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Experimental study of gas bubble evolution in liquid metal 液态金属中气泡演化的实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030120
N. A. Pribaturin, P. D. Lobanov, A. I. Svetonosov, A. S. Kurdyumov, A. V. Chinak, S. M. Volkov
{"title":"Experimental study of gas bubble evolution in liquid metal","authors":"N. A. Pribaturin,&nbsp;P. D. Lobanov,&nbsp;A. I. Svetonosov,&nbsp;A. S. Kurdyumov,&nbsp;A. V. Chinak,&nbsp;S. M. Volkov","doi":"10.1134/S0869864324030120","DOIUrl":"10.1134/S0869864324030120","url":null,"abstract":"<div><p>The experimental results on the structure of the two-phase “liquid metal-gas” medium in vertical channels depending on the gas flow rate and channel diameter are presented. Lead-bismuth melt at a temperature of 160°C was used as a liquid medium, and argon was used as a gas phase. Data were obtained on the shape of gas bubbles, temporary changes in the gas content in channels, histograms of gas content distribution, and features of the slug flow of gas in the metal melt.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"495 - 502"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821425","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
Dynamics of the temperature field in a massive substrate under the effect of a concentrated heat flux 集中热流作用下块状基底温度场的动力学特性
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030132
A. I. Fedorchenko, V. V. Terekhov, N. Yan Lun
{"title":"Dynamics of the temperature field in a massive substrate under the effect of a concentrated heat flux","authors":"A. I. Fedorchenko,&nbsp;V. V. Terekhov,&nbsp;N. Yan Lun","doi":"10.1134/S0869864324030132","DOIUrl":"10.1134/S0869864324030132","url":null,"abstract":"<div><p>The results of an analytical solution to the problem of heat distribution inside a massive solid sample with concentrated heat supply to this sample surface are presented. Analytical expressions for the non-stationary temperature distribution inside the body are obtained using the integral cosine Fourier transform and the Hankel transform. Examples of solution application for estimating the characteristic times of reaching the Chernov points Ac<sub>1</sub> and Ac<sub>3</sub> in model hypoeutectoid steels under the effect of laser radiation are presented. The application of this solution to calculating the cooling dynamics of ceramic Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> samples, affected by the air and water jets, is demonstrated.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"503 - 511"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821428","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 the gas-driven atomization for a steel material 钢铁材料的气体驱动雾化研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030181
D. V. Sergachev, V. I. Kuzmin, I. P. Gulyaev, S. P. Vaschenko
{"title":"Study of the gas-driven atomization for a steel material","authors":"D. V. Sergachev,&nbsp;V. I. Kuzmin,&nbsp;I. P. Gulyaev,&nbsp;S. P. Vaschenko","doi":"10.1134/S0869864324030181","DOIUrl":"10.1134/S0869864324030181","url":null,"abstract":"<div><p>Gas atomization is the major approach for production of metal powders. This method gives up to 70 % of the entire metal powder production. However, modern trends demonstrate new requirements to the particle size distribution. This drives the development of new methods for power production. In this study the plasma-jet atomization method was presented.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"557 - 562"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821412","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
Investigation of hydrodynamic characteristics of a stationary Taylor bubble at different velocities of a downward liquid flow 静止泰勒泡在不同向下流动速度下的水动力特性研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030168
O. N. Kashinsky, M. V. Alekseev, An. A. Lukyanov, A. S. Kurdyumov, P. D. Lobanov
{"title":"Investigation of hydrodynamic characteristics of a stationary Taylor bubble at different velocities of a downward liquid flow","authors":"O. N. Kashinsky,&nbsp;M. V. Alekseev,&nbsp;An. A. Lukyanov,&nbsp;A. S. Kurdyumov,&nbsp;P. D. Lobanov","doi":"10.1134/S0869864324030168","DOIUrl":"10.1134/S0869864324030168","url":null,"abstract":"<div><p>The flow around a stationary gas Taylor bubble at downward flow velocities from 0.15 to 0.3 m/s in a vertical tube with a diameter of 20 mm was experimentally and numerically studied. Three-dimensional calculations were performed using the VOF (volume of fluid) method in the OpenFOAM package with application of the unsteady <i>k</i>–<i>ω</i> SST turbulence model. Hydrodynamic characteristics of the flow were experimentally studied using the electrodiffusion method. The effect of flow velocity on the change in the shape of the gas Taylor bubble nose was shown. The calculated and experimental data were compared and their good agreement was shown. The distribution of velocities in liquid and gas was studied as well as the distribution of the liquid film thickness around a gas Taylor bubble. It is shown that the wall shear stress in the liquid film around a gas Taylor bubble does not depend on the downward flow velocity.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"531 - 546"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821410","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
Numerical study of heat transfer for a laminar Bunsen flame impinging on a flat surface 层流本生火焰撞击平面传热的数值研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030089
D. A. Slastnaya, M. Yu. Hrebtov, R. I. Mullyadzhanov, V. M. Dulin
{"title":"Numerical study of heat transfer for a laminar Bunsen flame impinging on a flat surface","authors":"D. A. Slastnaya,&nbsp;M. Yu. Hrebtov,&nbsp;R. I. Mullyadzhanov,&nbsp;V. M. Dulin","doi":"10.1134/S0869864324030089","DOIUrl":"10.1134/S0869864324030089","url":null,"abstract":"<div><p>This article presents the results of numerical simulation of heat transfer between a laminar axisymmetric methane/air flame and a cold flat wall. The simulation is performed for different distances between the nozzle exit and the surface, namely, for one, two, and three burner nozzle diameters. The flow evolution is calculated by the direct numerical simulation method with a detailed kinetic mechanism GRI-MECH 3.0. At a distance of three diameters, there is a significant reduction of heat flux close to the stagnation point due to a local recirculation zone formation between the flame cone and the wall. This phenomenon explains the observed decrease in local heat transfer. The obtained numerical results well agree with the previous flame study by planar optical methods.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"465 - 468"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821430","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
Aeromechanics of the local zone of influence of a gas infrared emitter 气体红外辐射器局部影响区的空气力学
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S086986432403003X
B. V. Borisov, G. V. Kuznetsov, V. I. Maksimov, T. A. Nagornova, S. O. Salagaev, F. Yu. Salikhov
{"title":"Aeromechanics of the local zone of influence of a gas infrared emitter","authors":"B. V. Borisov,&nbsp;G. V. Kuznetsov,&nbsp;V. I. Maksimov,&nbsp;T. A. Nagornova,&nbsp;S. O. Salagaev,&nbsp;F. Yu. Salikhov","doi":"10.1134/S086986432403003X","DOIUrl":"10.1134/S086986432403003X","url":null,"abstract":"<div><p>Velocity fields and air flow structures have been experimentally established in a local working area with a horizontal panel heated by a gas infrared emitter in the modes of free and mixed (during operation of the air exchange system) convection using the optical SIV (Smoke Image Velocimetry) method. The analysis of the influence of the structure of the air flow, resulting from the heating of surfaces located in the local working area, on the formation of air velocity fields in the operating conditions of a gas infrared emitter was carried out. The extent of the influence of the convection regime on the aeromechanics of the local working area heated by a gas infrared emitter has been established.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"431 - 435"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821433","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
Numerical simulation of a laminar-turbulent flow past a swept wing under the action of a blowing or suction source 在吹力或吸力源作用下流经后掠翼的层流-湍流的数值模拟
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020057
A. V. Boiko, S. V. Kirilovskiy, T. V. Poplavskaya
{"title":"Numerical simulation of a laminar-turbulent flow past a swept wing under the action of a blowing or suction source","authors":"A. V. Boiko,&nbsp;S. V. Kirilovskiy,&nbsp;T. V. Poplavskaya","doi":"10.1134/S0869864324020057","DOIUrl":"10.1134/S0869864324020057","url":null,"abstract":"<div><p>A method and results of computing a laminar-turbulent flow past a swept wing under a control action generated by a source of blowing or suction from the model surface are presented. Pioneering results on the influence of three-dimensional blowing and suction sources on stability of the boundary layer on a swept wing and distributions of <i>N</i>-factors of various mechanisms of the laminar-turbulent transition aimed at changing its position are obtained by using the LOTRAN 3 software package.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"245 - 254"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443325","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
Experimental study of the influence of bubble interaction on their characteristics during transient boiling in a flow of subcooled liquid 过冷液体流中瞬态沸腾时气泡相互作用对其特性影响的实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020100
P. V. Khan, A. A. Levin
{"title":"Experimental study of the influence of bubble interaction on their characteristics during transient boiling in a flow of subcooled liquid","authors":"P. V. Khan,&nbsp;A. A. Levin","doi":"10.1134/S0869864324020100","DOIUrl":"10.1134/S0869864324020100","url":null,"abstract":"<div><p>The paper presents the experimental results on transient nucleate boiling on the heater surface with rapidly increasing surface temperature. According to the results of high-speed video recording with a frequency of 180 000 frames per second and a spatial resolution of 5.5 urn per pixel, the input data for existing models of heat transfer during nucleate boiling must be refined to take into account the existence of cluster and pulsating bubbles. It has been established that bubbles, interacting through the exchange of momentum, heat and vapor mass, accelerate activation of neighboring vaporization sites, so the clusters of bubbles can form at the initial stage of covering the heater surface with vapor. The main characteristics of single, cluster and pulsating bubbles have been studied for the wall superheating from 0 to 14 K above the temperature of nucleation beginning and flow subcooling from 23 to 103 K.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"313 - 319"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443187","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
Increasing the thermal inertia of building walls when using phase change materials 使用相变材料提高建筑墙体的热惯性
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020070
M. I. Nizovtsev, A. N. Sterlyagov
{"title":"Increasing the thermal inertia of building walls when using phase change materials","authors":"M. I. Nizovtsev,&nbsp;A. N. Sterlyagov","doi":"10.1134/S0869864324020070","DOIUrl":"10.1134/S0869864324020070","url":null,"abstract":"<div><p>The influence of a thin layer of phase change material (PCM) on the thermal characteristics of the outer wall of a building made of lightweight thermal insulation material was studied numerically. Changes in temperature and heat flux density were analyzed for various locations of a PCM layer in the wall. It is shown that the use of a thin paraffin layer 4 mm thick in a wall made of foamed polyurethane 100 mm thick can reduce the amplitude of heat flux fluctuations on the inner surface of the wall in the summer from 2 to 13 times, depending on the PCM location. The greatest reduction is achieved when installing the PCM in the central area of the wall. Calculations show that when using a PCM in the walls of buildings made of light thermal insulation materials, a positive effect, associated with a 6–8 hour delay in the maximum heat flux entering the room relative to the maximum daily value of the outside air temperature, is observed in the summer.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"273 - 284"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443193","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
Investigation of the influence of control surfaces and fuselage on the structure of a separated flow around a flying vehicle model with a classical configuration 研究控制面和机身对经典构型飞行器模型周围分离流结构的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020082
A. M. Pavlenko, E. A. Melnik, N. S. Alpatsky, B. Yu. Zanin
{"title":"Investigation of the influence of control surfaces and fuselage on the structure of a separated flow around a flying vehicle model with a classical configuration","authors":"A. M. Pavlenko,&nbsp;E. A. Melnik,&nbsp;N. S. Alpatsky,&nbsp;B. Yu. Zanin","doi":"10.1134/S0869864324020082","DOIUrl":"10.1134/S0869864324020082","url":null,"abstract":"<div><p>The paper describes the results of an experimental study of the influence of control surfaces and fuselage on the structure of a separated flow around a model of a small-size unmanned flying vehicle with a straight leading edge of the wing. The use of oil-soot visualization and hot-wire anemometry shows that the separation region location depends on the attitude of control surfaces, while the presence of a fuselage leads to reduction of the critical angle of attack.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"285 - 300"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443319","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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