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Effect of a small concentration of surfactant on gas bubble sizes for a flow in an inclined channel 小浓度表面活性剂对倾斜通道流动中气泡大小的影响
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-11-24 DOI: 10.1134/S0869864325010172
A. O. Karhov, A. E. Gorelikova, M. A. Vorobyev
{"title":"Effect of a small concentration of surfactant on gas bubble sizes for a flow in an inclined channel","authors":"A. O. Karhov,&nbsp;A. E. Gorelikova,&nbsp;M. A. Vorobyev","doi":"10.1134/S0869864325010172","DOIUrl":"10.1134/S0869864325010172","url":null,"abstract":"<div><p>The experimental study was performed on the influence of surfactants on the bubble size distribution for a bubbly flow in an inclined tube. Measurements were performed for a round tube with the inner diameter of 32 mm at the gas flow rate 3.3, 5, and 8 ml/min and the tube inclination angles 30–60°. Diameters of gas bubbles and mean diameters were measured from the shadow images of bubbly flow. These parameters were recorded as a function of the tube inclination angle and the distance from gas injection site and the measuring zone. Adding of surfactants reduces the bubble detachment diameter and suppresses bubble coalescence.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 1","pages":"161 - 169"},"PeriodicalIF":0.6,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145580600","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 air-blown biomass gasification in a pilot setup 生物质气吹气化中试装置的研究
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-11-24 DOI: 10.1134/S0869864325010184
A. D. Nikitin, N. A. Abaimov, M. I. Ershov, V. G. Tuponogov, L. V. Simbiryatin, A. F. Ryzhkov, S. V. Alekseenko
{"title":"Investigation of air-blown biomass gasification in a pilot setup","authors":"A. D. Nikitin,&nbsp;N. A. Abaimov,&nbsp;M. I. Ershov,&nbsp;V. G. Tuponogov,&nbsp;L. V. Simbiryatin,&nbsp;A. F. Ryzhkov,&nbsp;S. V. Alekseenko","doi":"10.1134/S0869864325010184","DOIUrl":"10.1134/S0869864325010184","url":null,"abstract":"<div><p>The paper presents results of experiments on low-temperature entrained-flow gasification of raw biomass with a broad fractional composition in a pilot setup under atmospheric pressure with a diverging duct and upflow. Here the fuel source is a wet pine-tree sawdust with the mean size 0.25–0.50 mm and the maximum size of 5–6 mm. The gasifier parameters: air flow rate is 8–15 m<sup>3</sup>/h, solid fuel rate is in the range 7.3–19.5 kg/h. The produced syngas has the heating value is the range 2.47–5.58 MJ/m<sup>3</sup> and this fits the technical requirements for fuel gases used in internal combustion engines and in gas turbine plants.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 1","pages":"171 - 178"},"PeriodicalIF":0.6,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145580614","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
Multiple-relaxation-time lattice Boltzmann analysis of the flow and temperature structures in a ventilated cavity: impact of inlet fresh fluid jet 通风腔内流动和温度结构的多松弛时间晶格玻尔兹曼分析：进口新鲜流体射流的影响
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-11-24 DOI: 10.1134/S086986432501024X
Y. Abdellouche, M. Belmedani, N. Himrane, D. E. Ameziani
{"title":"Multiple-relaxation-time lattice Boltzmann analysis of the flow and temperature structures in a ventilated cavity: impact of inlet fresh fluid jet","authors":"Y. Abdellouche,&nbsp;M. Belmedani,&nbsp;N. Himrane,&nbsp;D. E. Ameziani","doi":"10.1134/S086986432501024X","DOIUrl":"10.1134/S086986432501024X","url":null,"abstract":"<div><p>This paper presents a summary of a numerical study of mixed convection in a two-dimensional ventilated square cavity; it discusses the impact of the fresh inlet fluid jet on the flow and temperature structures. A saturated porous partition of thickness <i>E</i><sub>p</sub> = <i>H</i>/5 is positioned at the center of the cavity bottom with a height <i>H</i><sub>p</sub> between <i>H</i>/5 and <i>H</i>, while the vertical walls are kept adiabatic and impervious, the bottom horizontal wall is subject to a vertical thermal gradient. The momentum conservation equation uses the Darcy model with an energy equation, including the Brinkman extension, the multi-relaxation time collision factor based lattice Boltzmann method is used to solve the set of coupled equations. The numerical results present and discuss flow patterns and thermal field structures, reveal important physical quantities, such as the local and mean Nusselt value on the bottom wall. The parametric study presents the effects of Reynolds and Rayleigh numbers with respect to a given Darcy number and porous wall height. For a high Darcy number, the porous medium increases the surface of action of the cold fluid. In addition, by increasing the height of the porous wall, the thermal draft (Ra) has little influence on the Nusselt values.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 1","pages":"245 - 266"},"PeriodicalIF":0.6,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145580619","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
Optimized thermodynamic cycle design of low infrared turbofan engine with central cone film cooling system 采用中央锥膜冷却系统的低红外涡扇发动机热力循环优化设计
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-11-24 DOI: 10.1134/S0869864325010238
M. Chen, H. Zhang
{"title":"Optimized thermodynamic cycle design of low infrared turbofan engine with central cone film cooling system","authors":"M. Chen,&nbsp;H. Zhang","doi":"10.1134/S0869864325010238","DOIUrl":"10.1134/S0869864325010238","url":null,"abstract":"<div><p>An innovative method for rapid calculation of engine infrared signatures was proposed and integrated into the component-level model. Subsequently, the multiple-objective particle swarm optimization algorithm was utilized to optimize the infrared characteristics and fuel economy under the constraint of constant thrust during high-altitude penetration state. According to the Pareto solution sets, the exhaust system’s infrared radiation intensity decreased by 6 % to 23 % compared with the baseline engine while keeping the fuel consumption rate unchanged. When designing thermodynamic cycle parameters, a higher pressure ratio is beneficial for reducing infrared characteristics. The combination of high bypass ratio and high turbine inlet total temperature would strike a compromise between fuel economy and low infrared performance. Reducing the bypass ratio and turbine inlet total temperature while decreasing the nozzle throat area would further decrease the infrared radiation intensity of the exhaust system, but also lead to an increase in infrared radiation from jet flow, while enlarging the nozzle throat area would have the opposite effect. These findings have important implications for the development of more efficient designs and contribute to the advancement of thermal management.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 1","pages":"225 - 244"},"PeriodicalIF":0.6,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145580597","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 for excitation of streamwise structures in a supersonic boundary layer with diffusion combustion 具有扩散燃烧的超声速边界层中流向结构的激励模拟
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-11-24 DOI: 10.1134/S0869864325010159
S. A. Gaponov
{"title":"Modeling for excitation of streamwise structures in a supersonic boundary layer with diffusion combustion","authors":"S. A. Gaponov","doi":"10.1134/S0869864325010159","DOIUrl":"10.1134/S0869864325010159","url":null,"abstract":"<div><p>A modeling study was performed for excitation of streamwise structures in a boundary layer with combustion. Modeling for undisturbed flow in a boundary layer is based on locally self-similar solutions for a boundary layer flow; these solutions account for streamwise pressure gradients and a heat source in the boundary layer with combustion that comply to simulated data. This undisturbed flow solution is a basis for solving a problem of interacting the external vorticity with a boundary layer (for the case of hydrogen-air combustion). We demonstrated that this type of interaction with the boundary layer generates intensive streamwise structure with velocity inhomogeneity in the lateral direction. These structures have the level of velocity higher than for the external vorticity velocity by factor of tens. Meanwhile, a maximum value of temperature inhomogeneity is much higher than for the velocity maldistribution.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 1","pages":"145 - 154"},"PeriodicalIF":0.6,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145580599","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 and performance testing of the cooling serpentine minichannels and proposed correlations 冷却蛇形小通道的实验研究、性能测试及相关建议
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-11-24 DOI: 10.1134/S0869864325010214
M. Marzougui, L. Boutas, S. Gannouni, R. Chargui, J. Zinoubi
{"title":"Experimental study and performance testing of the cooling serpentine minichannels and proposed correlations","authors":"M. Marzougui,&nbsp;L. Boutas,&nbsp;S. Gannouni,&nbsp;R. Chargui,&nbsp;J. Zinoubi","doi":"10.1134/S0869864325010214","DOIUrl":"10.1134/S0869864325010214","url":null,"abstract":"<div><p>The current research conducted experimental inquiries into convective heat transfer of different serpentine minichannel heat exchangers used to cool an electronic component. The working fluid used in all the experiments aimed at both minichannels was deionized water. The experimental investigation reported the thermal performance of the cooling minichannels, introducing the effect of several operating parameters. The findings revealed that the heat transfer enhancement achieved with the 2-mm long cooling serpentine minichannel exceeded that of the 3-mm long cooling minichannel; however, the overall thermal resistance derived from the heat exchanger with five minichannels was also greater than that obtained from the ten serpentine minichannels. In addition, at the same imposed volume flow rate used in these experimental investigations, the average convective heat transfer rate estimated from the 2-mm heat sink was 2.5 times greater than that obtained from the 3-mm heat sink. Furthermore, the utilization of U-shaped serpentine minichannel heat exchangers underscores their significance as a crucial element in efficiently cooling electronic components, particularly at low flow rates. Based on the experimental data, distinct correlations emerge among temperature differentials, overall thermal resistance, and average heat transfer coefficients.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 1","pages":"191 - 206"},"PeriodicalIF":0.6,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145580617","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
Sea spray at extremely high wind speeds: generation mechanisms, contribution to atmosphere–ocean interactions, and role in sea hurricane dynamics 极高风速下的浪花：产生机制，对大气-海洋相互作用的贡献，以及在海上飓风动力学中的作用
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-25 DOI: 10.1134/S0869864324060155
Yu. I. Troitskaya, D. A. Sergeev, O. S. Ermakova, A. N. Zotova, M. I. Vdovin
{"title":"Sea spray at extremely high wind speeds: generation mechanisms, contribution to atmosphere–ocean interactions, and role in sea hurricane dynamics","authors":"Yu. I. Troitskaya,&nbsp;D. A. Sergeev,&nbsp;O. S. Ermakova,&nbsp;A. N. Zotova,&nbsp;M. I. Vdovin","doi":"10.1134/S0869864324060155","DOIUrl":"10.1134/S0869864324060155","url":null,"abstract":"<div><p>The presented research has made progress in describing sea spray and understanding the associated processes in terms of its physical properties, as well as the resulting fluxes from the ocean to the atmosphere, its influence on the development of ocean storms, and related problems and issues. The main results were obtained during laboratory experiments on wind-wave flumes using high-speed photography. Descriptions of studies related to the identification of the dominant type of spray generation (the bag-breakup type) and the statistics of these phenomena in a wide range of conditions depending on the wind-wave Reynolds number characterizing small-scale processes are given. Convolution of this statistics with the droplet size distribution from a single phenomenon of spray generation of the specified type, obtained from data of a special experiment, yields the spray generation function.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 6","pages":"1245 - 1250"},"PeriodicalIF":0.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145172","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
Linear thermal expansion coefficient of monocrystalline silicon 单晶硅的线性热膨胀系数
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-25 DOI: 10.1134/S0869864324060210
Yu. M. Kozlovskii, S. V. Stankus
{"title":"Linear thermal expansion coefficient of monocrystalline silicon","authors":"Yu. M. Kozlovskii,&nbsp;S. V. Stankus","doi":"10.1134/S0869864324060210","DOIUrl":"10.1134/S0869864324060210","url":null,"abstract":"<div><p>The paper presents the results of dilatometric measurements for thermal expansion of monocrystalline silicon for the temperature range of 100 – 1373 K. The temperature dependencies for thermal properties of material are calculated. The look-up tables for a wide temperature range for a solid state are calculated.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 6","pages":"1289 - 1292"},"PeriodicalIF":0.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144829","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
Method for simplified CFD simulation for pressure swirl nozzle atomization 压力旋流喷嘴雾化的简化CFD模拟方法
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-25 DOI: 10.1134/S0869864324060064
Ar. A. Dekterev, A. A. Dekterev
{"title":"Method for simplified CFD simulation for pressure swirl nozzle atomization","authors":"Ar. A. Dekterev,&nbsp;A. A. Dekterev","doi":"10.1134/S0869864324060064","DOIUrl":"10.1134/S0869864324060064","url":null,"abstract":"<div><p>A simple CFD modeling method is presented which is adapted for a problem of liquid atomization by a pressure swirl nozzle. The method is based on the VOF method and several assumptions; this approach enables calculating the spray characteristics during a reasonable computation time. The primary testing results confirmed the possibility of using this simulation method.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 6","pages":"1171 - 1176"},"PeriodicalIF":0.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145169","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
Analytical equation of state for liquid and gaseous nitrogen 液态氮和气态氮的状态解析方程
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2025-07-25 DOI: 10.1134/S0869864324060167
R. Kh. Bolotnova, E. F. Gainullina, E. A. Faizullina
{"title":"Analytical equation of state for liquid and gaseous nitrogen","authors":"R. Kh. Bolotnova,&nbsp;E. F. Gainullina,&nbsp;E. A. Faizullina","doi":"10.1134/S0869864324060167","DOIUrl":"10.1134/S0869864324060167","url":null,"abstract":"<div><p>Based on the previously developed method for constructing the equation of state (EOS) for liquid and vapor, the thermodynamically consistent analytical equation of state for liquid and gaseous nitrogen (in the molecular phase) is obtained. While constructing the equation of state, the Mie – Gruneisen form was used as a sum of potential and thermal components for pressure and internal energy. The potential components are described by a potential of the Born–Meyer type. For the thermal components, a simplifying approximation is adopted that follows from the condition for the constant average heat capacity and the dependence of Gruneisen function on the volume. When deriving the equation of state for nitrogen vapor and liquid phases, the tables calculated from equations approximating experimental data on isothermal compressibility, adiabatic speed of sound (including the critical region and phase equilibrium line) were used. The obtained equation of state for nitrogen can be useful in studying the phenomena associated with the processes of nitrogen evaporation and condensation in multiphase flows. This modeling takes into account the interfacial heat and mass transfer under conditions of low pressures and cryogenic temperatures.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 6","pages":"1251 - 1258"},"PeriodicalIF":0.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145173","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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