualization of the instantaneous quantities of velocity fields has allowed to estimate the sizes and intensity of recirculating flows in zoned area concerning configuration of magnetic cores. Such effects give the chance to formulate remarks to design decisions, prototype manufacturing, to spend efficient control of magnetic technologies in industrial applications.
The third stage of research consisted in studying of properties of the working media testing of instability of the vortex character owing to the laminarization. These effects generate the base physical data to the solution of the magnetic-, hydro- and gasdynamic problems, conjugated heat- and mass transfer. And also the new approach to multiple parameter calculation of the complex shear flows at the action of centrifugal, mass and magnetic forces, to the analysis of simularity and stability is developed. This data allows to improve schemas, design techniques on detailed modelling of transport processes in systems including filtration and separation effects, heating and refrigerating. And functioning regimes of the magnetic process equipment based on a principle of phased vortical and swirled flows can be corrected. The presented conclusions are reflected in results and recommendations about a choice and introduction of innovative magnetic- and hydrodynamic technologies, definition of the costs/ benefits/quality ration at prototype production in the industry.
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Hydro-, gas - thermo- and mass transfer researches were made for developed prototype of magnetic devices within the limits of approaches of Computational Fluid Dynamics (CFD) for homogeneous and heterogeneous mixtures in internal systems at external force actions. The purpose of the modelling consisted: to understand an essence of transfer processes of heat, mass and momentum in working elements of developed devices which were sensitive to an operation of lubricants, and also a wide spectrum of water-based emulsions; and also to yield the forecast in optimum designing of elements and geometry of the industrial device, to define modes of its effective functioning in the conditions of changes of character influences of internal and external forces in working fluid. Some research problems have been executed:
1) Physical and mathematical, and numerical models of magnetic - and hydrodynamics, heat - and mass transfer in complex flows taking into account data on features of configuration, structure, industrial design/prototype of a magnetic element are developed. It can be valuable to processes of a filtration and separation in hydraulic fluids, lubricants, capture of all particles complicating operation of devices at a metal working, power system and machine industry.
2) The analysis of mechanisms at the momentum, heat and mass transfer processes in the low-Reynolds fields is carried out for explanation of stabilized and destabilized actions of external and internal forces in a mixture at the spatial and thermal strains caused by rotation, and non-isothermality, magnetic field operation, instabilities of forces of the vortex and thermal nature. These data can be used at detailed simulation of resistance and heat- and mass transfer by criteria relationships for integral parameters. They are valuable at development of design decisions for elements of the equipment in innovative magnetic techniques.
3) Data at simulation of spatial, nonstationary, developed and steady, viscous-inertial- and gravitational, laminar and turbulent, one- and two-phased liquid-liquid flows in internal systems with the fixed form of a cross-section with use of contactless methods of registration is obtained. It allows to supplement the mathematical models with the real data at the formulation of boundary tasks and numerical integration of the determining equations for velocities, concentrations and temperature of complex flow.
4) Conclusions have been given on generalization in the practice of applied calculations of information about problems of calculation of local properties of a complex shear flow with the expressed inhomogeneous anisotropic structure at action of external forces within the limits of RANS-method, in particular, with reference to problems of the power, automotive and mechanical engineering, chemical and petroleum process engineering.
The first part of research has been connected with explanation of some the problems, concerning possibilities and working out of methodology of detailed mathematical and numerical modelling of complex shear spatial flows, inert homogeneous and heterogeneous mixtures in interior areas of devices with filtration/separation at complicated flow boundary. The original version of statistical turbulent model of the second order "strains-fluxes" with the differential equations for a component of a full tensor of Reynolds stresses and components of specific turbulent fluxes of a scalar substance (heat and mass) has been formulated for the complex analysis of an actual state of the self-cleaned magneto-hydrodynamic and heat power equipment, high-precision optimization of modes of their functioning, and also the prevention of emergencies. The model is oriented on through calculation of the low-Reynolds flows with heat- and mass transfer directly from device wall into the flow core, including laminar sublayer and a buffer region. Key results are reduced to recommendations for choice dynamic and scalar bases for closures of the transport equations for shear stresses and scalar fluxes (heat and mass) with the account and without mass forces, and also to studying of behaviour of flow parameters at the near-wall fields of devices, mixture interactions, lubricants and magnetic cores.
The second part of research was reduced to studying of behavior of flow parameters, particles in the conditions of separation and attachment to the wall, the heat- and transfer intensification at action of variable on cross sections of a longitudinal pressure gradient because of spatial deformation caused by influence of the swirling, the thermal properties variability. Parametric visualization of the instantaneous quantities of velocity fields has allowed to estimate the sizes and intensity of recirculating flows in zoned area concerning configuration of magnetic cores. Such effects give the chance to formulate remarks to design decisions, prototype manufacturing, to spend efficient control of magnetic technologies in industrial applications.
The third stage of research consisted in studying of properties of the working media testing of instability of the vortex character owing to the laminarization. These effects generate the base physical data to the solution of the magnetic-, hydro- and gasdynamic problems, conjugated heat- and mass transfer. And also the new approach to multiple parameter calculation of the complex shear flows at the action of centrifugal, mass and magnetic forces, to the analysis of simularity and stability is developed. This data allows to improve schemas, design techniques on detailed modelling of transport processes in systems including filtration and separation effects, heating and refrigerating. And functioning regimes of the magnetic process equipment based on a principle of phased vortical and swirled flows can be corrected. The presented conclusions are reflected in results and recommendations about a choice and introduction of innovative magnetic- and hydrodynamic technologies, definition of the costs/ benefits/quality ration at prototype production in the industry.
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