Fluid Dynamics最新文献_第3页

Experimental Study of the Dynamic Behavior of Droplet Impact on Horizontal Cylindrical Surfaces 液滴撞击水平圆柱表面动力学行为的实验研究

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-06-28 DOI: 10.1134/S0015462826600124

Y. J. Xu, Z. H. Wan, G. Q. Wu, J. C. Zeng, X. F. Yin, Z. B. Zhang, Z. Y. Zhou, L. J. Guo

{"title":"Experimental Study of the Dynamic Behavior of Droplet Impact on Horizontal Cylindrical Surfaces","authors":"Y. J. Xu, Z. H. Wan, G. Q. Wu, J. C. Zeng, X. F. Yin, Z. B. Zhang, Z. Y. Zhou, L. J. Guo","doi":"10.1134/S0015462826600124","DOIUrl":"10.1134/S0015462826600124","url":null,"abstract":"High-speed imaging is used to investigate droplet impact dynamics on cylindrical surfaces, focusing on the effects of the impact height H, the initial diameter D0, and the wall roughness Ra on circumferential spreading. The results show the following: as H increases from 19 to 79 mm, the maximum circumferential spreading length increases by 39.02% on the inner surface and by 57.88% on the outer surface, the outer surface consistently exhibiting larger spreading due to convex geometry promoting circumferential flow. An increase in D0 from 2.11 to 3.34 mm enhances the maximum spreading length by 82.94% on the inner surface, while the spreading factor increases by 21.05% only, revealing a nonlinear dependence of the spreading factor on the droplet diameter. In contrast, wall roughness has a negligible effect within the tested range, suggesting inertia-dominated spreading. At higher impact conditions, finger-like splashing occurs, with a lower critical Weber number on the outer surface, attributed to enhanced air entrainment over convex geometries. In addition, droplet coalescence leads to prolonged oscillation and delayed stabilization on the outer surface, highlighting the role of curvature in energy dissipation. Correlations between the maximum spreading factor and the Weber number are established for predictive purposes. These findings provide insight into the droplet behavior on curved surfaces relevant to spray cooling and anti-icing applications.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323672","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 Spreading and Freezing during Sequential Droplet Impacts on an Inclined Ice Surface 倾斜冰面上液滴连续撞击过程中扩散和冻结的研究

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-06-28 DOI: 10.1134/S0015462826600136

Y. Liu, D. Wang, J. Wang, Z. Liu, J. Wang, Y. Shang, D. Li

{"title":"Investigation of Spreading and Freezing during Sequential Droplet Impacts on an Inclined Ice Surface","authors":"Y. Liu, D. Wang, J. Wang, Z. Liu, J. Wang, Y. Shang, D. Li","doi":"10.1134/S0015462826600136","DOIUrl":"10.1134/S0015462826600136","url":null,"abstract":"The impact and subsequent freezing of droplets on cold surfaces are critical phenomena in the aerospace, energy, and power industries, often compromising equipment integrity and operational performance. While dingle-droplet impacts have been extensively studied, systematic investigations into the sequential impact of multiple droplets—a more representative scenario in engineering applications—remain limited. In this work, we integrate experimental characterization with theoretical modeling to examine the impact, spreading, and freezing dynamics of two successive droplets on an inclined ice-covered aluminum substrate. Experiments were conducted across a range of inclination angles (0°–30°), surface temperatures (–30 to –15°C), and impact heights (20–50 cm). Our results reveal that the second droplet undergoes asymmetric spreading over the pre-frozen layer, governed by the coupled influence of thermal and geometric parameters on freezing duration. By applying energy conservation principles, we developed a theoretical model to predicts the maximum spreading diameter. This model incorporates key mechanisms, including dynamic contact angle evolution, ice-layer melting, and energy dissipation during phase change, achieving a prediction error within 2%. Furthermore, the observation that droplet behavior stabilizes after the third impact provides valuable theoretical insights and a robust predictive framework for the design of advanced anti-icing systems.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323626","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 Surface Progressive Waves Propagating over a Sloping Wavy Seabed 在倾斜波浪形海床上传播的表面渐进波的演化

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-06-28 DOI: 10.1134/S001546282560316X

H. C. Wu, Y. Y. Chen, C. Y. Cheng

{"title":"Evolution of Surface Progressive Waves Propagating over a Sloping Wavy Seabed","authors":"H. C. Wu, Y. Y. Chen, C. Y. Cheng","doi":"10.1134/S001546282560316X","DOIUrl":"10.1134/S001546282560316X","url":null,"abstract":"To investigate the evolution of surface progressive waves propagating over a sloping wavy seabed, this study employes a perturbation expansion approach with three governing parameters, namely, the equivalent wave amplitude ({{a}_{0}}), the seabed slope (alpha ), and the amplitude of wavy seabed structures (b). These parameters are used to derive analytical solutions, including those under conditions involving the generation of reflected free waves, while avoiding singularities arising from resonant conditions in the wave field. Moreover, the reflected wave induced at the resonant point by a sloping wavy seabed is investigated. This resonance is amplified by the shoaling effect, which potentially contributes to the formation of large surges or freak waves. This amplification effect is stronger for longer-period waves near the coast and for steeper seabed slopes. When (b = 0), the solution reduces to the classical sloping seabed case, capturing the effects of wave shoaling, wave set-down, and return flow generation (caused by variations in the water depth). Alternatively, when (alpha = 0), the solution corresponds to a wavy seabed in a scenario involving a constant average water depth. In both limiting cases, the analytical solutions satisfy the principle of wave energy conservation. The reflection coefficients, including those associated with resonance, are determined in each limiting case. Comparisons with experimental and analytical results from the literature confirm the accuracy and applicability of the developed formula, especially under resonant conditions. The findings of this study provide theoretical insights into wave amplification mechanisms relevant to the generation of extreme waves near coastal zones.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323623","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

Xe–He Plasma as an Active Medium of an Optically Pumped Rare Gas Laser 氦等离子体作为光抽运稀有气体激光器的有效介质

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-06-28 DOI: 10.1134/S0015462826604717

A. V. Juriev, Yu. A. Adamenkov, B. A. Vyskubenko, M. A. Gorbunov, A. A. Kalacheva, V. A. Shaidulina

引用次数: 0

Propagation of Stress and Pore Pressure in Fluid Saturated Viscoelastic Porous Media 流体饱和粘弹性多孔介质中应力和孔隙压力的传播

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-06-28 DOI: 10.1134/S0015462826604535

D. X. Yang

引用次数: 0

Study of Morphed Trailing-Edge Flaps for Wind Turbines 风力机变形尾缘襟翼研究

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-06-28 DOI: 10.1134/S0015462826604389

R. Yin, J. B. Xie, J. Yao

引用次数: 0

Water Wave Propagation in the Presence of a U-Shaped Barrier 水波在u型障碍物存在下的传播

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-29 DOI: 10.1134/S0015462826604274

S. Singh, R. B. Kaligatla, B. N. Mandal

{"title":"Water Wave Propagation in the Presence of a U-Shaped Barrier","authors":"S. Singh, R. B. Kaligatla, B. N. Mandal","doi":"10.1134/S0015462826604274","DOIUrl":"10.1134/S0015462826604274","url":null,"abstract":"In this paper, wave scattering by a U-shaped barrier and an inverse U-shaped barrier, both fixed in position and fully submerged in deep water, is illustrated. The Fredholm-type integral equations of the first kind are derived using the Havelock expansion of wave potentials and employing a matching technique. The wave reflection and transmission coefficients are derived in closed-form expressions. The integral equations are solved approximately using the Galerkin method with simple polynomials multiplied by exponential decay functions and appropriate weight functions as the basis functions. The computational results are validated against known results for a simple barrier configuration. The ways of affecting the barrier width and the submerged depth from the free surface on wave reflection, wave transmission, wave forces, and overturning moments are analyzed. The findings reveal that both barriers are highly wave-reflective over a wide range of incident wavelengths. The findings show reductions in the wave forces and the overturning moments with increases in the width and submerged depth of the barriers. These results are expected to be useful to engineers in the design of breakwaters in deeper depths.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173231","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 Investigation of Conical Tabs for Mixing Enhancement in Subsonic Circular Jets 亚音速圆形射流中锥形叶片增强混合的实验研究

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-29 DOI: 10.1134/S0015462826604420

D. L. Vasthadu Vasu Kannah, S. Bogadi

引用次数: 0

Experimental Study on the Effect of Flexibility and Amplitude–Frequency Parameters on the Hydrodynamic Propulsion Performance of Bio-Inspired Flexible Flapping-Foils 柔性和幅频参数对仿生柔性扑翼水动力推进性能影响的实验研究

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-29 DOI: 10.1134/S0015462826600331

H. Ding, K. Chen, Y. W. Zhu, Q. Gao, H. P. Shen, H. P. Shi

引用次数: 0

Design and Development of Aircraft Wing Using Various Flow Control Methods 采用多种流动控制方法的飞机机翼设计与开发

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-29 DOI: 10.1134/S0015462826600185

S. Saranya, K. Balaji, M. M. Gor, A. B. Patel, C. K. Akhil, M. Vishnupriya

{"title":"Design and Development of Aircraft Wing Using Various Flow Control Methods","authors":"S. Saranya, K. Balaji, M. M. Gor, A. B. Patel, C. K. Akhil, M. Vishnupriya","doi":"10.1134/S0015462826600185","DOIUrl":"10.1134/S0015462826600185","url":null,"abstract":"The paper aims to estimate the potency of the active flow control technique by comparing different injection suction systems on an aerofoil, with the objective of enhancing its aerodynamic performance. Various injection suction mechanisms are analysed and compared with a baseline configuration by means of numerical investigations at the flow Reynold number 5.1 × 105. The vertical injection suction system manifests significantly better results, improving the stall angle by 33%, and increasing the lift coefficient by up to 51% as compared to both the baseline and traditional co-flow jet aerofoils. This research is an effort directed to identifying and comparing suitable injection suction methods for enhancement of aerofoil performance. The novelty and superiority of the vertical injection suction system as an active flow control method need not be over-emphasized as it exhibits comparatively more promising results. Additionally, the proposed method is viable and will suffice for various applications in subsonic aircraft wings with advantages such as reduced pumping power requirements compared to the conventional co-flow jet method.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173339","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