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Effect of the amorphous germanium film thickness on the process of gold-induced crystallization 非晶锗膜厚度对金诱导结晶过程的影响
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-25 DOI: 10.1134/S0869864324060192
A. O. Zamchiy, V. A. Nepomnyashchikh, V. O. Konstantinov, E. M. Starinskaya, V. A. Volodin, E. A. Baranov
{"title":"Effect of the amorphous germanium film thickness on the process of gold-induced crystallization","authors":"A. O. Zamchiy,&nbsp;V. A. Nepomnyashchikh,&nbsp;V. O. Konstantinov,&nbsp;E. M. Starinskaya,&nbsp;V. A. Volodin,&nbsp;E. A. Baranov","doi":"10.1134/S0869864324060192","DOIUrl":"10.1134/S0869864324060192","url":null,"abstract":"<div><p>Results of an experimental study of gold-induced crystallization of thin films of amorphous germanium (a-Ge) are reported. The Raman spectroscopy and optical microscopy are applied to study the influence of the initial thickness of the a-Ge film on the morphology of the material obtained by means of annealing of bilayer Au/a-Ge structures. The a-Ge/Au thickness ratios equal to 1.1 and 2.3 are considered. Low-temperature annealing of quartz/Au/a-Ge samples is performed in a high-vacuum atmosphere (10<sup>−4</sup> Pa) at a temperature of 300°C for 24 h. The Raman spectroscopy results show that sample annealing leads to complete crystallization of a-Ge with formation of polycrystalline germanium (poly-Ge) in both bottom and upper layers of the samples. For the sample with a-Ge/Au = 2.3, a continuous poly-Ge film is obtained on the substrate due to implementation of the layer exchange mechanism. In this case, poly-Ge hillocks are formed in the upper layer of the sample due to a-Ge crystallization in the presence of Au. For the sample with a-Ge/Au = 1.1, a non-continuous poly-Ge film with a coverage degree of 30 % is formed in the bottom layer. The poly-Ge material is formed in the upper layer due to the processes of “explosive” crystallization and secondary crystallization induced by Au.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 6","pages":"1271 - 1276"},"PeriodicalIF":0.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New density calculation method for aircraft icing based on wind tunnel experiments and 3D micro-structure modeling 基于风洞实验和三维微结构建模的飞机结冰密度计算新方法
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-11 DOI: 10.1134/S0869864324040255
Weibin Li, Dazhi Zhao, Chao Song, Fan Liu, Lu Zhang
{"title":"New density calculation method for aircraft icing based on wind tunnel experiments and 3D micro-structure modeling","authors":"Weibin Li,&nbsp;Dazhi Zhao,&nbsp;Chao Song,&nbsp;Fan Liu,&nbsp;Lu Zhang","doi":"10.1134/S0869864324040255","DOIUrl":"10.1134/S0869864324040255","url":null,"abstract":"<div><p>Aircraft icing seriously threatens flight safety, thus studying its quantitative properties can provide a deep understanding of how icing occurs and how to treat it. In this paper, methods of 3D modeling for ice micro-structure and ice density calculation are proposed based on wind tunnel experiments. Firstly, a variational segmentation method is presented to extract the quantitative information of icing pores, and stochastic analysis of pores characteristic is implemented. Then a 3D model of the micro-structure is established based on the specific assumptions and the micro quantitative formation. Finally, the icing density can be easily obtained by the mixture density calculating method. In the experiments, the 3D modeling results of icing micro-structure and density calculation results under different icing conditions are given, which demonstrate the effectiveness of the proposed method. Furthermore, the influences of two parameters in the density calculation are analyzed to give a clear understanding of how the parameters work.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 4","pages":"901 - 914"},"PeriodicalIF":0.6,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heat transfer during water boiling on black silicon surfaces of different morphologies 不同形态黑硅表面水沸腾过程中的热传递
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S0869864324050184
O. A. Volodin, V. S. Serdyukov, E. A. Vyacheslavova, A. I. Baranov, I. P. Malakhov, S. V. Konev, I. A. Kosovskikh
{"title":"Heat transfer during water boiling on black silicon surfaces of different morphologies","authors":"O. A. Volodin,&nbsp;V. S. Serdyukov,&nbsp;E. A. Vyacheslavova,&nbsp;A. I. Baranov,&nbsp;I. P. Malakhov,&nbsp;S. V. Konev,&nbsp;I. A. Kosovskikh","doi":"10.1134/S0869864324050184","DOIUrl":"10.1134/S0869864324050184","url":null,"abstract":"<div><p>The paper presents experimental data on the effect of morphology of the black silicon superhydrophilic surface structure fabricated by plasma-chemical etching on heat transfer during pool boiling of water. Silicon surfaces with homogeneous and hybrid microstructures are investigated. Heat transfer experiments were carried out on pre-selected microstructured surfaces with the best characteristics of capillary wicking. It is shown that the critical heat flux (CHF) for a surface with a hybrid structure is approximately three times higher than the CHF for a smooth silicon surface (660 kW/m<sup>2</sup>), reaching a value of 1914 kW/m<sup>2</sup>, while the CHF for a surface with a homogeneous structure exceeds the CHF for a smooth surface by the factor of 2.4, reaching a value of 1568 kW/m<sup>2</sup>. At that, the maximum recorded heat transfer coefficient (HTC) of the surface with a homogeneous capillary structure, on the contrary, is the highest (77 kW/(m<sup>2</sup>K)), almost twice exceeding the heat transfer coefficients for the unmodified surface in the region of moderate heat fluxes. The surface with a hybrid structure demonstrates a delay in boiling incipience when compared with the results for a smooth surface, but with a further increase in the heat flux it significantly exceeds the HTC for the smooth reference surface, ultimately reaching a maximum value of 45 kW/(m<sup>2</sup>K) in the pre-crisis region.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"1097 - 1102"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mixing process modeling of single-phase different temperature counterflows in a Y-junction at NPU operational thermal parameters NPU运行热参数下y型结单相不同温度逆流混合过程建模
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S0869864324050044
A. E. Sobornov, R. R. Ryazapov, S. M. Dmitriev, A. V. Kotin, N. V. Matsin, S. S. Borodin
{"title":"Mixing process modeling of single-phase different temperature counterflows in a Y-junction at NPU operational thermal parameters","authors":"A. E. Sobornov,&nbsp;R. R. Ryazapov,&nbsp;S. M. Dmitriev,&nbsp;A. V. Kotin,&nbsp;N. V. Matsin,&nbsp;S. S. Borodin","doi":"10.1134/S0869864324050044","DOIUrl":"10.1134/S0869864324050044","url":null,"abstract":"<div><p>The results of experimental and computational studies for the coolant flows mixing at different temperatures for standard operational parameters of a nuclear power unit (NPU) are presented in this paper. Experiments were performed using an upgraded version of measurement model. This study defines a temperature filed in the mixing zone and offers the optimal set of operation parameters calculated from the condition of maximum temperature pulsation within the mixing zone. Simulation was performed using a software kit ANSYS Fluent. The grid model is based on the block structure in ANSYS ICEM code. Numerical simulation was performed for unsteady problem statement based on the LES WALE turbulence model. Analysis of simulation and experimental fields for flow velocity and temperature confirmed the validity of the developed numerical method. A qualitative compliance for the probability density distribution and the spectral-correlation characteristics for temperature signals in the mixing zone was observed. The spectral power density for calculated temperature and velocity distributions fits the case of 1D energy spectrum of developed isotropic turbulence.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"941 - 956"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vibrational excitation and bifurcation of a round jet at low Reynolds numbers 低雷诺数圆形射流的振动激发与分岔
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S0869864324050093
A. K. Shevchenko, S. N. Yakovenko
{"title":"Vibrational excitation and bifurcation of a round jet at low Reynolds numbers","authors":"A. K. Shevchenko,&nbsp;S. N. Yakovenko","doi":"10.1134/S0869864324050093","DOIUrl":"10.1134/S0869864324050093","url":null,"abstract":"<div><p>This paper presents the results of numerical simulation of a submerged jet leaving an orifice of diameter <i>D</i> with velocity <i>U</i>, when the nozzle is subjected to mechanical oscillations (vibrations) of frequency <i>f</i>. Vibrational excitation leads to jet bifurcation at Reynolds number Re = <i>DU/v</i> &gt; 50 in wide ranges of oscillation amplitude <i>Z</i><sub>0</sub>, Strouhal number St = <i>fD/U</i>, and it is similar to acoustic forcing. The obtained estimates of the characteristic jet thickness and its expansion angle <i>α</i> performed to study the influence of <i>Z</i><sub>0</sub>, Re, and St parameters allow identification of the optimal values St<sub>opt</sub> of the Strouhal number, at which the splitting process is most pronounced. The previously noted effect of an increase in angle <i>α</i> with an increase in the excitation amplitude and saturation after some threshold values of amplitude <i>Z</i><sub>0</sub> are confirmed. These results also indicate that with a decrease in Re, the threshold amplitude (above which saturation in <i>α</i> occurs) increases, and the maximum possible values of <i>α</i> drop significantly. The influence of Re on the optimal Strouhal number was found: with a decrease in Re from 3000 to 100, the St<sub>opt</sub> values drop significantly.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"995 - 1018"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evolution of acoustic disturbances in a chemically reacting gas mixture CO2/CO/O 化学反应气体混合物CO2/CO/O中声扰动的演化
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S0869864324050081
Yu. N. Grigoryev, I. V. Ershov
{"title":"Evolution of acoustic disturbances in a chemically reacting gas mixture CO2/CO/O","authors":"Yu. N. Grigoryev,&nbsp;I. V. Ershov","doi":"10.1134/S0869864324050081","DOIUrl":"10.1134/S0869864324050081","url":null,"abstract":"<div><p>On the basis of a complete system of acoustic equations, the evolution of acoustic disturbances in a high-temperature reactive mixture of carbon dioxide, carbon monoxide, and oxygen CO<sub>2</sub>/CO/O in the dissociation-recombination reaction, as well as in the nonequilibrium endothermic reaction of CO<sub>2</sub> dissociation and exothermic reaction of afterburning of carbon monoxide in oxygen, is investigated. A realistic single-temperature Arrhenius model of chemical kinetics is used. The values of thermodynamic parameters on the trajectory of hypersonic flight in the Martian atmosphere are taken as stationary environmental conditions. For the dissociation–recombination reaction with a negative thermal effect near chemical equilibrium in the asymptotic high-frequency limit, attenuation of acoustic disturbances is shown. Under the same conditions, acoustic disturbances amplify in the nonequilibrium exothermic reaction and attenuate in the nonequilibrium endothermic reaction.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"983 - 994"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modeling the process of mixing a gas-droplet wall jet with a heated turbulent flow in a cylindrical channel 模拟了气滴壁面射流与圆柱形通道内加热湍流的混合过程
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S086986432405010X
M. A. Pakhomov, V. I. Terekhov
{"title":"Modeling the process of mixing a gas-droplet wall jet with a heated turbulent flow in a cylindrical channel","authors":"M. A. Pakhomov,&nbsp;V. I. Terekhov","doi":"10.1134/S086986432405010X","DOIUrl":"10.1134/S086986432405010X","url":null,"abstract":"<div><p>Numerical modeling of the local flow structure and mixing process during injection of a gas-droplet wall jet into a turbulent heated air flow has been performed. The numerical solution is based on a system of axisymmetric Reynolds-averaged Navier–Stokes equations (RANS) taking into account the two-phase character of the flow. To describe the dynamics and heat and mass transfer in the dispersed phase, the Euler two-fluid approach is applied. A significant effect of the liquid mass concentration on the distribution of parameters over the channel cross section and thermal efficiency is shown. An increase in thermal efficiency reaches 30 % in the initial part of the channel and 200 % in its end part in comparison with a single-phase wall air jet.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"1019 - 1024"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of gas and particle flow impact on a target comprising a substrate and a mask with converging/diverging aperture under cold spraying 研究冷喷涂条件下气体和颗粒流对由基材和具有收敛/发散孔径的掩模组成的目标的冲击
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S0869864324050111
S. V. Klinkov, V. F. Kosarev, S. Yu. Usynin, V. S. Shikalov
{"title":"Study of gas and particle flow impact on a target comprising a substrate and a mask with converging/diverging aperture under cold spraying","authors":"S. V. Klinkov,&nbsp;V. F. Kosarev,&nbsp;S. Yu. Usynin,&nbsp;V. S. Shikalov","doi":"10.1134/S0869864324050111","DOIUrl":"10.1134/S0869864324050111","url":null,"abstract":"<div><p>This paper presents the results of experiments and simulation on the regularities of a high speed gas-particle flow impinging a complex target under conditions of cold spray deposition. The target consists of a substrate and an installed in front partition with conical converging/diverging perforation. Numerical simulation was performed using the ANSYS Fluent in the mode of single particles motion (without the influence of particles on the gas flow parameters). Also, the results obtained were compared with previously investigated penetration of gas-particle flow through a mask with a cylindrical perforation.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"1025 - 1037"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Results of experimental investigations of aerodynamic characteristics of a sharp cone aimed at creating a validation basis for testing computer programs and models 尖锥气动特性的实验研究结果，旨在为测试计算机程序和模型提供验证基础
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S0869864324050019
S. M. Bosnyakov, S. A. Glazkov, A. R. Gorbushin, D. Yu. Gusev, M. N. Klemeshova, E. A. Krapivina, S. V. Mikhailov, A. V. Semenov, Yu. G. Shvalev
{"title":"Results of experimental investigations of aerodynamic characteristics of a sharp cone aimed at creating a validation basis for testing computer programs and models","authors":"S. M. Bosnyakov,&nbsp;S. A. Glazkov,&nbsp;A. R. Gorbushin,&nbsp;D. Yu. Gusev,&nbsp;M. N. Klemeshova,&nbsp;E. A. Krapivina,&nbsp;S. V. Mikhailov,&nbsp;A. V. Semenov,&nbsp;Yu. G. Shvalev","doi":"10.1134/S0869864324050019","DOIUrl":"10.1134/S0869864324050019","url":null,"abstract":"<div><p>The results of an experimental study of the flow around a 10 ° sharp cone in two large-scale TsAGI wind tunnels are presented. The Mach and Reynolds numbers of the free-stream flow varied in a wide range of M = 0.2–6 and Re = 3–34 million. The drag, lift, and side force coefficients were measured. The behavior of the pitching, rolling, and yawing moment coefficients was studied. The distribution of static pressure on the cone surface and pressure fluctuations were analyzed. A physical model of the cone streamlining was constructed. An ordered system of data was prepared to contain both the results of experiments and test calculations, intended for the validation of computer programs and models.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"915 - 928"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of black silicon structure on capillary spreading of liquid 黑硅结构对液体毛细管扩散的影响
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-09 DOI: 10.1134/S0869864324050159
V. S. Serdyukov, E. A. Vyacheslavova, A. I. Baranov, I. V. Vladyko, O. A. Volodin
{"title":"Effect of black silicon structure on capillary spreading of liquid","authors":"V. S. Serdyukov,&nbsp;E. A. Vyacheslavova,&nbsp;A. I. Baranov,&nbsp;I. V. Vladyko,&nbsp;O. A. Volodin","doi":"10.1134/S0869864324050159","DOIUrl":"10.1134/S0869864324050159","url":null,"abstract":"<div><p>The paper presents the experimental results on capillary liquid spreading over superhydrophilic black silicon surfaces of various morphologies created by cryogenic plasma-chemical etching. Five samples of capillary surfaces with different microstructure characteristics were made, including two hybrid surfaces combining microstructuring of different heights. The morphology of surfaces and characteristics of their wetting with water were studied, including the Wi number, which characterizes the capillary absorption of liquid. It was found that a greater height of microstructures ensures better liquid spreading. The maximum values of the Wi number are achieved on hybrid surfaces with a greater density of “high” microstructures. The prospects of using hybrid capillary surfaces to increase the critical heat flux during water boiling are shown.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 5","pages":"1071 - 1079"},"PeriodicalIF":0.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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