bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermal-hydraulic tests of finned recirculating cooling equipment
Authors: Lychakov V D , Egorov M Yu , Matyash A S , Shcheglov A A 
Published: December 2019

Abstract
The article analyzes the experience of thermal-hydraulic experimental studies of various types of finned tube heat exchangers by the Power Equipment Test Facility of JSC “NPO CKTI”. The method of testing the air-cooled heat exchanger with finned heat exchange surface for recirculation cooling units ROPE(A)-2400/253-1 of the Belarusian NPP was developed. The results of the tests according to the developed method are necessary to confirm the thermal characteristics of the heat exchange equipment of the NPP before the start of industrial operation.
Effect of porous inserts on aerodynamics of flying vehicles
Authors: Maslov A A , Mironov S G , Poplavskaya T V , Kirilovskiy S V , Tsyryulnikov I S 
Published: December 2019

AbstractExperimental and numerical investigations of a supersonic flow around a cylindrical model with a porous frontal insert made of a high-porosity cellular material performed at the Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences are briefly reviewed. New data on the influence of the angle of attack on the flow around a cylinder with a porous frontal insert are reported. Methods of using high-porosity cellular materials for controlling supersonic flows around axisymmetric bodies are demonstrated.
Heat transfer in supersonic separated flow of the compression corner
Authors: Zapryagaev V I , Kavun I N , Trubitsyna L P 
Published: December 2019

Abstract
This article presents the study results for heat transfer in supersonic laminar separated compression corner flow. The study was carried out for free-stream Mach number M = 6 and the compression ramp angle in the range of φ = 20° – 40°.
Turbulent spots in the flame of a diffusion torch
Authors: Lemanov V , Lukashov V , Sharov K , Nezavitin D 
Published: December 2019

Abstract
Jet flame in modes of manageable instability development inside the source of jet formation is one of the methods for controlling the space-time and thermodynamic parameters of the torch. When a system of vortices flows into a free atmosphere, their interaction with the mixing layer and the flame front is accompanied by the appearance of a number of effects. The introduction of artificial perturbations into the flow allowed initiating the onset of a laminarturbulent transition in the tube, which led to the formation of vortex structures in the jet stream. Hot-wire anemometric measurements of the velocity pulsations in the isothermal flow has shown that the disturbance introduced by the controlled valve is an acoustic precursor and a large-scale vortex formation. In this work, we investigated the effect of a system of turbulent spots on a laminar diffusion plume. Based on the two-point space-time temperature correlation dependences, data characterizing the rate of propagation of thermal perturbations during burning of H2/CO2 and C3H8/CO2 fuel mixtures were obtained.
Structure of a reacting flow of a turbulent swirling jet during combustion of a syngas–air mixture
Authors: Sharaborin D K , Tolstoguzov R V 
Published: December 2019

Abstract
The paper presents the results of an experimental study of the flow structure and features of combustion in a turbulent swirling lean pre-mixed syngas flame using modern planar optical laser-based methods. The measurement of the instantaneous velocity field was carried out using the particle image velocimetry (PIV), and location of the OH radicals in the jet were determined by the method of laser-induced fluorescence (PLIF). A comparison of the averaged flow characteristics of a high-swirl flame with an equivalence ratio Φ = 0.45 for syngas and Φ = 0.7 for methane are performed. Presence of a recirculation zone in the jet core is typical of both cases, however, the size of the central recirculation zone for the methane flame are approximately 1.5 times larger than that for the synthesis gas flame in both dimensions. The average distributions of the intensity of fluorescence signal of the OH radical shows a good coincidence of the position of the flame front in both cases, and lower fluorescence signal intensity for the synthesis gas flame.
Experimental and numerical study of the structure of premixed H2/CO/O2/Ar flames at atmospheric pressure
Authors: Knyazkov D A , Dmitriev A M , Bolshova T A , Shmakov A G , Korobeinichev O P , Markovich D M 
Published: December 2019

Abstract
Elaboration of a predictive and well validated kinetic mechanism for combustion of H2/CO mixtures is the key to development of advanced technologies for effective syngas burning in power generation systems. Moreover, understanding the combustion chemistry of H2/CO mixtures is a prerequisite for a comprehensive description of hydrocarbons chemistry and development of predictive chemical kinetic models for combustion of transportation fuels. In this work we report new experimental data for chemical speciation in the atmospheric pressure burner-stabilized premixed flames diluted with Ar and fuelled with H2/CO (1:1) mixture at equivalence ratios of 1 and 2. Flame sampling molecular beam mass spectrometry with soft electron ionization was used to examine the flames. Recent detailed chemical kinetic mechanisms for syngas combustion available from literature were used to simulate the experimental profiles with the CHEMKIN code. A compact kinetic mechanism including 11 species and 16 reactions was elaborated to reproduce the experimental data.
Thermocapillary rivulete structure in a flowing liquid film under conditions of constant wall temperature
Authors: Aktershev S P , Chinnov E A , Shatskiy E N 
Published: December 2019

Abstract
A stationary thermocapillary rivulet structure formed in a film of a liquid falling over a semi-infinite heater is theoretically and experimentally investigated. Nonlinear three-dimensional rivulets on the surface of a liquid film under constant wall temperature conditions are simulated numerically. It is shown that the developed rivulet structure varies very little downstream. The results of calculations for small and moderate Reynolds numbers are in good agreement with experimental data.
Experimental investigation of gas-liquid flow characteristics in slit rectangular and circular channels
Authors: Bartkus G V , Kuznetsov V V 
Published: December 2019

Abstract
This paper aims at the experimental study of the flow characteristics of the ethanol- nitrogen mixture in vertical and horizontal channels. The 95% ethanol and nitrogen were used as working liquid and gas accordingly in slit rectangular microchannel with cross-section of 200 × 2000 μm and in a circular channel with ID=2.2 mm. The hydraulic focusing and T-shape mixers were used for gas-liquid flow formation. Experimental data were obtained using highspeed visualization, laser scanning, μLIF, and PLIF methods. Using method μLIF the nonuniform thickness of the liquid film was obtained at the cross-section of the rectangular microchannel. For the circular channel, the measurements of the local film thickness using the PLIF method confirmed accordance of the experimental data with Taylor law.
On the peculiar properties of initiation and propagation of multifront detonation
Authors: Vasil’ev A A 
Published: December 2019

Abstract
At initiation an external source must initiate a chemical reaction in the combustible mixture and ensure its self-sustaining propagation over the whole volume of the mixture. Traditionally, the critical energy is considered as the measured value of successful initiation of a mixture, providing 100% excitation of the process – combustion or detonation. Actually, the initiation of combustion or detonation process has a “threshold” nature (“yes” – “no”). The spatial-temporal law of initiator energy allocation has a noticeable effect on the critical initiation energy. The instability of the system of equations of gas dynamics and chemical kinetics is manifested in the multifront nature of the detonation front and the cellular structure of the trajectories of the transverse waves. The important question is the moment and place of occurrence of such a structure, especially for expanding waves. Along with the kinetic- gasdynamic instability of the combustible mixture, a certain role is played by the instabilities introduced by the initiator: for example, the constrictive (sausage) electromagnetic instability of an electric conductor with a current, the Meshkov-Richtmeier instability at the expanding boundary of the liquid metal of the exploding wire, etc. In this report the existing problems of initiation and propagation of detonation are discussed based on modern data, including the results of the author’s research on these issues.
Experimental study of the control agent flow parameters in the channel, simulating the ramjet air flow duct
Authors: Maslov E A , Faraponov V V , Zharova I K , Zhukov A S , Kozlov E A , Savkina N V , Skibina N P , Gimayeva N R 
Published: December 2019

Abstract
This article presents the results of the experimental study of heat transfer when the supersonic air flow interact with the surface of the ramjet model air flow duct in the range of Mach numbers M = 5 – 7. Experimentally obtained temperature distribution along air flow duct of a ramjet shown. The temperature along the axisymmetric model of the air flow duct was measured using the designed hot probe. Distribution of the Mach number along the symmetry axis of the model air flow duct is obtained numerically. A comparison of the numerical and experimentally obtained values of the Mach number showed their satisfactory agreement
Numerical research of heat transfer processes at the drilling wells in permafrost rocks
Authors: Minakov A V , Pryazhnikov M I , Mikhienkova E I , Neverov A L , Matveev A V , Zhigarev A V , Guzei D V 
Published: December 2019

Abstract
Systematic numerical studies of processes that affect the rate of thawing during drilling of oil and gas wells in permafrost have been carried out. The influence of flow rate, temperature, drilling fluid rheology and drilling duration on the rate of permafrost thawing is studied. To reduce the rate of thawing, the use of polymer drilling fluids with additives of ethylene glycol is proposed.
Gas-liquid flow characteristics variation along inclined flat channel
Authors: Gorelikova A E , Pakhomov M A , Randin V V , Terekhov V I , Chinak A V 
Published: December 2019

Abstract
The results of an experimental study of bubble diameters variation with distance from the point of gas injection in an upward bubble flow in an inclined flat channel are presented. The measurements were carried out for a superficial fluid velocity of 0.51 m/s (Re=12400) and at various values of the gas flow rate ratio. It is shown that at small values of the gas flow rate ratio (β <2%), the coalescence of bubbles is practically absent, therefore the angle of inclination of the channel and the distance from the point of introduction of gas into the liquid flow do not affect the average diameter of gas bubbles.
On the explosiveness of suspensions of sulfide ore dust in air in shock waves
Authors: Pinaev A V , Pinaev P A 
Published: December 2019

Abstract
The explosiveness of suspensions of several powders of sulfide ores with a particle size of 1-5 μm in air is experimentally investigated. The air suspension is affected by high-temperature gas detonation products and shock waves with a temperature behind the front exceeding the pyrrhotite ignition temperature. Data on the changes in the content of chemical elements and compounds in ore powders after their exposure to shock waves are obtained by means of X-ray diagnostics. The effect of the air suspension on the parameters of incident and reflected shock waves is determined.
Combustion and detonation waves in methane mixtures with suspensions of fine coal particles
Authors: Pinaev A V 
Published: December 2019

Abstract
Combustion and detonation waves in hybrid systems of gas mixtures CH4/air with suspensions of coal particles 1–200 μm in size in a vertical shock tube (70 mm in diameter and 6.75 m long) are studied experimentally. The structure and parameters of the waves in gas mixtures without coal dust and in the same mixtures containing suspensions of a coal powder with a mean-volume density of 23–534 g m–3 are compared. XRD patterns of the coal powder are analyzed.
Numerical simulation of the crystallization front propagation during the bottom cooling of a flat layer of water
Authors: Guselnikova O O , Kislitsyn SA , Berdnikov V S , Mitin K A 
Published: December 2019

Abstract
The process of crystallization of water after a sudden cooling of the bottom of a rectangular cavity is investigated by numerical simulation of conjugate convective heat exchange using the finite element method. Detailed information has been obtained on hydrodynamics, temperature fields, and the forms of the crystallization front. The crystallization of water is studied by taking into account the dependence of the density on the temperature and heat of the phase transition. Numerical studies are carried out using a proprietary software package. Adaptive triangular grids are used to track the position of the crystallization front at each time step.
Investigation of heat and mass transfer in sublimation of solid particles
Authors: Bochkareva E M , Miskiv N B , Lukashov V V 
Published: December 2019

Abstract
The paper presents the results of an experimental study of heat and mass transfer during the sublimation of single spherical particles of metal-organic compounds in an inert gas flow. A technique for manufacturing samples of a binary mixture of Y(dpm)3 and Zr(dpm)4 is shown. As a result of the research, it was found that heat transfer does not depend on the method of sample preparation, but the front of sublimation becomes three-dimensional much faster for the samples prepared without solvent. It should be noted that after reaching thermal equilibrium, the size of the sample stabilizes and subsequently changes only slightly.
Experimental study of the combustion of artificial methane hydrate at different rates of external gas flow
Authors: Morozov V S 
Published: December 2019

Abstract
The dissociation behavior of methane hydrate was experimentally investigated in the presence of a laminar air flow in a channel of constant height. The dissociation rate (J) increases with increasing air velocity (U
a) in the range of velocity values 0.5–0.7 m/s and decreases with increasing velocity. When simulating the combustion of methane hydrate, it is necessary to take into account the strong temperature irregularities on the surface of the powder layer. The area of maximum temperature and maximum rate of dissociation is located near the side walls of the tank.
Experimental modelling of boric acid crystallization process during emergency core cooling of NPP with WWER
Authors: Shlepkin A S , Sakhipgareev A R , Morozov A V 
Published: December 2019

Abstract
The results of experimental study of boric acid crystallization in WWER reactor in case of loss of coolant accident (LOCA) and operation of passive safety systems are presented. Description of the test facility and the experimental technique are given. The results of the visual observation of process of boric acid crystallization from the solutions with initial concentrations 371 and 466 g kg−1 H2O are presented.
Investigation of characteristics of diesel fuel atomization with a high-speed gas jet
Authors: Sharypov O V , Anufriev I S , Shadrin E Yu , Kopyev E P , Leschevich V V 
Published: December 2019

Abstract
Using the modern contactless interferometric method for determining the droplet diameter (IPI), a gas-drop flow was experimentally investigated when diesel fuel is atomized with a high-speed gas jet. The size distribution of fuel drops was obtained in different operating parameters. The dependences of drop sizes on regime parameters are revealed and analyzed.
Numerical simulation of the Rayleigh-Taylor instability in rarefied Ar/He mixture using the Direct Simulation Monte Carlo method
Authors: Kashkovsky A V , Kudryavtsev A N , Shershnev A A 
Published: December 2019

Abstract
The Direct Simulation Monte Carlo method is used to study the emergence and development of the Rayleigh-Taylor instability. At the initial time, the heavier gas (argon) was located above the lighter gas (helium). In the simulation, no initial perturbations were superimposed on the interface, the appearance of instability was caused by fluctuations of gas- dynamic parameters that are inherent in the Direct Simulation Monte Carlo calculations. The onset of large-scale movement and mixing processes are investigated. Quantitative characteristics of the evolution of the Rayleigh-Taylor instability in a rarefied mode are obtained.
Analysis of diffusion processes in a phonon gas
Authors: Khvesyuk V I , Qiao W , Barinov A A 
Published: December 2019

Abstract
Diffusion processes in a phonon gas were studied in a wide temperature range in the application to silicon. To provide this analysis we develop a new method of computation based on the kinetics of phonon gas in combination with Monte Carlo simulation. This model for the first time allows one to obtain the diffusion coefficients, the influence of different types of interaction processes of phonons on diffusion and other information about processes in phonon gas. Presented method is useful in the study of heat transfer in nanostructures.
DSMC simulation of hydrogen dissociation on wire surface in resting gas
Authors: Plotnikov M Yu , Shkarupa E V 
Published: December 2019

Abstract
In the present work, the specific features of the simulation of hydrogen dissociation on the surface of a heated wire in a resting gas by the direct simulation Monte Carlo (DSMC) method were studied. The influence of the boundary conditions on the processes occurring near the wire, in particular, on the rate of atomic hydrogen production, was studied. The obtained data were compared with the experimental data.
The study of the temperature distribution in the driving device material during high-speed acceleration
Authors: Zubashevskii K M , Guskov A V , Hrebtova M S , Milevskii K E 
Published: December 2019

Abstract
Driving device (DD) provides functional interaction of the product with the slot profile of the guide pipe during high-speed acceleration. During the sliding period, the DD material provides contact with the slideway pipe and is heated to high temperatures, which change the mechanical properties of the DD material. In this paper, a study of the temperature distribution in the copper and steel leading devices, numerical simulation of the temperature distribution deep into the device materials were held. The distributions are presented in the graphical form.
Steady-state flow of a power-law fluid between two coaxial cylinders taking into account the temperature dependence of the rheological parameters and the viscous dissipation
Authors: Borzenko E I , Ryltseva K E , Shrager G R 
Published: December 2019

Abstract
The non-isothermal power-law fluid flow between two coaxial cylinders under the pressure drop providing a specified flow rate is studied with allowance for the viscous dissipation of the mechanical energy and dependence of the rheological parameters on temperature. The flow regime is assumed to be laminar. Mathematical formulation of the problem includes the dimensionless equations of motion and energy. The no-slip conditions are used on the channel walls while the temperature and the heat flux are assigned on the outer and inner walls, respectively. The stated problem is solved numerically with the use of the finite-difference method to discretize the equations. A tridiagonal matrix algorithm is applied to solve the obtained system of algebraic equations. The parametric investigation of the kinematic, dynamical, and thermo-physical characteristics of the flow is carried out.
Misconception profile of students in senior high school iv Sidoarjo East Java in work and energy concepts and the causes evaluated using Four-Tier Diagnostic Test
Authors: Ermawati F U , Anggrayni S , Isfara L 
Published: December 2019

Abstract
The main issue faced by students in secondary high schools in Indonesia is the difficulties in understanding physics concepts. These difficulties are often caused by a conflict between preconceptions and academic knowledge obtained from school. For example, students’ preconceptions says that Work is an effort by exerting energy and thought. In physics, Work is the dot product between force and displacement vectors whose value is determined by the angle between those vectors. This conflict phenomenon is assured to produce misconceptions. This present study aims to analyse the 10th grade students’ misconception profile in Senior High School IV Sidoarjo East Java on Work and Energy concepts and to identify the sources examined using the developed four-tier multiple-choice test. A total of 30 students participated in this study. The data collection instrument contains 25 physics-concepts questions. Serious misconceptions was identified on Work, Energy Change and Mechanical Energy Conservation concepts as a result of preconceptions. Meanwhile, the similar misconceptions found on Power concept was due to incomplete reasoning.
Needs analisys pedagogy project management of technology and vocational educational with the approach of project base learning in higher education
Authors: Giatman M , Nafsiah I N , Rizal F , Leonardo A 
Published: December 2019

Abstract
This research aims to analyze the needs of the pendagogi on the project management courses in building engineering education State University of Padang. This needs analysis look deeply the importance of project management courses in building engineering education from the aspect of the curriculum, pedagogy and learning materials based on current conditions, standard processes and priorities in learning. This type of descriptive study with survey method. With the spread of data gathering techniques questionnaires and interviews. Sample student research educator and lecturer of building engineering. Data analysis techniques was kuantitaf and interviews. Based on the results of the analysis it can be concluded that (1) there is a gap between the needs of the students and professors against the learning model of project management related methods, approaches, learning materials, assessment and evaluation of student learning (2) requires the development of a learning model that supports and meningkatakan knowledge, skills and attitudes.
The Use of Application Neuroscience in Facing the Industrial Revolution 4.0 the Principals of Senior high School Over the Branch of the Education Department
Authors: Asfiati  
Published: December 2019

Abstract
Industrial revolution produces the changes of mindset, work methods, and patterns of building harmonious relationships between community groups and organizations. The principal as the leader of the organization must be able to face the industrial revolution. Facing the industrial revolution can be done by applying neuroscience in the practice of leadership management education. The neuroscience application creates synergy and engagement with high added value. This study aims to determine the principal’s leadership in facing the industrial revolution by applying neuroscience. Research method using a two-stage approach: Qualitative and quantitative. The quantitative design uses the pre-test and post-test. The finding research is the principal applying neuroscience before knowing the theory showed a significant toward industrial revolution 4.0 where the experimental class t counted 15,649> from t table 2.037 in the control class pre-test and post-test that t count 5.131> from t table 2.040. This shows that it is important to apply neuroscience in order to realize good managerial demands according to the industrial revolution 4.0.