Article
Thermodynamics
Konghua Yang, Kaidiao Jin, Jiawei Xiong, Yuchao Luo, Yunhong Liang, Chunbao Liu
Summary: This study developed a novel 3D method to address the Leidenfrost effect by studying the synergies of droplet velocity and surface temperature. A computational fluid dynamics simulation and high-speed video testing were conducted to investigate the dynamics of vapor and heat transfer near the Leidenfrost point. The empirical correlation between the Leidenfrost point temperature and Weber number was determined.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Nuclear Science & Technology
Kei Fujisawa
Summary: Recent research has found that the time-dependent force exerted on a droplet during high-speed impact on a rigid wall is different from that of low-speed impact due to droplet compressibility. This study considers a more general case where there is a liquid film on the wall surface during high-speed droplet impact. Three-component Euler simulations were conducted to determine the characteristics of the time-dependent force on the droplet. The force strength on the droplet decreases as the liquid film thickness increases, but the total force increases due to the presence of water hammer shock inside the film.
ANNALS OF NUCLEAR ENERGY
(2023)
Article
Thermodynamics
Xin Zhong, Yuhui Zhang, Yu Hou, Huicheng Feng, Lidong Sun
Summary: The impact dynamics of a water-ethanol binary droplet on a surface structured with titanium dioxide nanotubes is dependent on the surface temperature and ethanol concentration, resulting in six different droplet dynamics regimes. These regimes are influenced by surface temperature and ethanol concentration, with film levitation being mitigated at higher surface temperatures or ethanol concentrations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Nuclear Science & Technology
Kei Fujisawa
Summary: This study numerically investigates the effect of the impact velocity of a droplet on the time-dependent force exerted on the droplet and droplet pressure during high-speed liquid droplet impingement on a planar rigid wall. The results show that high-speed impingement involves the formation of a water hammer shock and sustained reverberation inside the droplet. The force curve exhibits oscillatory behavior and is different from that of low-speed impact cases.
ANNALS OF NUCLEAR ENERGY
(2022)
Article
Thermodynamics
Jiayu Du, Yanzhi Li, Xiong Wang, Xinxin Wu, Qi Min
Summary: Textured surfaces have the potential to inhibit Leidenfrost phenomenon and improve thermal management of high heat flux devices. Different surface structures, such as micro/nanostructures and macro-pillar arrays, have been fabricated and their effects on Leidenfrost point and water droplet dynamics are studied. Micro/nanostructures reduce the vapor pressure and increase the Leidenfrost point, while macrostructures achieve a higher Leidenfrost point through capillary wicking and high permeability. Theoretical models are established to predict Leidenfrost point considering the influence of surface structures.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Jorge Duarte Benther, Vrushub Bhatt, Juan Diego Pelaez Restrepo, Cameron Stanley, Gary Rosengarten
Summary: High heat generation in the electronics industry hampers further innovations. Spray cooling is a promising technique for cooling high-temperature objects. This study investigates the fluid dynamics and heat transfer of multiple droplet impingement, providing insights for future spray cooling system design and optimization.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Computer Science, Interdisciplinary Applications
Mirae Kim, Dong Kim
Summary: The dynamic behavior of a droplet impinging on a hot surface was investigated using high-speed cameras. De-ionized water droplets with a diameter of 2.25 mm were produced by an injection needle. The effects of surface temperature, inclination angle, and Weber number on the droplet behavior were observed. Micro-explosions were observed at lower inclination angles and the impinging droplet recovered its shape at higher inclination angles due to the Leidenfrost effect. Increasing Weber number resulted in larger spreading diameter and sliding length.
JOURNAL OF VISUALIZATION
(2023)
Article
Thermodynamics
Xingbo Dai, Wenqiang Zhang, Jingzhi Zhang, Gongming Xin, Xinyu Wang
Summary: The dynamic behavior characteristics of droplet impact on vibrating superhydrophobic microstructured surfaces in the vertical direction are evaluated using Computational Fluid Dynamics and Volume of Fluid technique. The effects of wall vibration parameters on contact time and maximum penetration depth are investigated, and it is found that changes in phase angle and droplet velocity influence the relative movement between the droplet and the vibrating surface, leading to changes in contact time and maximum penetration depth.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Environmental
Yunpeng Zhao, Huanzhi Liu, Xiaogang Shi, Xingying Lan, Jinsen Gao, Wenheng Jing, Weihong Xing
Summary: This study investigated the collision process between oil droplets and catalyst particles in the feeding section of the FCC riser reactor. It was found that the suitable collision velocity and oil droplet to catalyst diameter ratio can increase the gas film coverage area on the catalyst surface and prevent the direct contact between the liquid film with the catalyst surface. The collision eccentricity had significant effects on the vaporization rate.
CHEMICAL ENGINEERING JOURNAL
(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
Thermodynamics
Li Wang, Xin Wang, Yuying Yan
Summary: This study adopts a multi-component multiphase Lattice Boltzmann model to investigate the droplet impingement on conical obstacles. The effects of gravity, surface wettability, and surface temperature on the droplet behavior are studied. The influence of surface wettability on the droplet's movement and morphology is also examined. This study provides fundamental support to engineering applications such as spray cooling.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Engineering, Industrial
Angshuman Kapil, Nithin Kayarthaya, Vatsalya Sharma, Abhay Sharma
Summary: In recent years, on-demand metal droplet deposition has gained increased interest for its potential applications in additive manufacturing. Plasma metal inert gas droplet deposition (plasma MIG DD) allows for high-accuracy, minimal substrate melting, and minimal spatter and metal fume generation. This study develops a computational fluid dynamics-based simulation methodology to understand droplet dynamics and behavior during the deposition process. The results show that post-impingement droplet behavior is influenced by the initial droplet temperature and substrate material properties, with copper droplets exhibiting different shapes when impinging on copper or aluminum substrates. The study provides fundamental insights for optimization, process design, and reverse engineering in droplet-on-demand applications.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Review
Food Science & Technology
Ozgul Altay, Esin Selcuk, Omer Abaci, Funda Erdem, S. Nur Dirim, Utku Senturk, Figen Kaymak-Ertekin
Summary: Air impingement method is an efficient technology widely used in various industrial applications. This article discusses the performance, critical elements, and computational fluid dynamics application of air impingement technology in food processing, as well as the benefits, disadvantages, and potential trends in different food processing applications.
COMPREHENSIVE REVIEWS IN FOOD SCIENCE AND FOOD SAFETY
(2023)
Article
Thermodynamics
Edmund Lim, Boon T. Ng, Yew M. Hung, Ming K. Tan
Summary: This study investigates the suppression of the Leidenfrost effect for a droplet rolling on an inclined surface coated with graphene. The graphene coating enables vapor to escape through the nanostructure, obstructing the formation of a continuous vapor layer. The experiment observes three interesting regimes of contact boiling, intermittent contact boiling, and transient contact boiling when the droplet rolls onto the graphene-coated surface. Overall, there is a maximum temperature reduction of 64 degrees C on the heated surface with the graphene coating.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Physics, Multidisciplinary
Victor Julio Leon, Kripa K. Varanasi
Summary: The self-propulsion of boiling droplets is achieved by coupling short and long timescale phenomena, resulting from microsecond fluctuations induced by boiling events at the droplet-oil interface. This interplay leads to continuous asymmetric vapor release and momentum transfer, allowing for high droplet velocities.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Multidisciplinary
Marco Cristofaro, Wilfried Edelbauer, Phoevos Koukouvinis, Manolis Gavaises
APPLIED MATHEMATICAL MODELLING
(2020)
Editorial Material
Thermodynamics
R. D. Reitz, H. Ogawa, R. Payri, T. Fansler, S. Kokjohn, Y. Moriyoshi, A. K. Agarwal, D. Arcoumanis, D. Assanis, C. Bae, K. Boulouchos, M. Canakci, S. Curran, I. Denbratt, M. Gavaises, M. Guenthner, C. Hasse, Z. Huang, T. Ishiyama, B. Johansson, T. V. Johnson, G. Kalghatgi, M. Koike, S. C. Kong, A. Leipertz, P. Miles, R. Novella, A. Onorati, M. Richter, S. Shuai, D. Siebers, W. Su, M. Trujillo, N. Uchida, B. M. Vaglieco, R. M. Wagner, H. Zhao
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2020)
Article
Engineering, Mechanical
Maxwell Brunhart, Celia Soteriou, Christian Daveau, Manolis Gavaises, Phoevos Koukouvinis, Mark Winterbourn
Article
Thermodynamics
Aaron J. Rowane, Manolis Gavaises, Mark A. McHugh
FLUID PHASE EQUILIBRIA
(2020)
Article
Energy & Fuels
Eduardo Gomez Santos, Junmei Shi, Manolis Gavaises, Celia Soteriou, Mark Winterbourn, Wolfgang Bauer
Article
Mechanics
I. K. Karathanassis, E. Pashkovski, M. Heidari-Koochi, H. Jadidbonab, T. Smith, M. Gavaises, C. Bruecker
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2020)
Article
Thermodynamics
Alvaro Vidal, Phoevos Koukouvinis, Manolis Gavaises
FLUID PHASE EQUILIBRIA
(2020)
Article
Energy & Fuels
Aaron J. Rowane, Ashutosh Gupta, Manolis Gavaises, Mark A. McHugh
Article
Computer Science, Interdisciplinary Applications
Georgia Nykteri, Phoevos Koukouvinis, Silvestre Roberto Gonzalez Avila, Claus-Dieter Ohl, Manolis Gavaises
JOURNAL OF COMPUTATIONAL PHYSICS
(2020)
Article
Mechanics
Andreas Papoutsakis, M. Gavaises
JOURNAL OF FLUID MECHANICS
(2020)
Article
Instruments & Instrumentation
F. A. Godinez, R. Mayen-Mondragon, J. E. Guzman, O. Chavez, M. Gavaises, R. Montoya
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Chemistry, Multidisciplinary
Marco Cristofaro, Wilfried Edelbauer, Phoevos Koukouvinis, Manolis Gavaises
Article
Energy & Fuels
Houman B. Rokni, Joshua D. Moore, Manolis Gavaises
Summary: The study developed entropy-scaling based pseudo-component techniques to predict viscosity and thermal conductivity of hydrocarbon mixtures, achieving high accuracy for mixtures without branched compounds but lower accuracy for mixtures containing iso-alkanes. By fitting empirical correlations for model parameters, accurate predictions can be made without the need for experimental reference data, improving predictions to within 5% and 2% average MAPD for viscosity and thermal conductivity, respectively, relative to experimental data.
Proceedings Paper
Computer Science, Information Systems
Hesamaldin Jadidbonab, Hoang Nga Nguyen, Siraj Ahmed Shaikh, Marcin Hlond, Peter Robertson, Gajinder Panesar
Summary: This paper proposes a solution using SoC FPGA and dedicated analytics CPU to intelligently monitor network attacks on SoC and in-vehicle networks, and the effectiveness of the solution has been demonstrated in testing.
2022 IEEE INTERNATIONAL CONFERENCE ON PERVASIVE COMPUTING AND COMMUNICATIONS WORKSHOPS AND OTHER AFFILIATED EVENTS (PERCOM WORKSHOPS)
(2022)
