Droplet最新文献_第2页

Inside Front Cover, Volume 4, Number 2, April 2025 封面内页，第四卷，第二期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70012

Zhejun Chong, Yi Zeng, Youlong Kang, Ke Ding, Xin Du, Zhongze Gu

引用次数: 0

Front Cover, Volume 4, Number 2, April 2025 封面，第四卷，第2期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70008

Tianhua Chen, Wenming Li

引用次数: 0

Back Cover, Volume 4, Number 2, April 2025 封底，第四卷，第二期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70010

Zhifeng Hu, Haojiang Ran, He Shan, Fuqiang Chu, Zuankai Wang, Ruzhu Wang

引用次数: 0

Inside Back Cover, Volume 4, Number 2, April 2025 内页封底，第四卷，第二期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70011

Leyun Feng, Wonjae Choi, Kyoo-Chul Park

引用次数: 0

Bubble-induced symmetry breaking in droplet impact 液滴撞击中气泡诱导的对称性破缺

Droplet Pub Date : 2025-04-02 DOI: 10.1002/dro2.70006

Ying Zhou, Wenchang Zhao, Shiyu Wang, Yanhong Li, Shuxian Tang, Yutong Zheng, Pingan Zhu

引用次数: 0

Orbital electrowetting for versatile droplet maneuvering on slippery surfaces 轨道电润湿的多功能液滴机动光滑的表面

Droplet Pub Date : 2025-04-01 DOI: 10.1002/dro2.70001

Jie Tan, Haolan Li, Xiaotong Yan, Mingfei Zhou, Shulan Sun, Dongyue Jiang

{"title":"Orbital electrowetting for versatile droplet maneuvering on slippery surfaces","authors":"Jie Tan, Haolan Li, Xiaotong Yan, Mingfei Zhou, Shulan Sun, Dongyue Jiang","doi":"10.1002/dro2.70001","DOIUrl":"https://doi.org/10.1002/dro2.70001","url":null,"abstract":"Contactless, spatiotemporal droplet maneuvering plays a critical role in a wide array of applications, including drug delivery, microfluidics, and water harvesting. Despite considerable advancements, challenges persist in the precise transportation, splitting, controlled steering, and functional adaptability of droplets when manipulated by electrical means. Here, we propose the use of orbital electrowetting (OEW) on slippery surfaces to enable versatile droplet maneuvering under a variety of conditions. The asymmetric electrowetting force that is generated allows highly efficient droplet manipulation on these surfaces. Our results demonstrate that droplets can be split, merged, and steered with exceptional flexibility, precision, and high velocity, even against gravity. Additionally, the OEW technique facilitates the manipulation of droplets across different compositions, volumes, and arrays in complex environments, leaving no residue. This novel droplet maneuvering mechanism and control strategy are poised to impact a range of applications, from chemical reactions and self-cleaning to efficient condensation and water harvesting.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144673007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hypergolic droplet‒film interaction dynamics at high temperatures 高温下自燃液滴-膜相互作用动力学

Droplet Pub Date : 2025-03-28 DOI: 10.1002/dro2.70003

Yuxin Song, Zuohua Huang, Chenglong Tang

{"title":"Hypergolic droplet‒film interaction dynamics at high temperatures","authors":"Yuxin Song, Zuohua Huang, Chenglong Tang","doi":"10.1002/dro2.70003","DOIUrl":"https://doi.org/10.1002/dro2.70003","url":null,"abstract":"Liquid film cooling serves as a critical thermal protection mechanism in rocket thrusters. The interaction between oxidizer droplet, which is deposited from mainstream region of thrust chamber, and fuel film on the wall inevitably influences cooling efficiency, which is poorly understood in existing research. This study experimentally investigated hypergolic reaction between white fuming nitric acid droplet and ionic liquid fuel film at elevated wall temperature Tw using synchronized high-speed and infrared thermography. Results show that reaction progresses through inertia-dominant spreading, mixing, and culminates in intense liquid-phase explosion (micro-explosion). An elevated Tw intensifies micro-explosion, increasing the risk of wall exposure and leading to the decline of cooling efficiency. Paradoxically, the increase in local film temperature inversely correlates with Tw, which is related to reduced explosion delay time. These findings first provide thermal and hydrodynamic data essential for the design of future thermal protection measures for small hypergolic liquid rocket thrusters and offer theoretical basis for optimizing liquid film cooling systems in bipropellant propulsion architectures.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144673185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Containerless emulsification of acoustically levitated composite drop 声悬浮复合液滴的无容器乳化

Droplet Pub Date : 2025-03-24 DOI: 10.1002/dro2.70005

Mengchen Cui, Hongyue Chen, Xiuxing Tang, Yutong Guo, Xianyu Nong, Changlin Ding, Zhijun Wang, Xin Gao, Duyang Zang

{"title":"Containerless emulsification of acoustically levitated composite drop","authors":"Mengchen Cui, Hongyue Chen, Xiuxing Tang, Yutong Guo, Xianyu Nong, Changlin Ding, Zhijun Wang, Xin Gao, Duyang Zang","doi":"10.1002/dro2.70005","DOIUrl":"https://doi.org/10.1002/dro2.70005","url":null,"abstract":"Emulsions are inherently thermodynamically unstable dispersions that are widely involved in food processing, cosmetic preparation, and drug delivery. The existing ultrasonic emulsification techniques mainly rely on the direct contact between the sonicator probe and liquids, which causes localized high temperature and pressure within the liquid and influences the final properties of the obtained emulsion. In this work, a containerless emulsification approach has been realized by using ultrasonic levitation. The emulsification of water‒oil system can be promoted by adjusting the emitter‒reflector distance to alter the acoustic radiation pressure on the surface of the levitated drop. The dynamic behaviors of the emulsification process were monitored by using a high-speed camera, and the sound field was analyzed via numerical simulation. The experimental results showed that atomization of droplets driven by sound field was the main driving force for emulsification. This method can be used to prepare emulsions in which the average diameter of the droplets was about 2–3 µm. The work provided a new method for containerless emulsification, thus shedding light on the preparation of contamination-free pharmaceuticals.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144673101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surfactant-mediated mobile droplets on smooth hydrophilic surfaces 光滑亲水表面上表面活性剂介导的可移动液滴

Droplet Pub Date : 2025-03-21 DOI: 10.1002/dro2.70004

Mohammad Alipanahrostami, Tyler R. McCoy, Mi Li, Wei Wang

{"title":"Surfactant-mediated mobile droplets on smooth hydrophilic surfaces","authors":"Mohammad Alipanahrostami, Tyler R. McCoy, Mi Li, Wei Wang","doi":"10.1002/dro2.70004","DOIUrl":"https://doi.org/10.1002/dro2.70004","url":null,"abstract":"Achieving mobile liquid droplets on solid surfaces is crucial for various practical applications, such as self-cleaning and anti-fouling coatings. The last two decades have witnessed remarkable progress in designing functional surfaces, including super-repellent surfaces and lubricant-infused surfaces, which allow droplets to roll/slide on the surfaces. However, it remains a challenge to enable droplet motion on hydrophilic solid surfaces. In this work, we demonstrate mobile droplets containing ionic surfactants on smooth hydrophilic surfaces that are charged similarly to surfactant molecules. The ionic surfactant-laden droplets display ultra-low contact angle and ultra-low sliding angle simultaneously on the hydrophilic surfaces. The sliding of the droplet is enabled by the adsorbed surfactant ahead of three-phase contact line, which is regulated by the electrostatic interaction between ionic surfactant and charged solid surface. The droplet can maintain its motion even when the hydrophilic surface has defects. Furthermore, we demonstrate controlled manipulation of ionic surfactant-laden droplets on hydrophilic surfaces with different patterns. We envision that our simple technique for achieving mobile droplets on hydrophilic surfaces can pave the way to novel slippery surfaces for different applications.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly efficient spray cooling enabled by acoustic microdroplet atomizer 采用声学微滴雾化装置，实现高效喷雾冷却

Droplet Pub Date : 2025-03-08 DOI: 10.1002/dro2.70002

Tianhua Chen, Wenming Li

{"title":"Highly efficient spray cooling enabled by acoustic microdroplet atomizer","authors":"Tianhua Chen, Wenming Li","doi":"10.1002/dro2.70002","DOIUrl":"https://doi.org/10.1002/dro2.70002","url":null,"abstract":"Droplets are ubiquitous in nature and play an essential role in spray cooling, which is a highly efficient cooling approach for high-power-density miniaturized electronic devices. However, conventional pressure-driven spray faces significant challenges in controlling microdroplet characteristics, particularly the droplet size and spray direction, both of which critically impact cooling performance. Herein, to conquer these challenges, we designed an acoustic microdroplet atomizer composed of a lead zirconate titanate (PZT) transducer and silicon inverted pyramid nozzles. This design enables precise control of droplet generation, overcoming the limitations of traditional spray methods. The acoustic atomization technology minimizes excess liquid accumulation while significantly enhancing thin liquid film evaporation. Compared to the conventional droplet generation techniques such as pressure-driven, injector-based, and piezoelectric spray, our acoustic atomizer achieves superior cooling performance. Notably, we demonstrate a high heat flux of ∼220 W/cm2 with a 3.6-fold enhancement at a low flow rate of 24 mL/min, achieving significantly improved cooling efficiency. Finally, our acoustic atomizer provides precise control over droplet size, velocity, and flow rate by adjusting the number of nozzles and the PZT transducer's resonant frequency, elevating spray cooling performance. This novel acoustic atomization cooling technology holds great promise for practical applications, particularly in the thermal management of compact electronic components.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0