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Modeling Slug Flow and Mass Transfer in Inclined Pipes

THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING 2016年第3期50卷 237-241页

作者： Pokusaev, B. G. Nekrasov, D. A. Khramtsov, D. P. Moscow State Univ Mech Engn Moscow 107023 Russia

An experimental and numerical study of the gas projectile mass transfer when moving in an inclined pipe has been carried out. The mathematical model is based on the smoothed particle hydrodynamics method and verified by experimental data. The dependence of the velocity of the gas projectile motion and effective dimensionless mass transfer coefficient on the pipe inclination angle has been found. The simulated and calculated from experimental data bubble profiles have been compared.

关键词： granular layer multiphase flow gas projectile mass transfer computational hydrodynamics

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MATHEMATICAL MODELING OF THE HEAT TRANSFER AND CONDITIONS OF IGNITION OF A TURBULENT FLOW OF A REACTIVE GAS

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2016年第1期89卷 212-220页

作者： Matvienko, O. V. Tomsk State Univ 36 Lenin Ave Tomsk 634036 Russia Tomsk State Univ Architecture & Civil Engn 2 Solyanaya Sq Tomsk 634003 Russia

Results of investigations into the heat transfer and conditions of ignition of a turbulent flow of a chemically reactive gas have been presented. Approximation formulas have been obtained for determining the critical conditions of ignition of the turbulent flow, the length of the preflame zone, and the criterion of heat transfer in subcritical and supercritical reaction regimes.

关键词： turbulent flows heat transfer chemical reaction ignition computational hydrodynamics

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MATHEMATICAL MODELING OF THE HEAT TRANSFER AND CHEMICAL REACTION OF A SWIRLING FLOW OF A DISSOCIATIVE GAS

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2016年第1期89卷 127-134页

作者： Matvienko, O. V. Bubenchikov, A. M. Tomsk State Univ 36 Lenin Ave Tomsk 634036 Russia Tomsk State Univ Architecture & Civil Engn 2 Solyanaya Sq Tomsk 634003 Russia

The authors give the results of investigations into the heat transfer of a swirling flow reacting to absorb the heat of the gas in a cylindrical channel. The performed analysis shows that the heat transfer grows with the flow swirl near the tube inlet and decreases downstream. To intensify the heat transfer it is necessary to organize the flow so that the region with the dominance of centrifugal forces occupies a major portion of the channel.

关键词： swirling flows heat transfer chemical reaction computational hydrodynamics

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Viscosity and nonlinearity effects on the forces and waves generated by a floating twin hull under heave oscillation

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APPLIED OCEAN RESEARCH 2015年 51卷 138-152页

作者： Ananthakrishnan, Palaniswamy Florida Atlantic Univ Dept Ocean & Mech Engn Boca Raton FL 33431 USA

Nonlinear hydrodynamics of a twin rectangular hull under heave oscillation is analyzed using numerical methods. Two-dimensional nonlinear time-domain solutions to both inviscid and viscous problems are obtained and the results are compared with linear, inviscid frequency-domain results obtained in [26] to quantify nonlinear and viscous effects. Finite-difference methods based on boundary-fitted coordinates are used for solving the governing equations in the time domain [2]. A primitive-variables based projection method [6] is used for the viscous analysis and a mixed Eulerian-Lagrangian formulation [11] for inviscid analysis. The algorithms are validated and the order of accuracy determined by comparing the results obtained from the present algorithm with the experimental results of Vugt [22] for a heaving rectangle in the free surface. The present study on the twin-hull hydrodynamics shows that at large and non-resonant regular frequencies, and small amplitude of body oscillation, the fluid viscosity does not significantly affect the wave motion and the radiation forces. At low frequencies however the viscosity effect is found to be significant even for small amplitude of body oscillation. In particular, the hydrodynamic force obtained from the nonlinear viscous analysis is found to be closer to the linear inviscid force than the nonlinear inviscid force to the linear inviscid force, the reason for which is attributed to the wave dampening effect of viscosity. Since the wave lengths generated at smaller frequencies of oscillation are longer and therefore the waves could have a more significant effect on the dynamic pressure on the bottom of the hulls which contribute to the heave force, the correlation between the heave force and the wave elevation is found to be larger at smaller frequencies. Because of nonlinearity, the wave radiation and wave damping force remained nonzero even at and around the resonant frequencies - with the resonant frequencies as determined

关键词： Wave-body interaction Multi-hull hydrodynamics Helmholtz resonance Sloshing waves Wave radiation computational hydrodynamics

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MODELING OF COOLANT FLOW IN THE FUEL ASSEMBLY OF THE REACTOR OF A FLOATING NUCLEAR POWER PLANT USING THE LOGOS CFD PROGRAM

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2015年第5期88卷 1297-1303页

作者： Dmitriev, S. M. Dobrov, A. A. Legchanov, M. A. Khrobostov, A. E. RE Alekseev Nizhniy Novgorod State Tech Univ 24 Minin Str Nizhnii Novgorod 603950 Russia

Results of computer modeling of coolant flow in the fuel assembly of the reactor of a floating nuclear power plant using the LOGOS CFD programs have been given. The possibility of using the obtained results to improve models built into the engineering programs of thermohydraulic calculation of nuclear-reactor cores has been considered.

关键词： core reactor facility fuel assembly heat and mass transfer computational hydrodynamics

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SIMULATION OF NON-NEWTONIAN EMULSION FLOWS IN MICROCHANNELS

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2015年第6期88卷 1483-1490页

作者： Malanichev, I. V. Akhmadiev, F. G. Kazan Univ Architecture & Civil Engn 1 Zelenaya Str Kazan 420043 Russia

Simulation of emulsion flows in differently shaped microchannels to reproduce the choking of such flows as a result of the effect of dynamic blocking has been made. A model of a highly concentrated emulsion as a structure of tightly packed deformed droplets surrounded by elastic shells is considered. The motion of liquid was determined by the method of the lattice Boltzmann equations together with the immersed boundary method. The influence of the non-Newtonian properties and of elastic turbulence of the indicated emulsion, as well as of the elasticity of the shells of its droplets and of the interaction of these shells on the emulsion motion in a microchannel, has been investigated. It is shown that the flow of this emulsion can be slowed down substantially only due to the mutual attraction of the shells of its droplets.

关键词： emulsion effect of dynamic blocking computational hydrodynamics method of the lattice Boltzmann equations method of immersed boundary

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NUMERICAL INVESTIGATION OF FLOW IN A CENTRIFUGAL COMPRESSOR

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2015年第5期88卷 1274-1279页

作者： Grishin, Yu A. Bakulin, V. N. NE Bauman Moscow State Tech Univ 5 2nd Baumanskaya Str Moscow 105007 Russia Russian Acad Sci Inst Appl Mech Moscow 125040 Russia

With the use of the domestic software suite of computational hydrodynamics FlowVision based on application of the method of control volumes, numerical simulation of air composition and delivery by a centrifugal compressor employed for supercharging a piston engine has been carried out. The head-flow characteristics of the compressor, as well as the 3D fields of flow velocity and pressure distributions in the elements of the compressor flow passage, including the interblade channels of the impeller, have been obtained for various regimes. In the regimes of diminished air flow rate, surging phenomena are identifi ed, characterized by a return flow. The application of the technique of numerical experiment will make it possible from here on to carry out design optimization of the compressor flow passage profi le and thus to improve its basic characteristics - the degree of pressure increase, compressed air flow rate, and the effi ciency - as well as to reduce the costs of the development and production of compressors.

关键词： computational hydrodynamics method of control volumes FlowVision suite centrifugal compressor head-flow branches velocity and pressure fields

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MATHEMATICAL MODELING OF CATALYTIC OXIDATION OF METHANE IN A CHANNEL WITH A POROUS INSERT

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2014年第6期87卷 1298-1312页

作者： Matvienko, O. V. Baigulova, A. I. Bubenchikov, A. M. Tomsk State Univ Architecture & Civil Engn 2 Solyanaya Ave Tomsk 634003 Russia Tomsk State Univ Tomsk 634036 Russia

Results of investigations of the structure and chemical reaction of a swirling flow in a cylindrical channel with a porous end insert have been presented. The performed analysis shows that for the characteristics of chemical transformation in a catalytic reactor to be improved, it is necessary to organize flow so as to decrease its mean-flowrate velocity in the reactor at a prescribed rate of flow and to ensure as uniform as possible radial distribution of the axial velocity.

关键词： catalytic oxidation physicochemical hydrodynamics methane-air mixture swirling flows computational hydrodynamics

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MATHEMATICAL SIMULATION OF A SWIRLING VISCOPLASTIC FLUID FLOW IN A CYLINDRICAL CHANNEL

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2014年第5期87卷 1177-1185页

作者： Matvienko, O. V. Bazuev, V. P. Dul'zon, N. K. Tomsk State Univ 36 Lenin Ave Tomsk 634050 Russia Tomsk State Architecture & Civil Engn Univ Tomsk 634003 Russia

The paper describes the results of investigations of a swirling viscoplastic fluid flow in a cylindrical channel. It has been established that on increase in the limit shear stress and plastic viscosity, the effect of swirling on the flow structure becomes less expressed: the depth of the axial velocity dip decreases to its complete disappearance, with the hydrodynamic flow stabilization being observed over a smaller distance from the channel inlet. It is shown that at the same Rossby number the recirculation intensity increase with decreasing limit shear stress and plastic viscosity.

关键词： rheology viscoplastic fluid swirling flows computational hydrodynamics

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INFLUENCE OF THE REGIME OF FLOW OF PARTICLES FROM A HYDROCYCLONE ON ITS SEPARATION CHARACTERISTICS

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JOURNAL OF ENGINEERING PHYSICS AND THERMOPHYSICS 2014年第1期87卷 24-37页

作者： Matvienko, O. V. Andropova, A. O. Agafontseva, M. V. Tomsk State Architecture & Civil Engn Univ 2 Solyanaya Sq Tomsk 634003 Russia

The influence of the presence of an air column in a hydrocyclone and the regime of flow of particles through its discharge orifices on the separation characteristics of the hydrocyclone was investigated. It was established that the flow of heavy particles through the lower discharge orifice of the hydrocyclone in the case where its upper discharge orifice is isolated from the atmosphere is larger than that in the case of free flow of particles to the atmosphere though both two orifices of the hydrocyclone. In the case where the lower discharge orifice of the hydrocyclone is isolated from the atmosphere, the involvement of light particles from the lower receiving bin into the reverse fluid flow in the axial zone of the hydrocyclone increases the resulting yield of particles through the upper discharge orifice of the hydrocyclone.

关键词： hydrocyclone separation air column free surface computational hydrodynamics

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