bluuebunny/crossref_metadata_2025_split huggingface dataset:
Heat transfer enhancement in superheated hydrocarbon fluids due to traces of water
Authors: Lukianov K V , Kotov A N , Starostin A A 
Published: November 2021

Abstract
For the specific mode of pulse heating of a wire probe immersed in a test liquid (saturated hydrocarbon), the effect of enhancement of the heat transfer through the probe surface has been revealed. The characteristic heating time is from 10 to 20 ms. The objects of research are n-hexane, n-decane, and n-hexadecane. It is shown that the addition of 0.003% water increases the heat transfer to 10% in the course of approaching the boiling-up temperature of liquid. Simulation of the experimental conditions shows the possibility of microconvection in the most heated boundary layer of a liquid about 10 μm thick.
Study of the Leidenfrost Effect on Heterogeneous Surfaces of Complex Structure
Authors: Makarov P G , Artamonov A V , Dmitriev A S 
Published: November 2021

Abstract
This work is devoted to a research of water droplets that are put in-between two parallel metal strings the distance between which is comparable to linear size of the droplet. Strings are heated by Joule heating to temperatures that exceed critical temperatures of nucleate and film boiling. Different configurations of strings’ side surface have been tested: smooth and with winding made of the same material (intermittent and uninterrupted). Experiments have shown that droplets on these types of surface do not boil away quickly or fall down. Instead they displayed behavior that can be described as floating, either stable or with directed motion, depending on surface structure or relief. Multiple experiments have shown that it is quite similar to Leidenfrost effect demonstrated on a flat overheated surface by liquids.
Effect of dustiness in atmospheric air on the formation and characteristics of condensation aerosol
Authors: Mayorov V O , Yastrebov A K , Yu Levashov V 
Published: November 2021

Abstract
In this work, the simulation of the formation process of condensation aerosol in atmospheric air is carried out. The influence of the initial supersaturation ratio and dustiness content on the formation mechanism and macroscopic characteristics of the aerosol is investigated.
Development of an automated system for experimental investigation of thermal processes in a hydrogen-oxygen steam generator
Authors: Molotov I M , Schastlivtsev A I , Yamshchikova L V , Molotova I A 
Published: November 2021

Abstract
The paper presents the results of the development and creation of an automated system of scientific research (ASSR). It provides experimental studies of heat and mass transfer processes in a hydrogen-oxygen steam generator (HOSG). The most relevant fields of application of hydrogen-oxygen steam generators are considered. The paper discusses the most relevant areas of application of hydrogen-oxygen steam generators, scientific and technical barriers to the introduction of technology and the features of the construction of ASSR for experimental research. The schematic diagram of the primary measuring transducers and the control mechanisms of the experimental stand are described. The choice of the configuration of the automated control and measurement system is justified from the point of view of completeness and reliability of the obtained data.
Effect of high-temperature oxidation on the surface properties as applied to quenching of high-temperature bodies
Authors: Molotova I A , Zabirov A R , Yagov V V , Terentyev E V , Antonov N N , Molotov I M , Tumarkin A V , Kharkov M M 
Published: November 2021

Abstract
This paper contains the results of studying the surface properties before and after high-temperature oxidation. For this, the plate zirconium samples with chromium, gold and silver coatings were prepared. Cut profiles of the samples were obtained to study the structure of coatings and the thickness of the oxide layer. The measurements of contact angles were carried out. The results showed that a porous heterogeneous oxide layer was formed on the samples after high-temperature oxidation. At the same time, the wettability of the samples was improved. The thickness of the oxide layer on the chrome-coated zirconium sample was the smallest. Using of electroplated silver coating for experiments involving heating to high temperatures seems inappropriate because it was damaged after the oxidation tests. It is assumed that the main factor which influence on the rise of the transition temperature to the intensive cooling regime during quenching is the appearance of the oxide layer, rather than the improved wettability and wickability. High-temperature oxidation leads to the simultaneous formation of an oxide layer with a low thermal effusivity and to an improvement in wettability, therefore the contribution of each of these two effects on quenching can be confused or overestimated.
Experimental study of the adiabatic wall temperature of a cylinder in a supersonic cross flow
Authors: Popovich S S , Kiselev N A , Zditovets A G , Vinogradov Y A 
Published: November 2021

Abstract
The results of an experimental study of the adiabatic wall temperature for a supersonic air flow across the cylinder are presented. The temperature was measured contactlessly using an InfraTEC ImageIR 8855 thermal imager through a ZnSe infrared illuminator. The freestream Mach number was 3.0, input flow total temperature was 295 K, and the total pressure 615 kPa. The Reynolds number calculated from the cylinder diameter (30 mm) was about 106. It is shown that it is possible in principle to determine the high-speed flow total temperature by defining the maximum temperature of a cylindrical probe at the front critical point. Thermograms of the wall temperature distribution along the profile of the cylinder were obtained. The research was performed at the experimental facilities of the Institute of Mechanics of Lomonosov Moscow State University.
Enhancement of heat transfer for boiling in nanofluid
Authors: Sapozhnikov S Z , Yu Mityakov V , Pavlov A V , Bobylev P G , Andreev Yu V , Proskurin V M , Vinogradov M D 
Published: November 2021

Abstract
The paper considers heat transfer during boiling of subcooled water with suspended nanoparticles Al2O3 using a suspension from 0.32% to 4%. On a spherical model, the local heat flux per unit area was measured by the method of gradient heatmetry for model temperature of 464 °C and water temperature of 64 °C. The results are compared with the data obtained at the same temperature conditions for pure water. Enchancement of heat transfer was revealed in the entire concentration range - with a maximum at a particle concentration close to 1%.
Heat transfer enhancement during condensation of water steam on inclined pipe
Authors: Sapozhnikov S Z , Yu Mityakov V , Mityakov A V , Yu Babich A , Zainullina E R 
Published: November 2021

Abstract
This paper presents experimental study of heat transfer during film condensation of saturated water steam on the outer surface of the inclined pipe by gradient heatmetry. Heat flux per unit area was measured by gradient heat flux sensors made of a single-crystal bismuth. The experimental results are presented in the graphs of heat flux per unit area dependence on time and azimuthal angle. The highest average heat transfer coefficient during condensation of α = 6.94 kW/(m2 • K) was observed when the pipe was inclined at the angle of ψ = 20 °. This value exceeds one obtained on a vertical pipe by 14.9 %. Heat transfer enhancement during condensation of saturated water steam on inclined pipe is associated with changes in condensate film flow. Another part of experiments was made by simultaneously using of gradient heatmetry and condensate flow visualization. Experimental results confirmed the applicability and high informative content of proposed comprehensive method. Comprehensive study of heat transfer during condensation confirmed that heat flux per unit area pulsations may be explained by the formation of individual drops, their coalescence, and drainage from the sensor surface.
A map of regimes of evaporation and boiling in the horizontal liquid layer on the modified surface
Authors: Shvetsov D A , Pavlenko A N , Brester A E , Zhukov V I 
Published: November 2021

Abstract
The paper presents the results of the study of the evaporation and boiling regimes in thin horizontal layers of liquid on a modified surface in a wide range of changes in the pressure and height of the liquid layer. Depending on the heat flux, pressure, and height of the liquid layer, the formation of various structures was observed. In this paper, maps of the evaporation and boiling regimes are obtained, which show the heat fluxes from the natural convection regime up to the boiling crisis, depending on the height of the liquid layer. The results are compared with the calculation dependencies.
International Conference “Advanced Element Base of Micro- and Nano-Electronics with Using of To-Date Achievements of Theoretical Physics” 20-23 April 2021, Moscow, Russia
Authors: Belyaev V V , Chausov D N , Kuznetsov M M 
Published: November 2021

Abstract
A brief description of scientific program and papers of International Conference “Advanced Element Base of Micro- and Nano-Electronics with Using of To-Date Achievements of Theoretical Physics” is presented. It is an annual conference of Moscow Region State University (MRSU).
List of Organizing Committee, Program Committee are available in this pdf.
A software package for modeling the propagation of dynamic wave disturbances in heterogeneous multi-scale media
Authors: Khokhlov N. 
Published: November 2021

Abstract
The paper considers a software package designed to simulate the propagation of dynamic wave disturbances in heterogeneous media. One of the main features of the considered software package is numerical algorithms with an explicit selection of inhomogeneities. Within the framework of the work, such inhomogeneities as pores, fractures and interfaces between media (contact boundaries) are considered. The considered algorithms make it possible to perform calculations in different scale settings in micro and macro sizes. The mathematical model is based on the equations of the linear theory of elasticity. For the calculation, block structural meshes are used. The software package is parallelized using MPI and OpenMP technologies. Separate parts of the algorithm are parallelized using graphics accelerators such as GPGPU. The paper describes the features of the algorithms under consideration and provides examples of calculations that demonstrate the capabilities of the algorithm.
Diagnostics of atomic- molecular interactions in nano-compositions organics-inorganics by means of infrared spectroscopy
Authors: Azhgalieva A S , Klassen N V , Likhter A M , Pokidov A P , Fursova T N , Tsebruk I S 
Published: November 2021

Abstract
This paper prolongs our studies of the formation and properties of the organic-inorganic scintillating compositions from activated polystyrene and inorganic nanoparticles from cesium iodid and sulfate. The compositions from the solution of polystyrene in benzene and nano- or micro-particles of cesium iodide were solidified in the form of thin films. Then some of the films were subjected to rolling. The variations of the infrared transmission spectra of the compositions were measured either during their solidification or after the solidification and rolling. The new absorption band was revealed in the process of the solidification and disappeared after it. The fractal-like structures of parallel rows were formed in the films. Quasi-periodical oscillations of the transmission spectra were found in several infrared regions ascribed to the interaction of the infrared radiation with the fractal super-structure of the films. The modifications of the absorption spectra found in our experiments are attributed to the interactions of polystyrene molecules with benzene molecules and nanoparticles of cesium iodide.
Synthesis of rare-earth nanosized phosphors using microwave processing
Authors: Vlasenko A B , Bakhmetyev V V 
Published: November 2021

Abstract
Nanomaterials find permanently extending applications in various areas of life. In particular, nanosized phosphors can be used as pharmaceutical carriers capable of emitting ultraviolet or visible light that activates a photosensitizer, thus significantly expanding the possibilities of photodynamic therapy in the treatment of oncological, bacterial and viral diseases. The conditions required for the use of nanosized phosphors in medicine include their fine dispersion and effective luminescence in the red region of visible light spectrum upon stimulation by X-ray radiation of the range accepted for medical applications, particularly for diagnostic and therapeutic purposes in many diseases. The aim of this work was to study the effect of microwave treatment of Y2O3:Eu phosphors prepared by hydrothermal synthesis in ethylene glycol at 230 °C for 6 hours, involving the decomposition of mixed acetate. In order to reduce the aggregation and growth of the resulting particles, Aerosil A300 with average particle size 7 nm was added to the reaction mixture in the course of hydrothermal synthesis in the ratio 1:1 relating to the obtained phosphor. The microwave treatment was carried out at 800 °C for 5 minutes. The developed method provided Y2O3:Eu phosphor samples featuring with increased luminescence intensity in the region 610…700 nm compared to similar phosphors earlier prepared using the rapid thermal annealing (RTA) procedure.
Anomalous transport of electrons in an electric discharge with transverse magnetic field
Authors: Kirdyashev K P 
Published: November 2021

Abstract
The experimental data showing the relationship of excitation of microwave oscillations with abnormally transport of electrons across the magnetic field in turbulent plasma are presented. The mechanism of the formation of the discharge current due to scattering of drift electrons in the near-electrode layers of the electric discharges on microwave oscillations has been substantiated. The conditions for the manifestation of the turbulent mechanism of anomalous electron transport through the magnetic barrier at the boundary of the toroidal electric discharge have been studied most fully. The mobility of electrons across a magnetic field is one of the main parameters of electric discharges that use crossed electric and magnetic fields for technological purposes.
On the Problem of Synchronization of Virtual and Real Movements for Virtual Reality Systems
Authors: Chertopolokhov V A 
Published: November 2021

Abstract
An immersive experience in modern virtual reality systems requires adjusting of various parameters. This report focuses on the problem of virtual representation of real movements of objects in space. Separately, a special class of problems is highlighted: synchronization of visual and dynamic imitation for virtual reality systems and motion platforms. Modern mass-produced virtual reality headsets do not allow effective tracking of human movements on a moving base using standard software. The element base and algorithms necessary for the successful solution of this problem are presented.
Methods of teaching physics in the conditions of online interaction
Authors: Dankin D G 
Published: November 2021

Abstract
The article discusses the problems of education caused by the pandemic and the possibilities of electronic educational tools. The challenges of the period that 2020 brought sharply accelerated the development of electronic educational tools, at the same time, revealed the limitations of student control tools. The author of the article worked in the educational system of a school, university and pre-university training in the spring of 2020. This article discusses three options for implementing online classes. All three of these systems have switched to the electronic form of online classes, although this situation was not initially foreseen. The problems that one had to face in the work and the successful moments of the studying in the information educational environment are described. Prospects for the development of online learning are outlined.
The use of electronic technologies in medicine
Authors: Damulin I V , Strutzenko A A 
Published: November 2021

Abstract
The active devoted of the information technologies in medicine significantly facilitates the work of a doctor, but also creates a number of problems. One of them is related to the use in practice of documents on electronic media, including electronic medical records, and is related to personal information about the patient, which is strictly confidential and which can be stolen by unauthorized access using the capabilities of the Internet and especially social networks. Another problem associated with the use of electronic media is the possibility of uncontrolled introduction of false or erroneous information about the patient. One way to avoid mistakes associated with transferring information about one patient to an electronic document of another is to strictly identify each block of information. The importance of modern distance and multimedia teaching methods in the teaching process is emphasized. It is concluded that the future development of medical education in general, and the teaching of nervous diseases in particular, is associated with the combination of traditional methods with the capabilities of modern technical methods. Despite all the objective difficulties, it is vital to correct the situation. And here the professional experience of the doctor plays an important role. Given the fact that the use of these technologies is expanding more and more every year, the understanding of the complexities associated, with the ethical component of these methods, must be taken into account now.
Numerical simulation of the interaction of the disturbed boundary layer with an incident shock
Authors: Khotyanovsky D V , Kudryavtsev A N , Kutepova A I 
Published: November 2021

Abstract
Interaction of the disturbed supersonic boundary layer with an incident oblique shock wave is studied numerically with eddy-resolving numerical simulations. Eigenmodes of the linear stability theory are used to generate the inflow boundary layer disturbances. The evolution of unstable boundary-layer disturbances, effects of the incident shock on the disturbances, effects of the disturbances on the boundary layer separation, flow dynamics in the separation zone, and laminar-turbulent transition are studied.
Investigating heat transfer in an upward flow of liquid metal in the mercury facility with a loop of natural circulation
Authors: Luchinkin N A , Razuvanov N G , Sardov P A , Polyanskaya O N 
Published: November 2021

Abstract
Research of heat transfer is performed in an upward flow of liquid metal in a vertical channel of rectangular cross-section under the condition of one-sided heating and in a vertical pipe in a mercury circuit with a natural circulation loop. Natural circulation loop enables measurements in mixed turbulent convection modes, which are inaccessible on a contour with a forced convection, that is, in the region of small Reynolds (Peclet) numbers of characteristics. Using a two-coordinate probe with a microthermocouple correlation sensor, profiles of averaged velocity and temperature and distribution of a wall temperature are obtained, and heat transfer coefficients are determined. Criterion dependences of Nusselt number on Peclet and Richardson are built. Experimental data on heat transfer are compared with similar data obtained earlier in a loop with a forced flow of mercury.
Numerical study of gas dynamics and heat transfer in matrix channels at various rib angles
Authors: Barsukov A V , Terekhov V V , Terekhov V I 
Published: November 2021

Abstract
The results of numerical simulation of the separation flow in matrix channels by the RANS method are presented. The simulation is performed at the Reynolds number Re = 12600, determined by the mass-average velocity and the height of the channel. The distribution of the local Nusselt number is obtained for various Reynolds numbers in the range of 5÷15⋅103 and several rib angles. It is shown that the temperature distribution on the surface is highly nonuniform; in particular, the maximum heat transfer value is observed near the upper edge facets, in the vicinity of which the greatest velocity gradient is observed.
Investigating the effect of submerged impingement jet on heat transfer in water-alcohol mixtures
Authors: Kanin P K , Gubanova T A , Zabirov A R , Yagov V V 
Published: November 2021

Abstract
This paper presents new results of experiments on spherical sample cooling with submerged impingement jet in subcooled water-alcohol mixtures. The influence of the ethanol concentration on the occurrence of intensive boiling regime is detected. Experiments are carried out on a stainless-steel sample in a water-ethanol mixture, in a wide range of concentrations and temperatures. The result includes an increase of the heat transfer intensity at exposure of the submerged impingement jet. The intensive boiling regime is detected with a higher ethanol content compared to experiments in a calm liquid.
Experimental study of the local structure of a bubble flow in a flat channel with sudden expansion
Authors: Chinak A V , Evdokimenko I A , Kulikov D V , Lobanov P D 
Published: November 2021

Abstract
The hydrodynamic structure of the flow in a flat channel with sudden expansion was studied at constant flow rates of liquid and gas in the vertical flow at Re = 6600 and gas content β = 0.03. The measurements were carried out using the PLIF method; and with this view, fluorescent particles for PIV studies and the dye Rhodamine G were added to distilled water. An optical threshold filter was installed on the lens of the video camera. When processing images to obtain data on the local gas content, only bubbles falling into the plane of the laser beam were considered (the boundary glows, casting a shadow).
Regularities of vortex motion in gas-vortex bioreactor
Authors: Sharifullin B R , Naumov I V , Tsoy V A , Skripkin S G 
Published: November 2021

Abstract
Regularities of the vortex motion in an industrial glass bioreactor with a volume of 12 liters with a reactor vessel diameter D = 190 mm and with a filling of 50% was studied. A 65% water solution of glycerin was used as a model culture medium (density ρ
g
= 1150 kg/m3 and kinematic viscosity Vg
= 15 mm2/s). Methods of particle image velocimetry and adaptive track visualization were used to observe the vortex pattern. The regularities of the vortex motion of the cultural medium were determined. It was found that, similar to the case of two rotating immiscible liquids, a strongly swirling jet was formed near the axis, and the entire flow took on the structure of a miniature gas-liquid tornado. The aerating gas interacted with the liquid only through the free surface, without mixing with it. As a result, the intensification of interphase mass transfer was provided due to the high speed of motion of the aerating gas.
Thermal expansion of solid solutions of the Pb(Zr,Ti)O3 system near lead zirconate
Authors: Andryushin K P , Andryushina I N , Shilkina L A , Reznichenko L A 
Published: November 2021

Abstract
Ferroelectric ceramic materials based on the Pb(Zr,Ti)O3 (PZT) system were obtained by two-stage solid-phase synthesis followed by sintering using conventional ceramic technology. On the basis of the studies correlations between the thermal expansion and structural parameters of the investigated solid solutions were established. It was concluded that the obtained data are recommended to be used in the development of devices based on solid solutions with the participation of the PZT system.