Relevant bibliographies by topics / Water Droplets Impacting

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  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Water Droplets Impacting'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Water Droplets Impacting"

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Li, Zong, Naixiao Wang, Kai Dong, Lei Mu, Bin Cao, and Liming Wang. "Flashover characteristics of a droplet impacting the silicone rubber surface." AIP Advances 13, no. 1 (2023): 015024. http://dx.doi.org/10.1063/5.0133723.

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The surface discharge of silicone rubber (SIR) is one of the main reasons to accelerate the aging of its surface material in power systems. It is known that static water droplets on the SIR surface can make the flashover voltage substantially fall, while the flashover characteristics of water droplets impacting the SIR surface are unknown. In this work, the dynamic flashover characteristics of the water droplets impacting the SIR surface are studied. When the water droplets impact the SIR surface, they will stretch first and then shrink. The minimum flashover voltage occurs at the moment when
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Yao, S. C., L. E. Hochreiter, and K. Y. Cai. "Dynamics of Droplets Impacting on Thin Heated Strips." Journal of Heat Transfer 110, no. 1 (1988): 214–20. http://dx.doi.org/10.1115/1.3250454.

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Experiments were conducted with water droplets impacting on the edge of thin steel strips that were heated to beyond the Leidenfrost temperature. High-speed movies were taken and analyzed and showed that the shattered droplets were generally bimodal in size distribution. The volume ratio of these two size groups of generated droplets, the mean diameter of droplets, and the ejection angles and velocities of shattered droplets are shown as a function of incoming droplet Weber number, the ratio of incoming droplet diameter to strip thickness, and the offset of the droplet relative to the strip. T
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Kooij, S. A., A. M. Moqaddam, T. C. de Goede, et al. "Sprays from droplets impacting a mesh." Journal of Fluid Mechanics 871 (May 22, 2019): 489–509. http://dx.doi.org/10.1017/jfm.2019.289.

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In liquid spray applications, the sprays are often created by the formation and destabilization of a liquid sheet or jet. The disadvantage of such atomization processes is that the breakup is often highly irregular, causing a broad distribution of droplet sizes. As these sizes are controlled by the ligament corrugation and size, a monodisperse spray should consist of ligaments that are both smooth and of equal size. A straightforward way of creating smooth and equally sized ligaments is by droplet impact on a mesh. In this work we show that this approach does however not produce monodisperse d
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Xing, Lei, Jinyu Li, Minghu Jiang, and Lixin Zhao. "Dynamic behavior of compound droplets with millimeter-sized particles impacting substrates with different wettabilities." Physics of Fluids 35, no. 2 (2023): 022108. http://dx.doi.org/10.1063/5.0137505.

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The dynamic behavior of compound droplets, which are made up of a millimeter-sized particle and distilled water, impacting substrates of different wettabilities is investigated via high-speed photography. The effects of the size of the particle within the compound droplet, substrate contact angle, and impact height on the deformation of the droplets and the characteristics of the impact are analyzed. It is found that the collisions of compound droplets with substrates can be classified into four categories based on the observed experimental phenomena that occur during the impact. These categor
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KIM, SEOL HA, JUN YOUNG KANG, HO SEON AHN, HANG JIN JO, and MOO HWAN KIM. "STUDY OF LEIDENFROST MECHANISM IN DROPLET IMPACTING ON HYDROPHILIC AND HYDROPHOBIC SURFACES." International Journal of Air-Conditioning and Refrigeration 21, no. 04 (2013): 1350028. http://dx.doi.org/10.1142/s2010132513500284.

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Water droplets, 2 mm in diameter, were allowed to fall freely onto hydrophobic and hydrophilic heated surfaces, and their impacts were imaged using high-speed cameras to investigate the droplet dynamics and heat transfer. As the heating power increased, the water droplets evaporated faster, eventually hovering over the surface due to the formation of a boiling film when the Leidenfrost point (LFP) was reached. The heat transfer from the surface into the droplet was evaluated, and LFP transition phenomena were investigated using time-resolved imaging of both side and bottom views. The hydrophil
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Cox, T. L., and S. C. Yao. "Heat Transfer of Sprays of Large Water Drops Impacting on High Temperature Surfaces." Journal of Heat Transfer 121, no. 2 (1999): 446–50. http://dx.doi.org/10.1115/1.2825998.

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Experiments were performed to evaluate the heat transfer of monodisperse sprays of large droplet diameters, ranging from 3 to 25 mm, on high temperature surfaces. This range of drop sizes has not previously been studied, and it was of interest to determine their heat transfer characteristics and how they relate to sprays of smaller drops. Parametric tests showed that the spray heat flux depends on mass flux with a power-law relationship, and that spray effectiveness, which relates the actual spray heat transfer to the maximum heat transfer potential, varies with d−1/2. There was no discernible
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Wibowo, Teguh, Arif Widyatama, Samsul Kamal, Indarto, and Deendarlianto. "The effect of pressure and frequency on the dynamic behavior and evaporation time of successive water droplets impacting onto hot surface." MATEC Web of Conferences 154 (2018): 01107. http://dx.doi.org/10.1051/matecconf/201815401107.

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Multiple droplets are the drop of water which continuously dropped on a surface in certain time difference. The phenomenon droplets impacting a solid surface can be found in a various field, one of them is the cooling process in the metal industry. The cooling process is carried out by spraying a number of water droplets to hot surface until it reaches the desired condition. When droplets impinge on the surface, the dynamics of droplets, such as the spreading and recoil phenomena, depend on some properties. In this study, the effect of pressure and drop frequency to the droplet characteristics
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Liu, C. C. "Numerical simulation of two droplets impacting on the wall continuously." Journal of Physics: Conference Series 2345, no. 1 (2022): 012006. http://dx.doi.org/10.1088/1742-6596/2345/1/012006.

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Abstract The application of spray system has been widely used in the industry. The impact of droplets between the wall impact has become one of the important studies of spray system. The investigation is to develop a numerical code for the simulation of two water droplets impinging continuously upon the wall. In the code, the structured single-block and staggered grid system are adopted for discretization of the space domain, while the finite volume method is applied to solve iteratively the governing equations of mass and momentum. The interconnection between the velocities and pressure is de
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Reichard, Donald L. "Drop Formation and Impaction on the Plant." Weed Technology 2, no. 1 (1988): 82–87. http://dx.doi.org/10.1017/s0890037x00030153.

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The effect of variables that influence the retention of spray droplets impacting on leaf surfaces was studied, using a uniform-size droplet generator to produce drops ranging from 63 to 545 μm diam. To observe the impaction of spray droplets more easily and to measure their velocity before and after impaction, high-speed motion photography (6000 frames/sec) was used. Rebound of spray droplets depends on the micro-structure of the target surface. Leaf surfaces of several crops and weeds reflected 63 to 545 μm diam water drops traveling at velocities less than velocities of drops delivered by po
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Yang, Lin, and Rajiv Shivpuri. "A Water Evaporation Based Model for Lubricant Dryoff on Die Surfaces Heated Beyond the Leidenfrost Point." Journal of Manufacturing Science and Engineering 129, no. 4 (2007): 717–25. http://dx.doi.org/10.1115/1.2738126.

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Lubricants in hot forging are applied to the heated die surface by spraying dilute water based graphite suspensions through high-pressure nozzles. To avoid undesirable steam formation, these lubricant droplets need to completely dry before deformation begins. This paper presents an analytical model to estimate evaporation time for the impacting drops at surface temperatures above Leidenfrost, 300–450°C. It is based on the suspension of deformed droplet on a vapor cushion sustained by a continuous supply of water from the drying droplet. Model predictions are validated by single droplet experim
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Dissertations / Theses on the topic "Water Droplets Impacting"

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Dhiman, Rajeev. "Splashing and Breakup of Droplets Impacting on a Solid Surface." Thesis, 2009. http://hdl.handle.net/1807/17753.

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Two new mechanisms of droplet splashing and breakup during impact have been identified and analyzed. One is the internal rupture of spreading droplet film through formation of holes, and the other is the splashing of droplet due to its freezing during spreading. The mechanism of film rupture was investigated by two different methods. In the first method, circular water films were produced by directing a 1 mm diameter water jet onto a flat, horizontal plate for 10 ms. In the second method, films were produced by making 0.6 mm water droplets impact a solid surface mounted on the rim of a rotatin
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Gupta, Rahul. "Influence of Chemical Coating on Droplet Impact Dynamics." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3262.

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Dynamic behavior of impacting water drops on superhydrophobic solid surfaces provides important details on the stability/durability of such solid surfaces. Multi-scale surface roughness combined with a layer of low energy chemical is an essential surface modification process followed to create superhydrophobic capabilities on solid surfaces. The present work aims at studying the effect of low energy surface coating on droplet impact dynamics by carrying out experiments of water drop impacts on rough solid surfaces with and without chemical modification. A group of six aluminium alloy (Al6061)
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Gupta, Rahul. "Influence of Chemical Coating on Droplet Impact Dynamics." Thesis, 2016. http://hdl.handle.net/2005/3262.

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Dynamic behavior of impacting water drops on superhydrophobic solid surfaces provides important details on the stability/durability of such solid surfaces. Multi-scale surface roughness combined with a layer of low energy chemical is an essential surface modification process followed to create superhydrophobic capabilities on solid surfaces. The present work aims at studying the effect of low energy surface coating on droplet impact dynamics by carrying out experiments of water drop impacts on rough solid surfaces with and without chemical modification. A group of six aluminium alloy (Al6061)
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Khaled, Narimane. "High-Speed Imaging of a Water Droplet Impacting a Super Cold Surface." Thesis, 2016. http://hdl.handle.net/10754/618394.

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Frost formation is of a major research interest as it can affect many industrial processes. Frost appears as a thin deposit of ice crystals when the temperature of the surface is below the freezing point of the liquid. The objective of this research is to study icing with hope to propose new anti-icing and deicing methods. In the beginning of the research, cracking of the ice layer was observed when a deionized water droplet impacts a ?50 oC cooled sphere surface that is in contact with dry ice. To further investigate the cracks occurrence, multiple experiments were conducted. It was observed
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Conference papers on the topic "Water Droplets Impacting"

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Mitchell, B. R., A. Nassiri, M. R. Locke, J. C. Klewicki, Y. P. Korkolis, and B. L. Kinsey. "Experimental and Numerical Framework for Study of Low Velocity Water Droplet Impact Dynamics." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8874.

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Impacting water droplets are capable of eroding soil, rock, turbine blades and even high speed aircraft. Research has shown that high velocity water droplet impingement onto a solid workpiece can strip paint, remove rust, and serve as a machining operation. This technique is different from waterjet cutting as a train of water droplets are used to transport momentum to a workpiece rather than a continuous jet. Also, no abrasive medium is used which produces an environmentally friendly process. The exploitation of this water droplet impact phenomenon in industrial applications as a means to defo
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Hung, L. S., and S. C. Yao. "An Experimental Study of Droplets Impacting on Horizontal Screens." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0765.

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Abstract An experimental investigation of the water droplets impacting on horizontal wire screens at isothermal condition was conducted Mono-size droplets of 350 μm in diameter were generated using a piezoelectric droplet generator. For droplets impacting on coarse screens, they wetted the wires by forming thin liquid lumps. As these lumps of water film accumulated around the wires, dripping drops were produced on the bottom side of the wire. This phenomenon was very similar to the dripping drops from a single wire situation. For finer screens, the liquid film on the top surface permeated thro
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Sun, Lanxin, Qun Zheng, Mingcong Luo, Yijin Li, and Rakesh Bhargava. "Understanding Behavior of Water Droplets in a Transonic Compressor Rotor With Wet Compression." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23141.

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The process of wet compression in an axial compressor is an intricate two-phase flow involving not only heat and mass transfer processes but also droplet breakup and even formation of discontinuous water film on the blade surface and then breaking into droplets. The implementation of practical boundary conditions for water droplets on the blade surface is the key to the proper numerical simulation of the wet compression process. In this paper, the droplets-wall interactions are analyzed using the theory of spray wall impingement through two computational models for an isolated transonic compre
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Fujimoto, Hitoshi, Yu Shiotani, Albert Y. Tong, and Hirohiko Takuda. "Interaction Phenomena of Two Water Droplets Successively Impacting Onto a Solid Surface." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60815.

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This study is concerned with the deformation behaviors of two droplets impinging successively onto a solid. Photographic means is used to understand the physics of the interaction phenomena between the two droplets. Water droplets of diameters between 0.39 mm and 0.65 mm with impact velocities ranging from 2.0 to 5.0 m/s are examined. The temperature of the solid surface is set at 25, 300 and 500 °C. The effects of varying solid surface temperatures, impact velocities of droplets and time intervals between the successive discharges on the collision behavior of the two impinging droplets are st
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Blake, Joshua D., David S. Thompson, Dominik M. Raps, and Tobias Strobl. "Simulating the Freezing of Supercooled Water Droplets Impacting a Cooled Substrate." In 52nd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-0928.

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Deshpande, Abhijit, and Marcellin Zahui. "Acoustic Cloud Condensation Nuclei Counter." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79800.

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Analysis and simulation of an acoustic cloud condensation nuclei counter is presented. The instrument is capable of accurately counting the number of micro scale water droplets impacting a water surface. The sound produced underwater by the water droplets is determined when the droplets strike the water surface with an impact velocity equal to either their terminal or maximum velocity. First, the terminal velocities of the droplets are calculated using Stoke’s law and compared to measured velocities from Gunn and Kinzer. Then the maximum velocities that these droplets can sustain without break
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Derome, Dominique, Stephan Carl, Peter Vontobel, and Jan Carmeliet. "Adsorption and film forming of train of water droplets impacting porous stones." In 7th International Building Physics Conference. International Association of Building Physics (IABP), 2018. http://dx.doi.org/10.14305/ibpc.2018.be-2.01.

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Varanasi, Kripa K., Tao Deng, Ming F. Hsu, and Nitin Bhate. "Design of Superhydrophobic Surfaces for Optimum Roll-Off and Droplet Impact Resistance." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67808.

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We study the wetting behavior of water droplets on superhydrophobic arrays of lithographically fabricated square posts. To determine the droplet wetting state, we measure static contact angles and compare the results to predictions for equilibrium Cassie and Wenzel states. Surprisingly, we find that roll-off angles are minimized on surfaces expected to induce Wenzel-like wetting in equilibrium. We argue that droplets on these surfaces are metastable Cassie droplets whose internal Laplace pressure is insufficient to overcome the energy barrier required to completely wet the posts. These metasta
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Esmaeelpanah, J., A. Dalili, S. Chandra, J. Mostaghimi, H. C. Fan, and H. Kuo. "Interactions Between High-Viscosity Droplets Deposited on a Surface: Experiments and Simulations." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72068.

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A combined numerical and experimental investigation of coalescence of droplets of highly viscous liquids dropped on a surface has been carried out. Droplets of 87 wt% glycerin-in-water solutions with viscosity 110 centistokes were deposited sequentially in straight lines onto a flat, solid steel plate and droplet impact photographed. Impacting droplets spread on the surface until liquid surface tension and viscosity overcame inertial forces and the droplets recoiled, eventually reaching equilibrium. Droplet center-to-center distance was varied and droplet line length was measured from photogra
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Shen, Jian, James Liburdy, Deborah Pence, and Vinod Narayanan. "Single Droplet Impingment: Effect of Nanoparticles." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55192.

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This study focuses on the dynamics of water and nanofluids droplet surface impingement. Droplets are generated by a piezoelectric driven droplet generator. A high-speed-high-resolution camera is used to record droplets impacting on a smooth heated silicon surface. Droplet impact velocity, spreading diameter, spreading height and dynamic contact angle are measured by image processing. Results of water and nanofluids are compared to determine effects of nanoparticles on spreading dynamics. It is concluded that the nanofluids result in larger spreading rates, larger spreading diameters and an inc
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