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NUMERICAL SIMULATION OF DROPLET EVAPORATION EFFECT ON LOCAL HEAT EXCHANGE IN A TURBULENT FLOW BEHIND AN OBSTACLE
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S0021894424040096
M. A. Pakhomov
{"title":"NUMERICAL SIMULATION OF DROPLET EVAPORATION EFFECT ON LOCAL HEAT EXCHANGE IN A TURBULENT FLOW BEHIND AN OBSTACLE","authors":"M. A. Pakhomov","doi":"10.1134/S0021894424040096","DOIUrl":"10.1134/S0021894424040096","url":null,"abstract":"<p>This paper describes a numerical study of heat exchange in a droplet-laden turbulent flow behind a single square obstacle with variation in initial mass concentration and in dispersed phase particle diameter. In the case of a flow past an obstacle, adding droplets to the flow significantly intensifies the heat exchange (almost twofold) as compared to a single-phase air flow. It is shown that, when a two-phase flow flows past a transverse obstacle, there is an approximately 12% difference between the coordinates of the maximum heat exchange intensity and those at the flow attachment point. An increase in obstacle height leads to a decrease in heat exchange intensity.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"665 - 676"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430904","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
SPIRAL HIGH-VOLTAGE PULSE GENERATOR WITH SPATIALLY SEPARATED INDUCTIVE AND CAPACITIVE PARTS
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S0021894424040023
E. I. Palchikov, A. M. Ryabchun, A. G. Paraskun
{"title":"SPIRAL HIGH-VOLTAGE PULSE GENERATOR WITH SPATIALLY SEPARATED INDUCTIVE AND CAPACITIVE PARTS","authors":"E. I. Palchikov,&nbsp;A. M. Ryabchun,&nbsp;A. G. Paraskun","doi":"10.1134/S0021894424040023","DOIUrl":"10.1134/S0021894424040023","url":null,"abstract":"<p>New modifications of spiral generators with meander striplines have been proposed in which the inductive and capacitive parts of the generator to be separated in space. The proposed modification allows separate regulation of the wave impedance of the double-bus spiral stripline and the generator winding inductance and capacitance. The characteristics of the generators have been studied experimentally, and theoretical models adequately describing the operation of these devices have been proposed. The developed generators can be used to produce pulsed X-ray apparatuses with explosive electron emission.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"602 - 608"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431038","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 SPANWISE-UNIFORM STREAKS ON SWEPT-WING BOUNDARY LAYER WITH ENHANCED FREE-STREAM VORTICITY
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S0021894424040114
V. I. Borodulin, A. V. Ivanov, Y. S. Kachanov
{"title":"EFFECT OF SPANWISE-UNIFORM STREAKS ON SWEPT-WING BOUNDARY LAYER WITH ENHANCED FREE-STREAM VORTICITY","authors":"V. I. Borodulin,&nbsp;A. V. Ivanov,&nbsp;Y. S. Kachanov","doi":"10.1134/S0021894424040114","DOIUrl":"10.1134/S0021894424040114","url":null,"abstract":"<p>The influence of spanwise-uniform roughness elements (streaks) on the laminar–turbulent transition in the boundary layer on a swept wing with predominance of crossflow instability in the presence of unsteady and steady free-stream vortices is studied. The measurements are performed for rectangular (in the plane parallel to the flow and normal to the wall) roughness elements shaped as streaks of different heights, which have two different widths in the chordwise direction. The experiments are performed in a low-turbulence wind tunnel at low subsonic velocities of the incident flow with the use of hot-wire anemometry. The studies are conducted in the range of unit Reynolds numbers (based on the streamwise component of velocity at the boundary layer edge at the beginning of the rough surface region) from <span>(0.687cdot 10^6)</span> to <span>(1.568cdot 10^{6})</span> 1/m. The results are obtained in 76 regimes of measurements for two types of free-stream vortex disturbances induced by two turbulence-generating grids: with predominance of unsteady disturbances and combination of steady and unsteady disturbances.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"688 - 713"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430777","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 CHARACTERISTICS OF PLATE-FIN HEAT SINKS ENHANCED BY PIEZOELECTRIC FANS
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S0021894424040138
H. P. Hsu, P. T. Wu, H. Ay
{"title":"HEAT TRANSFER CHARACTERISTICS OF PLATE-FIN HEAT SINKS ENHANCED BY PIEZOELECTRIC FANS","authors":"H. P. Hsu,&nbsp;P. T. Wu,&nbsp;H. Ay","doi":"10.1134/S0021894424040138","DOIUrl":"10.1134/S0021894424040138","url":null,"abstract":"<p>In this study, the thermal and fluid flow characteristics of a piezoelectric fan are experimentally evaluated by altering its height and distance from single-fin and plate-fin heat sinks. Based on the thermal resistance of heat sinks, the piezoelectric fan performance is assessed. Particle image velocimetry is used to study the flow velocity field generated by the piezoelectric fan.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"725 - 735"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430779","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
OPTIMIZATION OF DESIGN PARAMETERS FOR A FIBER-WOUND PRESSURE VESSEL WITH A STABLE STRENGTH RATIO BASED ON THE HYBRID METHOD OF PARTICLE SWARM OPTIMIZATION AND GREY WOLF OPTIMIZATION
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S002189442404014X
Zan Liu, Meijing Zhong, Shuang Ye, Chunjin Li, Chao Kang, Bo Deng
{"title":"OPTIMIZATION OF DESIGN PARAMETERS FOR A FIBER-WOUND PRESSURE VESSEL WITH A STABLE STRENGTH RATIO BASED ON THE HYBRID METHOD OF PARTICLE SWARM OPTIMIZATION AND GREY WOLF OPTIMIZATION","authors":"Zan Liu,&nbsp;Meijing Zhong,&nbsp;Shuang Ye,&nbsp;Chunjin Li,&nbsp;Chao Kang,&nbsp;Bo Deng","doi":"10.1134/S002189442404014X","DOIUrl":"10.1134/S002189442404014X","url":null,"abstract":"<p>This study is aimed at optimizing the design parameters (winding angle, fiber volume fraction, elasticity modulus of fibers, and radius-thickness ratio) of the fiber-wound pressure vessel for achieving a stable strength ratio based on a hybrid method of Particle Swarm Optimization and Grey Wolf Optimization (HPSOGWO). A three-dimensional linear elasticity theory is used to solve the problem numerically.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"736 - 748"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430780","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
REFLECTION OF ACOUSTIC WAVES IN BUBBLE CURTAIN WATER CONTAINING HYDRATE BUBBLES
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S0021894424040072
I. K. Gimaltdinov, I. G. Khusainov
{"title":"REFLECTION OF ACOUSTIC WAVES IN BUBBLE CURTAIN WATER CONTAINING HYDRATE BUBBLES","authors":"I. K. Gimaltdinov,&nbsp;I. G. Khusainov","doi":"10.1134/S0021894424040072","DOIUrl":"10.1134/S0021894424040072","url":null,"abstract":"<p>The dynamics of an acoustic signal passing through a bubble curtain has been studied by mathematical modeling. The case is considered where the gas (methane) in the bubbles is under hydrate formation conditions. The effects of the hydrate formation process, the initial bubble radius, and the volume gas fraction on the attenuation coefficient and phase velocity of the wave propagating in a deep-water bubble curtain are investigated. The reflection and transmission coefficients of acoustic waves at the boundaries separating single- and two-phase regions are obtained. It is found that the hydrate formation process increases the wave attenuation coefficient by more than two orders of magnitude at low frequencies (below 1 kHz).</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"638 - 646"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430900","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
DIFFUSION WAVE INITIATION PROBLEM FOR A NONLINEAR PARABOLIC SYSTEM IN THE CASES OF SPHERICAL AND CYLINDRICAL SYMMETRY
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S0021894424040102
A. L. Kazakov, L. F. Spevak
{"title":"DIFFUSION WAVE INITIATION PROBLEM FOR A NONLINEAR PARABOLIC SYSTEM IN THE CASES OF SPHERICAL AND CYLINDRICAL SYMMETRY","authors":"A. L. Kazakov,&nbsp;L. F. Spevak","doi":"10.1134/S0021894424040102","DOIUrl":"10.1134/S0021894424040102","url":null,"abstract":"<p>Solutions having the form of a diffusion wave propagating in a medium at rest with a finite velocity to a nonlinear parabolic reaction–diffusion system are constructed and studied. A problem of initiating a diffusion wave by boundary conditions specified on a sphere (circular cylindrical surface) is considered in the cases of spherical and cylindrical symmetry for the first time. An existence and uniqueness theorem for a solution in the class of analytical functions is proven. An exact solution is constructed in the form of explicit formulas. A step-by-step iterative algorithm based on the collocation method and expansion in radial basis functions is proposed. Numerical calculations are performed, and their results are verified using the exact solution.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"677 - 687"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430719","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 LAMINAR–TURBULENT TRANSITION WITH THE USE OF A HOT-WIRE FILM SENSOR
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-02-17 DOI: 10.1134/S0021894424040060
D. A. Bountin, O. I. Vishnyakov, P. A. Polivanov
{"title":"INVESTIGATION OF THE LAMINAR–TURBULENT TRANSITION WITH THE USE OF A HOT-WIRE FILM SENSOR","authors":"D. A. Bountin,&nbsp;O. I. Vishnyakov,&nbsp;P. A. Polivanov","doi":"10.1134/S0021894424040060","DOIUrl":"10.1134/S0021894424040060","url":null,"abstract":"<p>The laminar–turbulent transition in transonic flows is studied with the use of hot-wire thin-film surface sensors. For determining fluctuations recorded by the film sensor in the boundary layer, coherence spectra are constructed between the data obtained by the film sensor and by the hot-wire probe, which was used to perform measurements across the entire boundary layer. Based on the analysis of these spectra, it is demonstrated that the most accurate and complete data are obtained by the thin-film sensor in the intermittency region.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 4","pages":"629 - 637"},"PeriodicalIF":0.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431042","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
WAVES AT THE INTERFACE WITH COUNTERCURRENT FLOW OF A THIN LIQUID FILM AND TURBULENT GAS IN A NARROW VERTICAL CHANNEL 在一个狭窄的垂直通道中，液体薄膜与湍流气体的逆流界面处的波
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030039
O. Yu. Tsvelodub
{"title":"WAVES AT THE INTERFACE WITH COUNTERCURRENT FLOW OF A THIN LIQUID FILM AND TURBULENT GAS IN A NARROW VERTICAL CHANNEL","authors":"O. Yu. Tsvelodub","doi":"10.1134/S0021894424030039","DOIUrl":"10.1134/S0021894424030039","url":null,"abstract":"<p>A countercurrent flow of a liquid film and a turbulent gas in a narrow vertical channel is considered. In the case of small Reynolds numbers and under certain conditions of the flow parameters, the problem is reduced to studying one evolutionary integrodifferential equation for the deviation of film thickness from an unperturbed level. Evolution of periodic disturbances is numerically studied. Several solutions to the model equation are presented.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"414 - 426"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798390","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
EQUILIBRIUM MODEL OF THE MIXING LAYER IN SHEAR FLOW OF A STRATIFIED FLUID 分层流体剪切流动中混合层的平衡模型
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030040
V. Yu. Liapidevskii, A. A. Chesnokov
{"title":"EQUILIBRIUM MODEL OF THE MIXING LAYER IN SHEAR FLOW OF A STRATIFIED FLUID","authors":"V. Yu. Liapidevskii,&nbsp;A. A. Chesnokov","doi":"10.1134/S0021894424030040","DOIUrl":"10.1134/S0021894424030040","url":null,"abstract":"<p>A mathematical model is proposed that describes the formation of internal hydraulic jumps and the mixing of codirectional flows of an ideal stratified fluid in the Boussinesq approximation. The model is based on a three-layer representation of the flow taking into account the entrainment of fluid from the outer layers into the intermediate vortex layer and is represented as a system of inhomogeneous conservation laws. The rate of entrainment is given by the equilibrium condition within the framework of a more general model for the evolution of the mixing layer. The velocity of propagation of disturbances and the concepts of subcritical and supercritical flows are formulated. It is shown that the model is suitable for describing flow mixing and splitting in deep-sea currents. Solutions were constructed that correspond to the flow around an obstacle with the formation of an internal hydraulic jump and a region of intense mixing. The results of numerical simulation were shown to be in good agreement with experimental data.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"427 - 438"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798246","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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