Article
Thermodynamics
Fangfang Zhang, Xiangyu Li, Huajie Li, Jingdan Tang, Gang Chen, Leigang Zhang, Guopei Li
Summary: The impingement dynamics of 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) ionic liquid droplets on a mildly heated solid wall were studied. The impingement dynamics of water, 60 wt% IL aqueous solution, and pure IL droplets were compared, and the spreading characteristics of 60 wt% IL aqueous solution droplets under different impact velocities and surface temperatures were discussed.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Jiayu Du, Xiong Wang, Yanzhi Li, Qi Min, Xinxin Wu
Summary: Based on the energy conservation approach, a universal model has been developed to predict the maximum spreading factor of liquid droplet impact on a smooth solid surface. Through simulations and experiments, the model effectively reduces computing errors and overcomes limitations of previous models in the viscous regime. It is shown that previous models underestimated the maximum spreading factor due to an overestimation of viscous dissipation. By improving the formulation to compute viscous dissipation, the model has shown good performance in the capillary regime as well.
Article
Chemistry, Multidisciplinary
Jie Tan, Yufeng Guo, Wanlin Guo
Summary: The spreading of water nanodroplets on solid surfaces after impinging has been systematically studied using large-scale molecular dynamics simulations. It was found that the spreading rates of nanodroplets initially increase and then decrease with increasing diameter, with the highest spreading rates observed at diameters of 17-19 nm. This is due to the combined effect of the strongest interfacial and surface interactions within water molecules. The results also revealed the nonmonotonic characteristics of spreading velocity, interface work of adhesion, and surface tension with nanodroplet diameter.
Article
Green & Sustainable Science & Technology
Ke Zhao, Yang Ding
Summary: Liquid nitrogen spray cooling technology has excellent heat transfer efficiency and environmental protection performance, and plays an important role in the sustainable development of the refrigeration industry. This study adopts the coupled Level Set-VOF method to investigate the dynamic characteristics of liquid nitrogen droplet impact on solid surface. The results show that the spreading behaviors of liquid nitrogen droplet are similar to those of normal medium, but the conditions for morphological transformations are different.
Article
Thermodynamics
Fang-Fang Zhang, Geng Chen, Pei Yuan, Chuang-Yao Zhao, Hua-Jie Li, Xiang-Yu Li
Summary: The impingement dynamics of a promising ionic liquid absorbent on heated porous surfaces in absorption refrigeration were studied experimentally, revealing that the residual volume decreases linearly with increasing contact time at 323.15 K and exhibits a polynomial behavior at higher heating temperatures. Compared to deionized water droplets, oscillations and capillary waves were not observed in the studied ionic liquid droplets.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2021)
Article
Thermodynamics
C. Kuhn, D. Schweigert, C. Kuntz, M. Boernhorst
Summary: The interaction between urea water solution droplets and surfaces plays a crucial role in understanding liquid film formation in diesel-powered engines. Experimental studies on single droplet impingement on porous steel surfaces were conducted to investigate the impacts under various conditions and surface properties. The results provide insights into the influence of surface properties on transition boundaries and the effects of porosity on wetting boundaries.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Eric D. Lee, Daniel Maynes, Julie Crockett, Brian D. Iverson
Summary: This paper presents an experimental study on drop impingement and thermal atomization on hydrophobic and superhydrophobic surfaces. The results show that superhydrophobic surfaces can completely suppress atomization and the maximum atomization temperature as well as the time of maximum atomization are both related to the parameters of the superhydrophobic surfaces.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Mechanical
Jorge Duarte Benther, Sanjiv Gunasekera, Petros Lappas, Gary Rosengarten
Summary: The surface durability of materials used in electronics and heat exchangers under water spray impingement was investigated. Different surface characteristics were tested, including surface hardness, roughness, and contact angle. While material loss and hardness alterations were insignificant, changes in surface morphology were observed. The water repellent coatings were damaged during the sprays, resulting in the loss of low wettability.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jiayu Du, Yiyang Zhang, Qi Min
Summary: This study investigated the spreading and retraction dynamics of viscous droplets impact on flat solid surfaces using an efficient continuum-level modeling method. The study analyzed the influence of droplet viscosity, impact velocity, and material wettability on the dynamic characteristics of droplets, and developed multiple general correlations to predict various factors. It was successfully proven that this modeling method can be reliably applied to investigations of both droplet spreading and retraction processes.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Chemical
Ziqi Li, Guina Yi, Ziqi Cai, Zhengming Gao
Summary: In this study, the behavior of two non-Newtonian droplets during their impingement and mixing on a solid surface was investigated using the Many Body Dissipative Particle Dynamics method. The relationship between droplet morphology and the Weber number of the impinging droplet was studied, and the mixing process was divided into two stages dominated by convection and molecular diffusion, respectively. The study also revealed a special phenomenon in the mixing process caused by the difference in particle diffusion coefficients.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Fuqiang Chu, Zhongyuan Ni, Dongsheng Wen, Yanhui Feng, Shaokang Li, Lei Jiang, Zhichao Dong
Summary: Liquid manipulation plays a crucial role in daily life and future technological processes. This study demonstrates a droplet-impact-induced liquid film sculpture strategy on a microstructured heterowettable surface, which can precisely sculpt a liquid film into any desired pattern. The liquid film sculpture exhibits self-propulsion and high construction speed, making it suitable for various applications such as no-spray printing, painting, cleaning, and drawing.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Thermodynamics
Bo Chen, Yuhang Zhang, Zhaofeng Dai, Chen Wang, Xiaosong Zhang
Summary: The propagation behavior of droplets in air treatment was studied. An experimental platform was established to observe the variations in droplet impact behavior, and it was found that impact velocity and contact angle are the key factors influencing droplet morphology.
Article
Chemistry, Multidisciplinary
Xuehua Zhang, Zixiang Wei, Howon Choi, Hao Hao, Huaiyu Yang
Summary: This study reports on the solvent-exchange crystallization processes of beta-alanine on solid surfaces in a mixture of isopropanol and water. It was found that flow rates and solid surfaces significantly influence droplet size, growth rate, and crystal size and morphology. Rapid flow rates result in spherical-cap structures while slow flow rates lead to crystal microdomains or thin films. Surfaces with high hydrophilicity form thin films without droplet formation.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Thermodynamics
Jorge Duarte Benther, Juan Diego Pelaez Restrepo, Cameron Stanley, Gary Rosengarten
Summary: This study investigates the interaction between droplets and surfaces with different wettabilities in spray cooling, comparing the heat transfer performance of uncoated and coated surfaces. Results show that the uncoated surface has higher heat transfer rates compared to the coated one, with higher droplet velocities leading to increased heat transfer. The reduced cooling performance of successive droplets on uncoated surfaces is due to thermal resistance and damping effects from the first droplet.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yue Ma, Huang Zhang, Qianfeng Liu
Summary: This study experimentally investigates the spreading and splashing behavior of continuous droplets impinging on a heated wall under different conditions. The spreading parameters of the droplets and the relationship between splashing parameters, droplet Weber numbers, and Jacob numbers are analyzed and mathematically fitted.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yukihiro Yonemoto, Tomoaki Kunugi
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2016)
Article
Multidisciplinary Sciences
Junko Tsuboki, Yukio Fujiwara, Hasita Horlad, Daisuke Shiraishi, Toshihiro Nohara, Shingo Tayama, Takeshi Motohara, Yoichi Saito, Tsuyoshi Ikeda, Kiyomi Takaishi, Hironori Tashiro, Yukihiro Yonemoto, Hidetaka Katabuchi, Motohiro Takeya, Yoshihiro Komohara
SCIENTIFIC REPORTS
(2016)
Article
Thermodynamics
Yukihiro Yonemoto, Tomoaki Kunugi
HEAT TRANSFER RESEARCH
(2017)
Article
Engineering, Multidisciplinary
Tairo Yokokura, Yuta Nakashima, Yukihiro Yonemoto, Yuki Hikichi, Yoshitaka Nakanishi
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2017)
Article
Thermodynamics
Yukihiro Yonemoto, Shosuke Suzuki, Sae Uenomachi, Tomoaki Kunugi
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Engineering, Multidisciplinary
Yukihiro Yonemoto, Tomoaki Kunugi
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2014)
Article
Mechanics
Yukihiro Yonemoto, Tomoaki Kunugi
Article
Multidisciplinary Sciences
Yukihiro Yonemoto, Tomoaki Kunugi
SCIENTIFIC WORLD JOURNAL
(2014)
Article
Materials Science, Multidisciplinary
Yukihiro Yonemoto, Tomoaki Kunugi
Article
Physics, Multidisciplinary
Yukihiro Yonemoto, Tomoaki Kunugi
Article
Physics, Fluids & Plasmas
Yukihiro Yonemoto, Kanta Tashiro, Minori Yamashita, Tomoaki Kunugi
Summary: This study experimentally observed the splashing behaviors of water-ethanol binary mixture droplets on roughened solid surfaces, and investigated the effects of surface tension, viscosity, and wettability/surface roughness on splashing occurrence. The results showed that liquid properties and quantifying surface conditions are important factors for predicting splashing behavior.
Article
Physics, Fluids & Plasmas
Masaki Toshimitsu, Yukihiro Yonemoto, Akimaro Kawahara
Summary: Experimental investigation was conducted on the flow characteristics of single-phase liquid and gas-liquid two-phase flows in a horizontal rectangular micro-channel, with a focus on pressure change at the contraction. Air, distilled water, and three different aqueous solutions were used as test fluids, showing good agreement between the newly developed correlation calculations and measured values within a 30% error margin.
Article
Engineering, Multidisciplinary
Yukihiro Yonemoto, Tomoaki Kunugi
ATOMIZATION AND SPRAYS
(2017)
Proceedings Paper
Mechanics
Yukihiro Yonemoto, Tomoaki Kunugi
8TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS
(2014)