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Simulation of Heat and Mass Transfer during Condensation on a Horizontal Half-Tube Placed in a Microporous Medium 微孔介质中水平半管冷凝过程的传热传质模拟
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700158
M. I. Shilyaev, E. M. Khromova
{"title":"Simulation of Heat and Mass Transfer during Condensation on a Horizontal Half-Tube Placed in a Microporous Medium","authors":"M. I. Shilyaev,&nbsp;E. M. Khromova","doi":"10.1134/S1810232825700158","DOIUrl":"10.1134/S1810232825700158","url":null,"abstract":"<p>The paper presents constructed two-layer model of the heat and mass transfer during condensation of saturated vapor on a horizontal half-tube placed in a microporous medium. Analytical solutions for film thickness have been found for conditions of hydrophilicity and hydrophobicity of the microporous medium. It is shown that in case of the effect of capillary forces on heat and mass transfer, these effects are manifested in thinning of the film due to suction for the hydrophilic microporous medium and high film flow velocity along the surface of the half-tube for the hydrophobic medium.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"552 - 566"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420609","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
Evaluation of Passive Cooling Enhancement and Thermal-Hydraulic Characteristics in Distinct Triangular Grooved Ducts Having Fins and TiO2–Water Nanofluid 带翅片的不同三角形沟槽管道和二氧化钛-水纳米流体的被动冷却强化和热工特性评价
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S181023282570002X
Koray Karabulut, Yeliz Alnak
{"title":"Evaluation of Passive Cooling Enhancement and Thermal-Hydraulic Characteristics in Distinct Triangular Grooved Ducts Having Fins and TiO2–Water Nanofluid","authors":"Koray Karabulut,&nbsp;Yeliz Alnak","doi":"10.1134/S181023282570002X","DOIUrl":"10.1134/S181023282570002X","url":null,"abstract":"<p>In this study, transfer of heat and flow peculiarities in triangular grooved finless, double and triple triangular grooved finned channels were searched numerically by comparing them with straight channels. Using the Ansys-Fluent computer program, numerical analysis was performed by solving the conservation equations under steady, two-dimensional and laminar flow conditions. To better direct the flow to the lower surfaces of corrugated channels with constant surface temperature, the fins were positioned between the grooves at the top surface of the duct at angles of 30°, 60°, and 90° (θ) with the horizontal and at different heights of 4, 8, and 12 mm (<i>z</i>). The outcomes of the work were examined as variations in the mean Nu number (Nu<sub>mcorrugated ch.</sub>/Nu<sub>mstraight ch.</sub>), mean surface temperature (<i>T</i><sub>smcorrugated ch.</sub>/<i>T</i><sub>smstraight ch.</sub>) and performance evaluation criteria (PEC), taking into account the effects of fin angles and heights. The study’s findings were checked against both the numerical outcomes and the analytical equation of the work in the literature giving the mean Nu number (Nu<sub>m</sub>), and it was determined that the outcomes were quite compatible and consistent with each other. The outcomes depicted that for Re = 1200, θ = 90°, and <i>z</i> = 12 mm, the (Nu<sub>mcorrugated ch.</sub>/Nu<sub>mstraight ch.</sub>) ratio of TiO<sub>2</sub>–water nanofluid in the triple triangular grooved finned channel is 4.28% higher than in the double triangular grooved finned channel. Furthermore, when the fin height of the triple triangular corrugated channel is reduced from 12 to 4 mm for the Re = 1200 and θ = 90°, the increase in the PEC value for the nanofluid reaches 6.02%.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"625 - 648"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420636","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
Dissociation of SF6 Hydrate with SiO2 Particles at Atmospheric Pressure SF6水合物与SiO2颗粒在常压下的解离
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700080
S. Y. Misyura, V. S. Morozov, A. V. Meleshkin, A. K. Sagidullin, V. A. Knyazkov, V. V. Cheverda, K. I. Andronov, M. A. Stanevko
{"title":"Dissociation of SF6 Hydrate with SiO2 Particles at Atmospheric Pressure","authors":"S. Y. Misyura,&nbsp;V. S. Morozov,&nbsp;A. V. Meleshkin,&nbsp;A. K. Sagidullin,&nbsp;V. A. Knyazkov,&nbsp;V. V. Cheverda,&nbsp;K. I. Andronov,&nbsp;M. A. Stanevko","doi":"10.1134/S1810232825700080","DOIUrl":"10.1134/S1810232825700080","url":null,"abstract":"<p>In contrast to gas hydrate with pure water, the presence of salt in the solution inhibited the synthesis of SF<sub>6</sub> hydrate. The dissociation of an SF<sub>6</sub> hydrate layer with SiO<sub>2</sub> nanoparticles at atmospheric pressure was investigated experimentally. During the dissociation process, there were aggregated SiO<sub>2</sub> particles both inside the layer and on its surface. The SiO<sub>2</sub> particles caused more intense ice melting and water formation. During the ice melting and water film formation, the SiO<sub>2</sub> particles partially clogged pores in the sample layer and reduced the porosity of the layer, which prevented the gas from leaving the hydrate. In contrast to pure gas hydrate, the dissociation of hydrate with SiO<sub>2</sub> particles is accompanied by the formation of large gas bubbles on the surface of the powder layer. The presence of SiO<sub>2</sub> particles leads to an increase in the total dissociation time of SF<sub>6</sub> hydrate by 23–30%.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"613 - 624"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420641","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
Heating and Evaporation of Droplets of Multicomponent Aqueous Suspensions with Solid Insoluble Impurities of Different Thermophysical Properties 含不同热物理性质固体不溶性杂质的多组分水悬浮液液滴的加热和蒸发
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700171
S. A. Kerimbekova, G. V. Kuznetsov, M. S. Shahray, P. A. Strizhak
{"title":"Heating and Evaporation of Droplets of Multicomponent Aqueous Suspensions with Solid Insoluble Impurities of Different Thermophysical Properties","authors":"S. A. Kerimbekova,&nbsp;G. V. Kuznetsov,&nbsp;M. S. Shahray,&nbsp;P. A. Strizhak","doi":"10.1134/S1810232825700171","DOIUrl":"10.1134/S1810232825700171","url":null,"abstract":"<p>Studies of heating and evaporation of heterogeneous suspension droplets in a high-temperature gas environment, the parameters of which match the conditions in thermal water treatment chambers, form the basis for developing methods to improve the efficiency of these technologies. Using high-speed video recording, we investigated experimentally the heating and evaporation characteristics of multicomponent suspension droplets in a gaseous medium within a temperature range of 330–670 K. The effect of the most significant factors—type and concentration of impurities, and heat flux density—on the heating and evaporation characteristics of suspension droplets has been determined. The experiments revealed dependences of droplet heating and evaporation rates on variations in the external gas environment parameters. Based on these results, we proposed recommendations for applying the experimental findings to advance technologies for the thermal purification of wastewater and process water from solid, insoluble impurities.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"525 - 540"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420606","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 Inclination Angle on Heat Transfer in Upward Bubbly Flow in a Pipe 倾斜角度对管内向上气泡流动换热的影响
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700079
O. N. Kashinsky, L. S. Timkin, A. S. Kurdyumov
{"title":"Effect of Inclination Angle on Heat Transfer in Upward Bubbly Flow in a Pipe","authors":"O. N. Kashinsky,&nbsp;L. S. Timkin,&nbsp;A. S. Kurdyumov","doi":"10.1134/S1810232825700079","DOIUrl":"10.1134/S1810232825700079","url":null,"abstract":"<p>Experimental study on heat transfer in bubbly flow in an inclined pipe was performed. The angle of pipe inclination varied from 12° to 80° relative to horizontal. Experiments were performed for two values of superficial liquid velocity. It was shown that the highest values of heat transfer correspond to intermediate angles of inclination. The addition of gas phase results in a significant increase of heat transfer even at low gas flow rates. Results obtained are qualitative similar to those obtained in an inclined rectangular channel. However, the quantitative data are different due to different geometry of the inner wall of the channel.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"519 - 524"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420639","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 Weak Far-Field Shock Waves with Local Heat Flow Heating near Body in Spatial Configuration 空间构型中近体局部热流加热的弱远场激波动力学
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700122
A. V. Potapkin, D. Yu. Moskvichev
{"title":"Dynamics of Weak Far-Field Shock Waves with Local Heat Flow Heating near Body in Spatial Configuration","authors":"A. V. Potapkin,&nbsp;D. Yu. Moskvichev","doi":"10.1134/S1810232825700122","DOIUrl":"10.1134/S1810232825700122","url":null,"abstract":"<p>This work investigated numerically the dynamics of weak far-field shock waves and the possibility of reducing the intensity of shock waves from a body in a spatial configuration through local heating of the incoming supersonic flow near the body. The body was a pointed thin body of revolution, in front of which an aerodynamic surface in the form of a thin disk was located at an angle to the incoming flow. The Mach number of the incoming air flow was 2. The calculations were performed using the combined “phantom body” method. It has been shown that local heating of the incoming flow near the body ensures a decrease in the intensity of the far-field shock waves.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"541 - 551"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420608","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
Nanosecond Laser Microtexturing of Silicon: Morphology and Wetting Properties 硅的纳秒激光微织构：形貌和润湿性能
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700146
M. M. Vasilev, A. A. Rodionov, T. Giannakis, M. Kandyla, V. V. Terekhov, S. V. Starinskiy
{"title":"Nanosecond Laser Microtexturing of Silicon: Morphology and Wetting Properties","authors":"M. M. Vasilev,&nbsp;A. A. Rodionov,&nbsp;T. Giannakis,&nbsp;M. Kandyla,&nbsp;V. V. Terekhov,&nbsp;S. V. Starinskiy","doi":"10.1134/S1810232825700146","DOIUrl":"10.1134/S1810232825700146","url":null,"abstract":"<p>This work presents a nanosecond pulsed laser treatment of silicon surfaces aimed at creating superhydrophilic structures. As a result, two types of surfaces were formed: GraySi and BlackSi, which differ in micromorphology and exhibit superhydrophilic properties. Additional modification of the BlackSi surface by zinc oxide (ZnO) deposition allowed for the formation of a uniform nanostructured layer, leading to a significant improvement of the material’s wicking capability. A quantitative evaluation of the wicking capability of the structures was carried out based on the Wi number, which was 1.9 for GraySi, 2.3 for BlackSi, and 3.6 for BlackSi+ZnO.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"480 - 486"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420635","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
Optimal Experiment Design to Estimate the Parameters of Thermal Destruction of Materials 材料热破坏参数的优化实验设计
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700109
A. V. Nenarokomov, A. V. Morzhukhina, D. M. Titov, E. V. Shakhmatov
{"title":"Optimal Experiment Design to Estimate the Parameters of Thermal Destruction of Materials","authors":"A. V. Nenarokomov,&nbsp;A. V. Morzhukhina,&nbsp;D. M. Titov,&nbsp;E. V. Shakhmatov","doi":"10.1134/S1810232825700109","DOIUrl":"10.1134/S1810232825700109","url":null,"abstract":"<p>This paper presents results on mathematical modeling with respect to a simultaneous evaluating of the emissivity and thermal effect of sublimation for carbon composites material as functions of temperature. Optimal experiment design based on influence of the external heat fluxes and some other parameters to the accuracy of the considered inverse problems solution has been studied.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"649 - 660"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420603","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
Simulation of a Dispersed Phase Scattering in a Turbulent Droplet-Laden Flow with Peripheral Swirling: Eulerian and Lagrangian Approaches 具有外围旋流的液滴湍流中分散相散射的模拟：欧拉和拉格朗日方法
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700110
M. A. Pakhomov, V. I. Terekhov
{"title":"Simulation of a Dispersed Phase Scattering in a Turbulent Droplet-Laden Flow with Peripheral Swirling: Eulerian and Lagrangian Approaches","authors":"M. A. Pakhomov,&nbsp;V. I. Terekhov","doi":"10.1134/S1810232825700110","DOIUrl":"10.1134/S1810232825700110","url":null,"abstract":"<p>Numerical simulation of a dispersed phase scattering in a turbulent droplet-laden flow in a cylindrical channel with a peripheral swirling has been performed with variations in the initial weight concentration of water droplets within the range <i>M</i><sub><i>L</i>1</sub> = 0−0.1 and the initial droplet diameter <i>d</i><sub>1</sub> = 10–100 µm using Eulerian and Lagrangian descriptions. The gas phase is described by a system of three-dimensional URANS equations, taking into account the effect of particles on transport processes in the carrier phase. The turbulence of the gas phase is calculated using the elliptical Reynolds stress transfer model, taking into account the effect of the dispersed phase. The Eulerian and Lagrangian descriptions give qualitatively similar computation results for the mass concentration profiles of droplets over the entire studied range of their initial diameters and concentrations (the difference in the computation results does not exceed 20%) and the position of the local concentration maximum. Comparisons have been made with the data of LES computations and measurements of the swirling droplet-laden flow at the swirl number <i>S</i> = 0.7, for which the precession of the vortex core occurs.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"499 - 510"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420605","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
Features of Diagnostics of Droplet Phase in Gas–Droplet Flow behind a Supersonic Nozzle during Outflow into a Vacuum 超声速喷嘴后气滴向真空流出过程中液滴相诊断特征
IF 1.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S181023282570016X
V. N. Yarygin, I. V. Yarygin, V. G. Prikhodko
{"title":"Features of Diagnostics of Droplet Phase in Gas–Droplet Flow behind a Supersonic Nozzle during Outflow into a Vacuum","authors":"V. N. Yarygin,&nbsp;I. V. Yarygin,&nbsp;V. G. Prikhodko","doi":"10.1134/S181023282570016X","DOIUrl":"10.1134/S181023282570016X","url":null,"abstract":"<p>This paper develops methods for diagnostics of the droplet phase in gas–droplet flows under conditions of fast droplet evaporation, including the functions of droplet distribution by size, direction, and velocity. Measurements were made for the spatial distribution of the droplet phase in a gas–droplet flow formed during a jet outflow of the wall liquid film with a cocurrent gas flow into a vacuum from a supersonic conical nozzle with the Mach number M = 2.75. The features of the behavior of the liquid film on the outlet edge of the nozzle, the ultimate cooling temperature of the liquid, and disintegration of the film into droplets with the formation of back flows are discussed.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"465 - 472"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420637","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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