Relevant bibliographies by topics / Droplet

Academic literature on the topic 'Droplet'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 July 2024

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Journal articles on the topic "Droplet"

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Theodorou, Nicolas T., Alexandros G. Sourais, and Athanasios G. Papathanasiou. "Simulation of Electrowetting-Induced Droplet Detachment: A Study of Droplet Oscillations on Solid Surfaces." Materials 16, no. 23 (November 23, 2023): 7284. http://dx.doi.org/10.3390/ma16237284.

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The electrowetting-induced detachment of droplets from solid surfaces is important for numerous applications in the fields of heat transfer and fluid mechanics. The forced oscillations of droplets on solid surfaces and their ability to detach are studied. In this study, the process is efficiently simulated by implementing a powerful methodology developed by our team. Our results agree with experiments showing that optimal detachment, in terms of actuation energy, is achieved when the application of voltage is synchronized with the spreading time of the droplet. Under these conditions, the droplet oscillates with a period close to that of a mirrored Rayleigh droplet. The relationship between the droplet’s oscillation period and its physical properties is examined. During voltage-droplet synchronization, the droplet’s ability to detach depends mostly on its contact angle, its viscosity, and the applied voltage. An energy analysis is also conducted, revealing how energy is supplied to the droplet by electrowetting-induced detachment.
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Yoon, Dong, Daiki Tanaka, Tetsushi Sekiguchi, and Shuichi Shoji. "Size-Dependent and Property-Independent Passive Microdroplet Sorting by Droplet Transfer on Dot Rails." Micromachines 9, no. 10 (October 11, 2018): 513. http://dx.doi.org/10.3390/mi9100513.

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A fully passive microdroplet sorting method is presented in this paper. On the rails with dot patterns, the droplets were sorted in different ways depending on their size. However, the effect of droplet properties on the threshold size of the sorting was eliminated. The droplet positions on two railways and the Laplace pressure of the droplets on the dot patterns allowed selective droplet transfer according to size. Different gaps between the rails altered the threshold size of the transfer. However, the threshold size was independent of the droplet’s surface tension and viscosity because the droplet transfer utilized only the droplet position and Laplace pressure without lateral flow to sort targets. This feature has a high potential for bio/chemical applications requiring categorization of droplet targets consisting of various mixtures as pre- or post-elements.
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Du, Lin, Yuxin Li, Jie Wang, Zijian Zhou, Tian Lan, Dalei Jing, Wenming Wu, and Jia Zhou. "Cost-Effective Droplet Generator for Portable Bio-Applications." Micromachines 14, no. 2 (February 17, 2023): 466. http://dx.doi.org/10.3390/mi14020466.

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The convenient division of aqueous samples into droplets is necessary for many biochemical and medical analysis applications. In this article, we propose the design of a cost-effective droplet generator for potential bio-chemical application, featuring two symmetric tubes. The new droplet generator revisits the relationship between capillary components and liquid flow rates. The size of generated droplets by prototype depends only on generator dimensions, without precisely needing to control external flow conditions or driving pressure, even when the relative extreme difference in flow rate for generating nL level droplets is over 57.79%, and the relative standard deviation (RSD) of the volume of droplets is barely about 9.80%. A dropper working as a pressure resource is used to verify the rapidity and robustness of this principle of droplet generation, which shows great potential for a wide range of droplet-based applications.
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Hasegawa, Koji, Ayumu Watanabe, Akiko Kaneko, and Yutaka Abe. "Coalescence Dynamics of Acoustically Levitated Droplets." Micromachines 11, no. 4 (March 26, 2020): 343. http://dx.doi.org/10.3390/mi11040343.

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The contactless coalescence of a droplet is of paramount importance for physical and industrial applications. This paper describes a coalescence method to be used mid-air via acoustic levitation using an ultrasonic phased array system. Acoustic levitation using ultrasonic phased arrays provides promising lab-on-a-drop applications, such as transportation, coalescence, mixing, separation, evaporation, and extraction in a continuous operation. The mechanism of droplet coalescence in mid-air may be better understood by experimentally and numerically exploring the droplet dynamics immediately before the coalescence. In this study, water droplets were experimentally levitated, transported, and coalesced by controlled acoustic fields. We observed that the edges of droplets deformed and attracted each other immediately before the coalescence. Through image processing, the radii of curvature of the droplets were quantified and the pressure difference between the inside and outside a droplet was simulated to obtain the pressure and velocity information on the droplet’s surface. The results revealed that the sound pressure acting on the droplet clearly decreased before the impact of the droplets. This pressure on the droplets was quantitatively analyzed from the experimental data. Our experimental and numerical results provide deeper physical insights into contactless droplet manipulation for futuristic lab-on-a-drop applications.
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Dembia, Christopher Lee, Yu Cheng Liu, and C. Thomas Avedisian. "AUTOMATED DATA ANALYSIS FOR CONSECUTIVE IMAGES FROM DROPLET COMBUSTION EXPERIMENTS." Image Analysis & Stereology 31, no. 3 (September 5, 2012): 137. http://dx.doi.org/10.5566/ias.v31.p137-148.

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A simple automated image analysis algorithm has been developed that processes consecutive images from high speed, high resolution digital images of burning fuel droplets. The droplets burn under conditions that promote spherical symmetry. The algorithm performs the tasks of edge detection of the droplet’s boundary using a grayscale intensity threshold, and shape fitting either a circle or ellipse to the droplet’s boundary. The results are compared to manual measurements of droplet diameters done with commercial software. Results show that it is possible to automate data analysis for consecutive droplet burning images even in the presence of a significant amount of noise from soot formation. An adaptive grayscale intensity threshold provides the ability to extract droplet diameters for the wide range of noise encountered. In instances where soot blocks portions of the droplet, the algorithm manages to provide accurate measurements if a circle fit is used instead of an ellipse fit, as an ellipse can be too accommodating to the disturbance.
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Lyu, Sijia, Varghese Mathai, Yujie Wang, Benjamin Sobac, Pierre Colinet, Detlef Lohse, and Chao Sun. "Final fate of a Leidenfrost droplet: Explosion or takeoff." Science Advances 5, no. 5 (May 2019): eaav8081. http://dx.doi.org/10.1126/sciadv.aav8081.

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When a liquid droplet is placed on a very hot solid, it levitates on its own vapor layer, a phenomenon called the Leidenfrost effect. Although the mechanisms governing the droplet’s levitation have been explored, not much is known about the fate of the Leidenfrost droplet. Here we report on the final stages of evaporation of Leidenfrost droplets. While initially small droplets tend to take off, unexpectedly, the initially large ones explode with a crack sound. We interpret these in the context of unavoidable droplet contaminants, which accumulate at the droplet-air interface, resulting in reduced evaporation rate, and contact with the substrate. We validate this hypothesis by introducing controlled amounts of microparticles and reveal a universal 1/3-scaling law for the dimensionless explosion radius versus contaminant fraction. Our findings open up new opportunities for controlling the duration and rate of Leidenfrost heat transfer and propulsion by tuning the droplet’s size and contamination.
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Widyatama, Arif, Akmal Irfan Majid, Teguh Wibowo, Deendarlianto Deendarlianto, and Samsul Kamal. "EXPERIMENTAL STUDY ON THE PHENOMENA ON THE SUCCESSIVE DROPLETS IMPACTING HOT COPPER SURFAC." Jurnal Penelitian Saintek 24, no. 2 (October 29, 2019): 129–42. http://dx.doi.org/10.21831/jps.v24i2.26923.

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This study was aimed at investigating the phenomena and interactions between water droplets and hot metal surfaces using an experimental method. In this study, the droplet was dropped from 50 mm from the top of the metal surface with a frequency of 8.5 droplets per second. The observed droplet diameter was 3.12 mm. The metal used was copper with a surface temperature between 110-240 ° C. High speed video camera with a speed of 2000 fps was used to record visual data. Then the image processing technique was applied to calculate the change in droplet diameter. The results show that at low temperatures, droplets tend to maintain their initial position of contact with fluctuating deformations. While at high temperatures, a bounce phenomenon occurs which results in collisions between droplets being imperfect. Visualization results can reveal the complete change in the droplet geometry in the form of spreading ratio and complete apex height. The temperature of 140° C is the initial transition area for phenomena that result in droplets has no contact with hot surfaces so that the process of heat transfer between surfaces is inhibited.STUDI EKSPERIMEN PADA FENOMENA SUCCESSIVE DROPLETS MENUMBUK PERMUKAAN TEMBAGA PANASPenelitian ini bertujuan untuk mempelajari fenomena dan interaksi antara tetesan air (droplet) dan permukaan logam panas dengan metode eksperimental. Pada penelitian ini, droplet dijatuhkan dari posisi 50 mm dari atas permukaan logam dengan frekuensi 8,5 droplet per detik. Diameter droplet yang diamati sebesar 3,12 mm. Logam yang digunakan adalah tembaga dengan temperatur permukaan di antara 110-240° C. High speed video camera dengan kecepatan 2000 fps digunakan untuk merekam data visual. Teknik image processing diaplikasikan untuk menghitung perubahan diameter droplet. Hasil penelitian menunjukkan bahwa pertama, pada temperatur rendah, droplet cenderung mempertahankan posisi awal kontak dengan perubahan bentuk yang fluktuatif. Kedua, temperatur tinggi, terjadi fenomena bouncing yang mengakibatkan tumbukan antar droplet menjadi tidak sempurna. Hasil visualisasi dapat mengungkap perubahan geometri droplet berupa spreading ratio dan apex height secara lengkap. Dari penelitian ini juga diketahui bahwa temperatur 140°C menjadi daerah transisi awal terjadinya fenomena yang mengakibatkan droplet tidak bersinggungan dengan permukaan panas sehingga proses perpindahan kalor antar permukaan terhambat.
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Choi, Woorak, and Sungchan Yun. "Behavior of Compound Materials on Superhydrophobic Cylinders: Effects of Droplet’s Size and Interface Angle." Korean Journal of Metals and Materials 62, no. 3 (March 5, 2024): 222–28. http://dx.doi.org/10.3365/kjmm.2024.62.3.222.

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Compound droplets can consist of two or more immiscible substances sharing an interface. Among such droplets, the low-viscosity component of Janus droplets can exhibit peculiar bouncing behavior on nonwettable surfaces. There have been recent advances in droplet control technologies, however the impact dynamics of droplets on complex surfaces, and strategies to control their behavior, have not been extensively studied. This study employs the volume of fluid method to analyze the effects of Janus droplet size and the initial interface angle on the dynamics of the two fluidic components in droplets on superhydrophobic cylinders. Janus droplets are composed of low-viscosity (W-) and high-viscosity liquid (G-component). The dynamic characteristics of Janus droplets are investigated as a function of Weber number (<i>We</i>), initial interface angle, the ratio of the droplet’s diameter to the cylinder’s diameter, and viscosity ratio (α). Numerical models provide a regime map of the separation ratio of Janus droplets based on We and α, and the influence of droplet size on asymmetric bouncing is discussed. This study also examines the threshold We at which separation begins after impact, varying with droplet size and α. In addition, the shape evolutions of the droplets are discussed for various initial interface angles to understand the bouncing behavior and separation efficiency. This study is expected to provide valuable strategies for controlling droplet behavior and separation in applications such as liquid purification, rheology, and solidification.
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Zhang, Yixin, Ruolin Dong, Honghui Shi, and Jinhong Liu. "Experimental Investigations on the Deformation and Breakup of Hundred-Micron Droplet Driven by Shock Wave." Applied Sciences 13, no. 9 (April 29, 2023): 5555. http://dx.doi.org/10.3390/app13095555.

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This study examines the process of a 240 µm droplet breakup under a shock wave through experiments using a double-pulse laser holographic test technique on a shock tube. The technique allowed for high-resolution data to be obtained at the micron-nanosecond level, including the Weber number distribution of deformation and breakup modes for droplets of different sizes and loads. Results were compared with larger droplets at the same Weber number, revealing that higher Weber numbers result in more difficulty in droplet breakup, longer deformation times, and increased deformation behavior. At low Weber numbers within the critical range, changes in droplet diameter affect the Rayleigh–Taylor waves and alter the droplet’s characteristics. The study also investigates the laws and reasons behind windward displacement variation for hundred-micron droplets at different Weber numbers over time.
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Ochowiak, Marek, Zdzisław Bielecki, Michał Bielecki, Sylwia Włodarczak, Andżelika Krupińska, Magdalena Matuszak, Dariusz Choiński, Robert Lewtak, and Ivan Pavlenko. "The D2-Law of Droplet Evaporation When Calculating the Droplet Evaporation Process of Liquid Containing Solid State Catalyst Particles." Energies 15, no. 20 (October 16, 2022): 7642. http://dx.doi.org/10.3390/en15207642.

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The review presents the D2-law of droplet evaporation, which is used to describe the spraying process involving the evaporation of droplets. This law, the subject of numerous publications, can be successfully applied to describe the droplet evaporation process under various conditions, including the calculations of the process of feeding the boiler with a liquid that contains catalyst particles. To date, not a lot of work has been devoted to this issue. The paper is a continuation of previous research concerning the spraying of liquids with a catalyst, which improves the efficiency of the process. The conducted analysis showed that the experimental data from previously published work are very compatible with the data obtained from the D2-law of droplet evaporation. At the standard speed of about 20 m/s of an aerosol flowing through a dust duct, droplets in the stream should be observed up to a distance of 1 m from the outlet of the apparatus supplying the system. Under such flow conditions, a droplet’s lifetime must be above 0.05 s. The dependence between a droplet’s lifetime and its diameter and temperature was determined. The obtained results confirmed that the effective droplet diameter is above 30 µm. Such droplets must be generated and then fed to the boiler for the catalyst to work properly. This law is an engineering approach to the problem, which uses relatively simple model equations in order to determine the evaporation time of a droplet.
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Dissertations / Theses on the topic "Droplet"

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Umapathi, Udayan. "Droplet IO : programmable droplets for human-material interaction." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/114062.

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Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 87-93).
In this thesis, I propose aqueous droplets as a form of programmable material that can computationally transform its physical properties. Liquid matter can undergo physical transformation through interfacial forces and surface tension. I introduce a system called DropletIO to regulate interfacial forces through a programmable electric field. The system can actuate and sense macro-scale (micro-liter to milli-liter) droplets on arbitrary planar and curved surfaces. The system can precisely move, merge, split, and change shape of droplets and thus enables a range of applications with human interactivity, information displays, parallelized programmable chemistry and dynamically tunable optics. DropletIO system uses electrowetting on dielectric (EWOD) to manipulate droplets. EWOD is a physical phenomenon where a polar droplet on a dielectric surface is attracted to a charged electrode. I constructed EWOD arrays with integrated actuation and sensing on inexpensive printed circuit boards that can scale to arbitrarily large areas and different form factors. Additionally, in this thesis I discuss how semiconductor device scaling applies to electrowetting for smaller volume droplets and hence miniaturized programmable lab-on-a-chip. Droplet based microfluidics is extensively used in biology and chemistry. In this thesis I describe two novel fluid manipulation mechanism for microfluidics. First, I show an approach for splitting aqueous droplets on an open digital microfluidic platform and thus a system capable of performing a complete set of microfluidic operations on an open surface. Second, I demonstrate how electrowetting platforms can handle large volume fluids, and hence enable a new direction in programmable fluid handling called digital millifluidics.
by Udayan Umapathi.
S.M.
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Sahu, Sucharita. "Thermal state of Sn-Pb droplets in the droplet-based manufacturing process." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34081.

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Caën, Ouriel. "Droplet microfluidics for cancer cell evolution Parallelized ultra-high throughput microfluidic emulsifier for multiplex kinetic assays Counting single cells in droplets Multiplexed droplet sorting." Thesis, Sorbonne Paris Cité, 2016. https://wo.app.u-paris.fr/cgi-bin/WebObjects/TheseWeb.woa/wa/show?t=1888&f=11697.

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Cette thèse porte sur une problématique moderne: la prise en charge de patients cancéreux par thérapie ciblée. De tels traitements sont efficaces et représentent une récente avancée thérapeutique majeure pour des patients multi-traités en cas d'échec thérapeutique. Cependant, les réponses des patients sont souvent transitoires puisqu'ils rechutent plusieurs mois après le traitement. Il a été récemment démontré que pour les cancers du poumon, ces rechutes sont associées à l'émergence de nouvelles altérations génétiques au sein des tumeurs. Il est donc important de discriminer avant traitement le processus de résistance qui pourrait se produire et proposer ainsi la combinaison de traitements qui empêcheraient l'apparition d'une résistance. Une telle évaluation précoce pourrait être facilitée grâce à l'utilisation de la microfluidique de goutte qui permet un criblage à haut débit à l’échelle de la cellule unique. Cette technologie pourrait ainsi devenir un outil générique pour identifier la résistance à un traitement à un stade précoce de son développement. Dans le cadre de cette thèse, nous avons utilisé comme modèle in vitro des lignées cellulaires NSCLC (Non-Small Cell Lung Cancer) respectivement sensibles et résistantes au traitement. Nous avons développé de nouveaux outils de microfluidique de goutte qui ont permis de discriminer entre le phénotype et le génotype de cellules uniques sensibles au traitement et résistantes au traitement. Une telle preuve de principe constitue une première étape vers la compréhension de l'hétérogénéité de populations de cellules tumorales, dont il a été montré qu’elle est corrélée avec la résistance aux thérapies
This thesis deals with a modern problematic: the management of cancer patients using targeted therapy. Such treatments are efficient and represent a recent major therapeutic advance for multi-treated patients in therapeutic failure. However patients responses are often transitory as they relapse several months following the treatment. It has been recently demonstrated that for lung cancers these escapes are associated with the emergence of new genetic alterations within tumors. It is thus important to discriminate before treatment the resistance process that could occur and thus propose the therapeutic combination of treatments that would prevent the appearing of a resistance. Such early assessment could be eased-up thanks to the use of droplet microfluidics which allows high-throughput screening at a single-cell level resolution. This technology could hence become a generic tool to identify resistance to a treatment in an early stage of its development. In the framework of this thesis we used as an in vitro model treatment-sensitive and treatment-resistant NSCLC (Non-Small Cell Lung Cancer) cell lines. We developed novel droplet microfluidics tools which allowed to discriminate between the phenotype and genotype of single treatment-sensitive and treatment-resistant single cells. Such a proof of principle constitutes a first step towards the understanding of tumor cell population heterogeneity, which has been shown to be correlated with resistance to therapies
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Ciobanescu, Husanu Irina N. Choi Mun Young Ruff Gary A. "Droplet interactions during combustion of unsupported droplet clusters in microgravity : numerical study of droplet interactions at low reynolds number /." Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/729.

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You, David, and Jeong-Yeol Yoon. "Droplet centrifugation, droplet DNA extraction, and rapid droplet thermocycling for simpler and faster PCR assay using wire-guided manipulations." BioMed Central, 2012. http://hdl.handle.net/10150/610171.

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A computer numerical control (CNC) apparatus was used to perform droplet centrifugation, droplet DNA extraction, and rapid droplet thermocycling on a single superhydrophobic surface and a multi-chambered PCB heater. Droplets were manipulated using "wire-guided" method (a pipette tip was used in this study). This methodology can be easily adapted to existing commercial robotic pipetting system, while demonstrated added capabilities such as vibrational mixing, high-speed centrifuging of droplets, simple DNA extraction utilizing the hydrophobicity difference between the tip and the superhydrophobic surface, and rapid thermocycling with a moving droplet, all with wire-guided droplet manipulations on a superhydrophobic surface and a multi-chambered PCB heater (i.e., not on a 96-well plate). Serial dilutions were demonstrated for diluting sample matrix. Centrifuging was demonstrated by rotating a 10 muL droplet at 2300 round per minute, concentrating E. coli by more than 3-fold within 3min. DNA extraction was demonstrated from E. coli sample utilizing the disposable pipette tip to cleverly attract the extracted DNA from the droplet residing on a superhydrophobic surface, which took less than 10min. Following extraction, the 1500bp sequence of Peptidase D from E. coli was amplified using rapid droplet thermocycling, which took 10min for 30cycles. The total assay time was 23min, including droplet centrifugation, droplet DNA extraction and rapid droplet thermocycling. Evaporation from of 10 muL droplets was not significant during these procedures, since the longest time exposure to air and the vibrations was less than 5min (during DNA extraction). The results of these sequentially executed processes were analyzed using gel electrophoresis. Thus, this work demonstrates the adaptability of the system to replace many common laboratory tasks on a single platform (through re-programmability), in rapid succession (using droplets), and with a high level of accuracy and automation.
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Abel, Godard Karl. "Characterization of droplet flight path and mass flux in droplet-based manufacturing." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12047.

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Vukasinovic, Bojan. "Vibration-induced droplet atomization." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17237.

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James, Ashley Jean. "Vibration induced droplet ejection." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17337.

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Pacitti, Antony Gerard. "Droplet motion in flames." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421855.

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Wilkins, Jonathan Hugh. "Droplet impingement onto surfaces." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298261.

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Books on the topic "Droplet"

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Ren, Carolyn, and Abraham Lee, eds. Droplet Microfluidics. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781839162855.

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Bürkholz, Armin. Droplet separation. Weinheim (Federal Republic of Germany): VCH Verlagsgesellschaft, 1989.

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Tournier, Michel. The golden droplet. New York: Doubleday, 1987.

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The golden droplet. London: Collins, 1987.

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United States. National Aeronautics and Space Administration, ed. Effects of droplet interactions on droplet transport at intermediate Reynolds numbers. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Grimmer, Andreas, and Robert Wille. Designing Droplet Microfluidic Networks. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-20713-7.

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Parmar, Tavisha. The little water droplet. Gurgaon, India: Vivera Books, 2005.

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Lamanna, Grazia, Simona Tonini, Gianpietro Elvio Cossali, and Bernhard Weigand, eds. Droplet Interactions and Spray Processes. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33338-6.

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Roberts, I. D. Droplet evaporation from porous surfaces. Manchester: UMIST, 1995.

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White, K. Alan. Liquid droplet radiator development status. [Washington, D.C.]: National Aeronautics and Space Administration, 1987.

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Book chapters on the topic "Droplet"

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Henkel, Thomas. "Droplet Fusion and Droplet Loading." In Encyclopedia of Microfluidics and Nanofluidics, 667–75. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_1731.

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Henkel, Thomas. "Droplet Fusion and Droplet Loading." In Encyclopedia of Microfluidics and Nanofluidics, 1–10. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-3-642-27758-0_1731-1.

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Bhutani, Gaurav, K. Muralidhar, and Sameer Khandekar. "Droplet Statics." In Mechanical Engineering Series, 3–39. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48461-3_1.

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Guraya, Sardul S. "Cytoplasmic Droplet." In Biology of Spermatogenesis and Spermatozoa in Mammals, 252–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71638-6_10.

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Lindemann, Timo, and Roland Zengerle. "Droplet Dispensing." In Encyclopedia of Microfluidics and Nanofluidics, 641–52. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_361.

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Schönfeld, Friedhelm. "Droplet Evaporation." In Encyclopedia of Microfluidics and Nanofluidics, 660–67. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_364.

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Nguyen, Nam-Trung. "Droplet Microreactor." In Encyclopedia of Microfluidics and Nanofluidics, 675–80. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_373.

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Brenn, G. "Droplet Collision." In Handbook of Atomization and Sprays, 157–81. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-7264-4_7.

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Tadros, Tharwat. "Droplet Removal." In Encyclopedia of Colloid and Interface Science, 338–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_69.

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Piacentini, Emma. "Droplet Size." In Encyclopedia of Membranes, 591–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_1690.

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Conference papers on the topic "Droplet"

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Lee, Beomjoon, and Jung Yul Yoo. "Droplet Traffic Control in Microchannel by Droplet Bistability." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-36008.

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This paper presents novel methods for precisely controlling water droplets by use of a microfluidic bifurcation channel with outlet restrictions, based on droplet bistability which utilizes the Laplace pressure due to interfacial tension arising when a droplet encounters a narrow restriction. We implement droplet bistable geometry, which has two symmetric branches and restrictions, to operate as capillary valves, so that a droplet can be trapped in front of a restriction and released through it when the next droplet arrives at the other restriction. It is observed that this trap-and-release occurs repeatedly and regularly by the succeeding droplets. It is also found that there is a critical flow rate to achieve droplet bistability which occurs only when the apparent Laplace pressure surpasses the pressure drop across the droplet. By adopting a simplified hydrodynamic resistance model, droplet bistable mechanism is clearly explained. Droplet bistability enables simple and precise control of droplets at a bifurcation channel. Thus, by an appropriate channel design to induce droplet bistability, precise control of droplet traffic is achieved at a bifurcation channel connected with a single inlet channel and two outlet channels. In particular, we are able to distribute droplets at a junction in a manner of perfect alternation between the two outlet channels. Bistable components can be used as an elaborately embedded droplet traffic signal for red light (trap) and green light (release) in complex microfluidic devices, where droplets provide both the chemical or biological materials and the processing signal.
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Dehghani-Sanij, Alireza, Greg F. Naterer, Yuri S. Muzychka, and Kevin Pope. "Thermal Analysis of Saline Droplet Motion With Cooling in Cold Regions." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61097.

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In this paper, a theoretical approach is employed to analyze the thermal behaviour and study the cooling process of water droplets in cold regions. Additionally, the effect of several parameters, such as air temperature, droplet size, initial droplet temperature, relative humidity and droplet salinity on the cooling process is investigated. The model contains convection, evaporation, and radiation heat transfer from the droplet’s surface and a uniform temperature across the droplet. The results illustrate a good agreement between the theoretical predictions and previously measured data. Furthermore, droplet size, air temperature, initial droplet temperature, and droplet flight time have a substantial effect on the droplet cooling process. This model is a useful tool to investigate the thermal behaviour and the cooling process of water droplets.
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Mesa, Bianca. "The Study of a Liquid Droplet Falling Through Two Immiscible Layers of Liquids." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66126.

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In an exploratory experiment, we noticed the unusual behaviors of liquid droplets falling through layers of oil and water. A rectangular container was filled with an aqueous solution at the bottom and a layer of oil on top. A dropper was used to control the size of the droplet entering the liquid column. In addition, water was mixed with a small amount of Bromothymol Blue dye, a chemical indicator, to visualize the detailed flow processes. It was noticed that initially, the liquid droplet moved through the oil layer and was stopped at the oil/water interface, supported by surface tension and the buoyancy of the oil layer between the liquid droplet and the water below. As time passed, the support was weakened and the droplet would start to fall quickly through the water. Two types of droplets were used. The first case was a salt water solution with NaOH, and the second consisted of balsamic vinegar and NaOH. As soon as the salt water droplet touched the aqueous solution, it collapsed and sank as well as spread rapidly at the interface. The sinking motion eventually dragged the spreading fluid back to its center and then down. For the balsamic vinegar case, a trace amount of the droplet spread rapidly at the interface while the main portion of the droplet would first sink and then spontaneously explode. The difference in behavior is mainly due to the surface tension of the droplet in water. The underlying mechanisms of the droplet’s flow instability are from the effects of diffusion weakening the surface tension.
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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 photographs. As droplet spacing was increased there was less interaction between the droplets. A three dimensional parallel code has been developed to simulate fluid flow and free surface interaction by solving the continuity, momentum and volume-of-fluid (VOF) equations. The two-step projection method was employed to solve the governing equations for the whole domain including both liquid and air phases. The continuum-surface-force (CSF) scheme was applied to model surface tension and the piecewise-linear-interface-construction (PLIC) technique used to reconstruct the free surface. Computer generated images of impacting droplets modeled droplet shape evolution correctly and compared well with photographs taken during experiments. Accurate predictions were obtained for droplet line length during spreading and at equilibrium.
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Mansouri, A., H. Arabnejad, and R. S. Mohan. "Numerical Investigation of Droplet-Droplet Coalescence and Droplet-Interface Coalescence." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21642.

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The oil produced from offshore reservoirs normally contains considerable amount of water. The separation of water from oil is very crucial in petroleum industry. Studying the coalescence of two droplets or one droplet and interface can lead to better understanding of oil-water separation process. In this study, the coalescence of two droplets and droplet-interface are simulated using a commercial Computational Fluid Dynamics (CFD) code FLUENT 14. In order to track the interface of two fluids, two approaches, Volume of Fluid (VOF) and Level-Set method were utilized. The results are compared with experimental measurements in literature and good agreement was observed. The effect of different parameters such as droplet velocities, interfacial tension, viscosity of the continuous phase and off-center collision on the coalescence time has been investigated. The results revealed that coalescence time decreases as the droplet velocities increase. Also, continuous phase with higher viscosities and lower water-oil interfacial tension, increase the coalescence time.
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Akhtar, Mahmuda, M. Towshif Rabbani, and Michael J. Vellekoop. "Merging of droplets in micro-channel independent of the droplet size and inter-droplet separation." In SPIE Microtechnologies, edited by Sander van den Driesche. SPIE, 2015. http://dx.doi.org/10.1117/12.2178508.

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Traipattanakul, B., C. Y. Tso, and Christopher Y. H. Chao. "Study of Electrostatic-Induced Jumping Droplets on Superhydrophobic Surfaces." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70311.

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Condensation of water vapor is an important process utilized in energy/thermal/fluid systems. When droplets coalesce on the non-wetting surface, excess surface energy converts to kinetic energy leading to self-propelled jumping of merged droplets. This coalescing-jumping-droplet condensation can better enhance heat transfer compared to classical dropwise condensation and filmwise condensation. However, the resistance force can cause droplets to return to the surface. These returning droplets can either coalesce with neighboring droplets and jump again, or adhere to the surface. As time passes, these adhering droplets can become larger leading to progressive flooding on the surface, limiting heat transfer performance. However, an electric field is known to be one of the effective methods to prevent droplet return and to address the progressive flooding issue. Therefore, in this study, an experiment is set up to investigate the effects of applied electrical voltages between two parallel copper plates on the jumping height with respect to the droplet radius and to determine the average charge of coalescing-jumping-droplets. Moreover, the gravitational force, the drag force, the inertia force and the electrostatic force as a function of the droplet radius are also discussed. The gap width of 7.5 mm and the electrical voltages of 50 V, 100 V and 150 V are experimentally investigated. Droplet motions are captured with a high-speed camera and analyzed in sequential frames. The results of the study show that the applied electrical voltage between the two plates can reduce the resistance force due to the droplet’s inertia and can increase the effects of the electrostatic force. This results in greater jumping heights and the jumping phenomenon of some bigger-sized droplets. With the same droplet radius, the greater the applied electrical voltage, the higher the coalescing droplet can jump. This work can be utilized in several applications such as self-cleaning, thermal diodes, anti-icing and condensation heat transfer enhancement.
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Protheroe, Michael D., and Ahmed M. Al-Jumaily. "Ultrasound Effect on Droplet Evaporation." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50552.

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This paper investigates the effect of an ultrasound field on the evaporation of water droplets into an air stream flowing along a conduit. The air and droplet mixture (aerosol) is passed through an intense ultrasound field, generated in a cylindrical sonotrode, in an effort to accelerate the droplet evaporation process. The improvement in droplet evaporation was evaluated by measuring changes in the droplet size distribution and changes to the air humidity and temperature. It was found that at high power levels the droplets were rapidly and completely vaporized. At power levels in the 2–20 W range there was a significant increase in droplet evaporation, up to 28%, but also some droplet coalescence occurred. The mechanism for this improvement was thought to be a result of enhanced convection heat and mass transfer processes and the input of heat energy into the aerosol. This study has demonstrated that an ultrasound field does improve water droplet evaporation.
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Yan, Run, and Chung-Lung (C L. ). Chen. "Condensation Droplet Distribution Affected by Electrowetting Approach." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-3982.

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Abstract This paper presents a visualization of condensation droplet distribution affected by the electrowetting-on-dielectric (EWOD) approach. A single-side double-layer-electrode design (grid wire, thin wire, and thick wire) and coplanar-electrode design (zigzag) are discussed. Side-by-side experiments with applied 40V DC electric potential are carried out to compare droplet distribution between charged and uncharged devices with the identical design. The uncharged devices show a random droplet distribution, whereas charged devices have a regulated distribution based on the designed patterns. As droplets on the electrode boundaries become larger, they are likely to slide away and stay in electrode-free regions. The droplets ‘sit’ inside the grid wires and distribute vertically along thin and thick wires. On the coplanar-electrode zigzag device, droplets cover the electrode gaps and are distributed vertically. The charged surfaces lead to a faster droplet growth rate, resulting in larger droplet size and more dispersed droplet distribution. This phenomenon accelerates droplets’ shedding frequency and frees up more condensing areas for small droplets to nucleate and grow. The first shedding moment of the charged surfaces occurs earlier than the uncharged ones for all types of EWOD devices. The detected droplet shedding diameter ranges from 1.2 mm to 2 mm in this study. The work presented in this paper introduces a novel approach to actively influence droplet distribution on microfabricated condensing surfaces and indicates great potential for improving condensation heat transfer rate via EWOD.
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Rehman, Hafiz Laiq-ur, Abdelouahab Mohammed-Taifour, Julien Weiss, and Patrice Seers. "PLIF Experiments on Evaporating Isolated Droplet and Droplets Array." In 46th AIAA Thermophysics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4311.

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Reports on the topic "Droplet"

1

Liaw, Steven. Droplet Based Microfluidics. Office of Scientific and Technical Information (OSTI), July 2014. http://dx.doi.org/10.2172/1148311.

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Blue, C. A., V. K. Sikka, Jung-Hoon Chun, and T. Ando. Uniform-droplet spray forming. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/494112.

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Grisso, Robert. Droplet Chart / Selection Guide. Blacksburg, VA: Virginia Cooperative Extension, August 2019. http://dx.doi.org/10.21061/442-031_bse-263p.

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Wollman, Andrew. Capillarity-Driven Droplet Ejection. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.563.

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Sivathanu, Yudaya, Harsh P. Oke, Chunming Fu, and Paul E. Sojka. Droplet Interaction with Hot Surfaces. Fort Belvoir, VA: Defense Technical Information Center, January 1999. http://dx.doi.org/10.21236/ada379895.

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Riihimaki, L., S. McFarlane, and C. Sivaraman. Droplet Number Concentration Value-Added Product. Office of Scientific and Technical Information (OSTI), June 2014. http://dx.doi.org/10.2172/1237963.

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Hudson, James G. Cloud Supersaturations and Droplet Spectral Width. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1414944.

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Law, Chung K. Droplet Collision in Liquid Propellant Combustion. Fort Belvoir, VA: Defense Technical Information Center, August 1997. http://dx.doi.org/10.21236/ada329722.

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Miller, Roger E. Superfluid Helium Droplet Spectroscopy Equipment Development. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada413202.

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Hardalupas, Yannis. Planar Droplet Sizing in Dense Sprays. Fort Belvoir, VA: Defense Technical Information Center, April 2013. http://dx.doi.org/10.21236/ada583405.

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