Physics of Fluids最新文献_第4页

Dynamic evolution mechanism of egg-shaped trapped air bubble profile during icing 结冰过程中蛋形困泡廓形的动态演化机制

2区工程技术

Physics of Fluids Pub Date : 2025-07-01 DOI: 10.1063/5.0273789

Keke Shao, Mengjie Song, Jun Shen, Xuan Zhang, Long Zhang, Chaobin Dang, Zongwei Han, Hongjin Wang

{"title":"Dynamic evolution mechanism of egg-shaped trapped air bubble profile during icing","authors":"Keke Shao, Mengjie Song, Jun Shen, Xuan Zhang, Long Zhang, Chaobin Dang, Zongwei Han, Hongjin Wang","doi":"10.1063/5.0273789","DOIUrl":"https://doi.org/10.1063/5.0273789","url":null,"abstract":"Ice with trapped air bubbles is widespread in nature and industry. These bubbles affect ice's optical, thermal, and mechanical properties, affecting the use of ice and anti- and deicing operations. To facilitate the control of the growth and distribution characteristics of the bubbles in ice, the dimensional changes during the growth have been investigated using experimental and mathematical modeling methods. A mathematical model describing the relationship between bubble radius and the freezing process has been developed based on the relationship between gas diffusion and bubble shape change at the freezing front, and experimental validation has shown that its accuracy is higher than 80%. The results show that the fifth power of bubble radius is proportional to the time at a constant freezing rate, and the third power of bubble radius is proportional to the time at a variable freezing rate. The model can provide a reference for controlling the growth and distribution characteristics of bubbles and can also pave the way for expanding the application of ice and optimizing the anti- and deicing technology.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147907132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 4

Drag reduction and air restoration of streamwise hydrophobic microtrenches 顺流疏水微沟的减阻和空气恢复

2区工程技术

Physics of Fluids Pub Date : 2025-07-01 DOI: 10.1063/5.0275156

You Nie, Y Zhang, Ding Weng, Jiadao Wang

{"title":"Drag reduction and air restoration of streamwise hydrophobic microtrenches","authors":"You Nie, Y Zhang, Ding Weng, Jiadao Wang","doi":"10.1063/5.0275156","DOIUrl":"https://doi.org/10.1063/5.0275156","url":null,"abstract":"International seaborne trade carries over 80% of the global merchandise. Over 60% of the propulsive power is consumed by friction drag. Hydrophobic surfaces, which can trap air in their surface cavities, can effectively reduce the friction drag. However, despite many successful drag reductions reported in the existing works, the optimal dimensions and hydrophobicity of the surface pattern to obtain drag reduction, maintain air stability, and air restoration seem to remain unclear. In this paper, we investigated the drag reduction and air restoration of the streamwise hydrophobic microtrenches. By analyzing the turbulent boundary layer property and air stability, the dimensions and hydrophobicity of the microtrenches were carefully determined. Microtrenches with a dimensionless width of 10 and hydrophobic coating with a static contact angle of 110.2° were prepared. The water tunnel experiments showed that the drag reduction rate of 19.9% was obtained, the air in the microtrenches was mechanically stable, and the wetted microtrenches could automatically dewet when they touched the new air. Our work implies that the streamwise hydrophobic microtrenches are capable of sustaining an effective drag reduction at a low supply of air.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147911772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Laboratory investigation of internal solitary waves breaking on reef-lagoon systems 礁湖体系内孤立波破碎的实验室研究

2区工程技术

Physics of Fluids Pub Date : 2025-07-01 DOI: 10.1063/5.0272471

Yixin Wang, Yeping Yuan, Ying‐Tien Lin, Jinbao Song

{"title":"Laboratory investigation of internal solitary waves breaking on reef-lagoon systems","authors":"Yixin Wang, Yeping Yuan, Ying‐Tien Lin, Jinbao Song","doi":"10.1063/5.0272471","DOIUrl":"https://doi.org/10.1063/5.0272471","url":null,"abstract":"Coral reefs face severe threats from bleaching and degradation driven by natural and anthropogenic factors, such as global warming and ocean acidification. Internal solitary waves (ISWs) breaking in reef-lagoon systems play a critical role in modulating coral reef ecosystems by inducing upwelling currents that deliver cold, nutrient-rich deep water to reefs, potentially mitigating thermal stress and coral bleaching. However, the hydrodynamic processes governing ISW-driven upwelling and their ecological implications remain underexplored. This study advances prior research by using synchronized particle image velocimetry and planar laser-induced fluorescence in laboratory experiments to measure high-resolution velocity and density fields over realistic reef-lagoon topographies. These measurements enable precise quantification of upwelling dynamics, including maximum run-up height, upwelling velocity, and cold-water intrusion extent and duration. We also analyze bottom Reynolds stress and turbulent burst events via quadrant analysis to elucidate mechanisms of turbulent transport, sediment resuspension, and material exchange under varying coral roughness conditions. Our findings reveal that higher ISW amplitudes enhance upwelling intensity, promoting cold-water propagation across the reef flat, while rough coral surfaces play a dual role: they impede upwelling spread but enhance near-bed turbulence and material exchange. By linking hydrodynamic metrics, such as run-up speed and upwelling flux to ecological proxies like nutrient delivery, sediment deposition, and thermal stress relief, this study provides novel insight into physical–ecological coupling in reef systems. These results deepen our mechanistic understanding of ISW-driven processes and offer a scientific foundation for developing targeted coral reef conservation and restoration strategies.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147879437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 2

Study on the effect of surfactant functions on invasion–flowback and interaction depth based on online computed tomography and numerical simulation 基于在线计算机断层扫描和数值模拟的表面活性剂函数对侵入-反排及相互作用深度的影响研究

2区工程技术

Physics of Fluids Pub Date : 2025-07-01 DOI: 10.1063/5.0277657

Xiaoyu Hou, Xudong Zhang, Jun Zhou

{"title":"Study on the effect of surfactant functions on invasion–flowback and interaction depth based on online computed tomography and numerical simulation","authors":"Xiaoyu Hou, Xudong Zhang, Jun Zhou","doi":"10.1063/5.0277657","DOIUrl":"https://doi.org/10.1063/5.0277657","url":null,"abstract":"Surfactants can enhance imbibition processes; however, water invasion also affects oil-well productivity during depletion development. Nonetheless, it remains unclear how the various functions of surfactants affect oil-well performance. In this study, core displacement experiments based on online computed tomography scanning, together with numerical simulations considering multi-field coupling, are employed to investigate the invasion–flowback characteristics. The results show that the regained permeability drops to 24% after distilled water invasion, whereas the wettability alteration and ultra-low interfacial tension (IFT) systems increase that to 30% and 43%, respectively. Due to the Jamin effect, the solubilization and the self-emulsification systems maintain high water saturation at fracture face after flowback, reducing regained permeability to 11.3% and 14.5%, respectively. The invasion depth of distilled water reaches 65 mm, whereas the addition of surfactants reduces it to approximately 50 mm. The water saturation at invasion front of the wettability alteration system is approximately 0.45; however, due to the ultra-low IFT, the water saturations of the ultra-low IFT, self-emulsification, and solubilization systems reach 0.6–0.7. Numerical simulations show that surfactant adsorption confines its effective action zone to a region much smaller than the water invasion depth. The ultra-low IFT system maintains high surfactant concentrations and the originally low IFT only within 0–10 mm, beyond which the concentration decreases exponentially. This study provides a deeper insight into the surfactant–matrix interactions, thereby facilitating the design of fracturing completions.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147899035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Surfactant on the production effect of integrated shut-in, flowback, and production process, and the water phase migration law 表面活性剂对关井、返排、生产一体化过程的生产效果以及水相运移规律的影响

2区工程技术

Physics of Fluids Pub Date : 2025-06-01 DOI: 10.1063/5.0272426

Xiaoyu Hou, Xudong Zhang, Jun Zhou

{"title":"Surfactant on the production effect of integrated shut-in, flowback, and production process, and the water phase migration law","authors":"Xiaoyu Hou, Xudong Zhang, Jun Zhou","doi":"10.1063/5.0272426","DOIUrl":"https://doi.org/10.1063/5.0272426","url":null,"abstract":"Surfactants in fracturing fluids enhance oil recovery by imbibition and reduce flow resistance in water-invaded regions, thus improving recovery during depletion development. The total oil recovery of a well is determined by both the imbibition oil recovery and the depletion development. However, it remains unclear which surfactant most effectively increases the total oil recovery. In this work, an integrated experimental platform for shut-in, flowback, and depletion production based on online nuclear magnetic resonance was constructed to investigate the effects of surfactants on oil production and the migration of invaded water. The results indicate that the ultra-low interfacial tension (IFT) system is dominated by fluid loss during the shut-in process, while the wettability alteration system is dominated by fluid loss at high shut-in pressures and transitions to a capillary force-controlled imbibition process at low shut-in pressures and permeabilities. In the early stage of shut-in, surfactant solutions mainly invade the macropores, while the countercurrent imbibition primarily occurs at the later stage. Additionally, for the wettability alteration system, the invaded surfactant solution is driven by capillary forces from macropores to micropores and mesopores. From the total oil recovery results, ultra-low IFT systems are recommended to increase formation pressure during shut-in and enhance residual oil permeability in depletion phases at high shut-in pressures and permeabilities. Conversely, at lower pressures and permeabilities, wettability alteration systems are advised to enhance imbibition during shut-in. This research clarifies surfactant stimulation mechanisms throughout reservoir development, providing practical guidance for selecting appropriate surfactants and optimizing shut-in processes in tight oil reservoirs.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147896746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Beyond primitive bionic surfaces: Bionic structures coupled surface with superhydrophobicity and programmable directional adhesion 超越原始仿生表面：具有超疏水性和可编程定向粘附的仿生结构耦合表面

2区工程技术

Physics of Fluids Pub Date : 2025-06-01 DOI: 10.1063/5.0270879

Qinlin Wan, Xingjun Hu, Jingyu Wang, Hongda Shi, Wentao Yu, Daqian Wang, Firoz Alam, Yingai Jin, Tianming Yu, Peng Guo, Wei Lan, Keyuan Shi

{"title":"Beyond primitive bionic surfaces: Bionic structures coupled surface with superhydrophobicity and programmable directional adhesion","authors":"Qinlin Wan, Xingjun Hu, Jingyu Wang, Hongda Shi, Wentao Yu, Daqian Wang, Firoz Alam, Yingai Jin, Tianming Yu, Peng Guo, Wei Lan, Keyuan Shi","doi":"10.1063/5.0270879","DOIUrl":"https://doi.org/10.1063/5.0270879","url":null,"abstract":"The Cassie state surface, exemplified by lotus and rice leaves, and the Wenzel state surface, exemplified by rose petals, are both superhydrophobic due to their unique structures. The objective is to expand the primitive wettability function of a single bionic structure by coupling various bionic structures in the corresponding wetting state region on an entire surface. The rice leaf–rose petal structures coupled (RRSC) aluminum surfaces were fabricated by micro-milling. The rice leaf wall substrate forms an air layer in the Cassie state. The Wenzel roughness is controlled by the rose petal crown. The RRSC surface is more hydrophobic than a single bionic surface, and it can also be programmed for adhesion and directional diffusion. An augmentation of up to 0.57° in contact angle and 3.34° in run-off angle per micrometer of rose petal crown width is exhibited. A model for identifying the wetting states on rough surfaces is developed, and the effect of two bionic structures on wetting states is analyzed quantitatively. The rose petal crown is observed to retain the air layer by impeding droplet penetration. By determining the free energy and adhesion work, the superhydrophobicity and programmable adhesion originate from the cooperative interaction and internal competition between two wetting states, respectively. This article presents a new theoretical thermodynamic model for analyzing wetting states, wettability, and adhesion on rough surfaces. The bionic structures coupled strategy is proposed to exceed the primitive wettability of bionic surfaces by coordinating natural surface characteristics in different wetting states.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147898968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 6

Time-dependent diffusion in one-dimensional disordered media decorated by permeable membranes: Theoretical findings backed by simulations and a new disorder class. 由可透膜装饰的一维无序介质中的时间相关扩散：由模拟和一种新的无序类支持的理论发现。

IF 3.8 2区工程技术

Physics of Fluids Pub Date : 2025-06-01 Epub Date: 2025-06-27 DOI: 10.1063/5.0272370

Magnus Herberthson, Peter J Basser, Evren Özarslan

引用次数: 0

Triangular nozzle structure control of droplet generation hydrodynamics in microfluidic step emulsification devices 微流控阶梯乳化装置中液滴生成流体动力学的三角喷嘴结构控制

2区工程技术

Physics of Fluids Pub Date : 2025-05-01 DOI: 10.1063/5.0266035

Yue Lu, Liangyu Wu, Wei Yu, Xiangdong Liu, Yongping Chen

{"title":"Triangular nozzle structure control of droplet generation hydrodynamics in microfluidic step emulsification devices","authors":"Yue Lu, Liangyu Wu, Wei Yu, Xiangdong Liu, Yongping Chen","doi":"10.1063/5.0266035","DOIUrl":"https://doi.org/10.1063/5.0266035","url":null,"abstract":"The nozzle structure is identified as a critical factor in controlling monodisperse droplet generation in microfluidic step emulsification devices. Two groups of meticulously designed microfluidic step emulsification devices with distinct triangular nozzles are introduced in this study to systematically investigate the hydrodynamic control of droplet generation by the triangular nozzle structure. Dripping and jetting regimes were characterized through regime diagrams, with the dripping regime identified as optimal for producing highly monodisperse droplets that are insensitive to flow rate variations. An opening angle of 10° was determined as the optimal triangular nozzle design, significantly enhancing the stability of the dripping regime. In this regime, the duration of confined-growing stage exhibits a positive correlation with nozzle volume and ultimately determines the resulting droplet size. Furthermore, the morphological evolution of the dispersed phase within the triangular nozzle was demonstrated to govern the interfacial dynamics throughout the entire droplet generation cycle, closely associated with the nozzle structure. Based on these insights, a predictive model incorporating the triangular nozzle structure was proposed to estimate droplet size in step emulsification devices under the dripping regime, achieving reliable predictions with a maximum relative error of 30%. These findings provide a theoretical and practical framework for customizing droplet size in microfluidic applications, contributing to enhanced precision and efficiency in monodisperse droplet generation.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147909020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Hemodynamic simulation and in vitro modeling of three-dimensional glomeruli at anatomical scale. 三维肾小球血流动力学模拟及体外解剖模型的建立。

IF 4.3 2区工程技术

Physics of Fluids Pub Date : 2025-05-01 Epub Date: 2025-05-16 DOI: 10.1063/5.0264128

Dongjune A Kim, Andres Armenta, Joshua C Vaughan, Mark Terasaki, Jonathan Himmelfarb, Ying Zheng

引用次数: 0

Development and evaluation of a Janus amphiphilic carbon nanotube-based nanofluid for enhanced heavy oil recovery 用于提高稠油采收率的Janus两亲性碳纳米管纳米流体的开发与评价

2区工程技术

Physics of Fluids Pub Date : 2025-05-01 DOI: 10.1063/5.0269551

Qingyuan Chen, Maofan Ye, Dongdong Wang, Xing Yin, Jiayue Lu, Wanfen Pu, Jingjing Zhong, 博大水

{"title":"Development and evaluation of a Janus amphiphilic carbon nanotube-based nanofluid for enhanced heavy oil recovery","authors":"Qingyuan Chen, Maofan Ye, Dongdong Wang, Xing Yin, Jiayue Lu, Wanfen Pu, Jingjing Zhong, 博大水","doi":"10.1063/5.0269551","DOIUrl":"https://doi.org/10.1063/5.0269551","url":null,"abstract":"Heavy oil stands as a pivotal unconventional resource. The reduction of heavy oil viscosity through emulsification emerges as a critical strategy for augmenting its recovery. In this study, a novel Janus amphiphilic carbon nanotube (JCMS18) was synthesized utilizing Pickering emulsion templating and emulsion polymerization. The structural integrity of JCMS18 was meticulously characterized employing Fourier-transform infrared spectroscopy, atomic force microscopy, scanning electron microscopy, and transmission electron microscopy. Contact angle measurements further confirm the unique amphiphilicity of JCMS18. A JCMS18-based nanofluid viscosity reducer was subsequently formulated by amalgamating JCMS18 with cocamidopropyl betaine and sodium alcohol ether sulfate. The findings revealed that JCMS18 exhibits exceptional interfacial tension (IFT) reduction capabilities. At a concentration of 0.02 wt. %, JCMS18 diminished the oil–water IFT to 15.8 mN/m. The JCMS18 nanofluid further reduced the heavy oil/water IFT to 5.418 × 10−2 mN/m. Microscopic displacement experiments disclosed that the JCMS18 nanofluid significantly curtailed residual oil saturation, encompassing blind-end, columnar, cluster, and film-like residual oil. Core flooding experiments demonstrated that 0.3 pore volumes of JCMS18 nanofluid enhanced oil recovery by 26.16% in a 1500-mD core. Nuclear magnetic resonance displacement experiments corroborated that the primary mechanisms of JCMS18 for enhanced oil recovery are emulsification, viscosity reduction, and wettability alteration. These findings underscore the substantial potential of JCMS18 nanofluid for heavy oil development.","PeriodicalId":20066,"journal":{"name":"Physics of Fluids","volume":"37 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147880312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 5