Academic literature on the topic 'Air-droplet flow'

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Journal articles on the topic "Air-droplet flow"

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Mohammadi, Morteza, Sara Moghtadernejad, Percival J. Graham, and Ali Dolatabadi. "Dynamic Impact Behavior of Water Droplet on a Superhydrophobic Surface in the Presence of Stagnation Flow." Applied Mechanics and Materials 232 (November 2012): 267–72. http://dx.doi.org/10.4028/www.scientific.net/amm.232.267.

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The following study investigates splashing of impinging water droplets on superhydrophobic surfaces with and without the presence of a stagnation flow. Droplets were accelerated by either gravity or gravity and co-flow. By changing the height and the air flow velocity different combinations of stagnation flow and droplet velocity were created. The spreading diameter, spreading velocity and contact time were studied for different air and droplet speeds. It was clearly observed that for a fixed impact velocity (i.e. constant Weber number), the presence of the stagnation flow promotes splashing a
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BIKNIENĖ, Kristina, and Linas PAUKŠTAITIS. "Averaged Heat Fluxes Densities During Condensation and Evaporation of a Water Droplet." Mechanics 30, no. 2 (2024): 150–58. http://dx.doi.org/10.5755/j02.mech.35522.

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This study is intended for experimental investigation of the influence of boundary conditions on the intensity of phase transformations and heat transfer processes in a suspended water droplet. The results of the dynamics of the averaged heat fluxes densities during the droplet phase change cycle are presented and analysed. The influence of the droplet initial temperature, the surrounding air flow temperature and the additional humidity in the air flow were defined in separate regimes of the droplet phase transformations cycle. The experiments performed demonstrated that the parameters of the
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Kumar, Deepak, Tushar Sikroria, Kushari A, Pramod Kumar, and Sriganesh G. "A twin-fluid injector for FCC feed injection." International Journal of Petrochemical Science & Engineering 4, no. 3 (2019): 109–15. http://dx.doi.org/10.15406/ipcse.2019.04.00110.

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In Fluidized Bed Catalytic Cracking (FCC) process, hydrocarbon feed undergoes vapour phase cracking in presence of hot regenerated catalyst to produce valuable products like LPG, Gasoline and Diesel. FCC feed injection system is most critical hardware component of FCC unit in order to get desired product yield by minimizing the undesirable dry gas and coke yield. Typically, twin-fluid nozzles (hydrocarbon and stream) are used to atomize the feed. In the present study, a twin-fluid injector, with an internal impactor to minimize the droplet size and velocity, is designed, developed and characte
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Kumar, Deepak, Tushar Sikroria, Kushari A, Pramod Kumar, and Sriganesh G. "A twin-fluid injector for FCC feed injection." International Journal of Petrochemical Science & Engineering 4, no. 3 (2019): 109–15. http://dx.doi.org/10.15406/ipcse.2019.04.00110.

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In Fluidized Bed Catalytic Cracking (FCC) process, hydrocarbon feed undergoes vapour phase cracking in presence of hot regenerated catalyst to produce valuable products like LPG, Gasoline and Diesel. FCC feed injection system is most critical hardware component of FCC unit in order to get desired product yield by minimizing the undesirable dry gas and coke yield. Typically, twin-fluid nozzles (hydrocarbon and stream) are used to atomize the feed. In the present study, a twin-fluid injector, with an internal impactor to minimize the droplet size and velocity, is designed, developed and characte
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Hasegawa, Mitsugu, Katsuaki Morita, Hirotaka Sakaue, and Shigeo Kimura. "Pinned Droplet Size on a Superhydrophobic Surface in Shear Flow." Aerospace 7, no. 3 (2020): 34. http://dx.doi.org/10.3390/aerospace7030034.

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The recent development of a superhydrophobic surface enhances the droplet shedding under a shear flow. The present study gives insights into the effects of shear flow on a pinned droplet over a superhydrophobic surface. To experimentally simulate the change in the size of a sessile droplet on an aerodynamic surface, the volume of the pinned droplet is expanded by water supplied through a pore. Under a continuous airflow that provides a shear flow over the superhydrophobic surface, the size of a pinned water droplet shed from the surface is experimentally characterized. The air velocity ranges
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Druzhinin, Oleg A., and Wu-Ting Tsai. "Investigation of Vortex Structure Modulation by Spume Droplets in the Marine Atmospheric Boundary Layer by Numerical Simulation." Journal of Marine Science and Engineering 10, no. 7 (2022): 856. http://dx.doi.org/10.3390/jmse10070856.

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Direct numerical simulation (DNS) of a droplet-laden, turbulent Couette airflow over a waved water surface is performed modeling the marine atmospheric boundary (MABL) layer carrying idealized spume droplets. Both the instantaneous and mean flow properties, the characteristics of the vortex structures and the momentum exchange between air turbulence and waved water surface and droplet-mediated momentum transfer are investigated. A Eulerian–Lagrangian approach is employed in DNS where full, 3D Navier–Stokes equations for the carrier air are solved in a Eulerian frame, and the trajectories of in
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Jiang, Feng, Weilin Xu, Jun Deng, and Wangru Wei. "Flow Structures of the Air-Water Layer in the Free Surface Region of High-Speed Open Channel Flows." Mathematical Problems in Engineering 2020 (November 3, 2020): 1–10. http://dx.doi.org/10.1155/2020/5903763.

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In hydraulic engineering, intense free surface breakups have been observed to develop in high-speed open channel flows, resulting in a mixed air-water layer near the free surface that grows with the development of self-aeration. This region is characterized by a substantial number of droplets coexisting with an induced air layer above. Little information about this droplet layer is currently available and no practicable approach has been proposed for predicting the parameters of the induced air layer based on the related flow structures in the droplet layer. In this research, laboratory experi
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Asmuin, Nor Zelawati. "Design for Two-Fluid Fine Nozzle with 50% Fill Ratio." Applied Mechanics and Materials 773-774 (July 2015): 387–92. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.387.

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Sufficient air insert by reduced liquid in flashing propellants are required to produce fine droplet size with symmetrical spray in an aerosol atomiser without swirling design. It is called novel matched valve-actuator with two-fluid fine nozzle. Two-fluid fine nozzle design is an arrangement between air-assist atomiser insert, air blast and effervescent atomiser insert. However, 50% fill ratio and 9bar on pressure can with a currently acceptable become “Benchmark Objective” in this research. The results shows a few measurement with the same volume flow rate and variable flow rate of two fluid
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KUROSE, RYOICHI, AKITOSHI FUJITA, and SATORU KOMORI. "Effect of relative humidity on heat transfer across the surface of an evaporating water droplet in air flow." Journal of Fluid Mechanics 624 (April 10, 2009): 57–67. http://dx.doi.org/10.1017/s0022112009005862.

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A three-dimensional direct numerical simulation (DNS) is applied to flows inside and outside an evaporating spherical water droplet in air, and the effect of relative humidity on the heat transfer between the droplet and ambient air is investigated. The initial air temperature is set to be 15 K higher than the initial droplet temperature. The results show that the local evaporation heat loss indicates the maximum on the front of the droplet and decreases on going from the front to the rear, and the reduction on the rear becomes marked for high-droplet Reynolds numbers. This is because the evap
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Campos, Javier, Heping Zhu, Hongyoung Jeon, et al. "Air-Pinch PWM Valve to Regulate Flow Rate of Hollow-Cone Nozzles for Variable-Rate Sprayers." Journal of the ASABE 66, no. 5 (2023): 1317–29. http://dx.doi.org/10.13031/ja.15601.

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Highlights Air-pinch PWM valve was investigated as an alternative to electric PWM valves to manipulate hollow-cone nozzles. Air-pinch and electric PWM valves performed comparable accuracy in flow rate modulations. Droplet sizes from hollow-cone nozzles with both PWM valves were comparable across DUCs ranging from 20% to 100%. Air-pinch PWM valve had great potential of use due to its capacity to isolate the internal parts of the valve from chemicals. Abstract. Electric pulse width modulation (PWM) solenoid valves are commonly used to regulate nozzle flow rates to achieve precision variable-rate
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Dissertations / Theses on the topic "Air-droplet flow"

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Fujimoto, Hitoshi. "Flow fields of air-liquid droplet two-phase mixture and collision dynamics of a droplet on a surface." Kyoto University, 1995. http://hdl.handle.net/2433/160775.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(工学)<br>乙第8868号<br>論工博第2977号<br>新制||工||996(附属図書館)<br>UT51-95-D461<br>(主査)教授 八田 夏夫, 教授 鈴木 健二郎, 教授 赤松 映明<br>学位規則第4条第2項該当
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Esposito, Angelo. "Numerical and Experimental Study of Droplet-Air Flow Interaction on the GDL Surface of PEMFC for Water Management Monitoring, Control and Diagnostics." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1274977066.

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Yoon, Suck Ju. "Contribution a l'etude de la diffusion avec transfert de masse de gouttelettes dans un ecoulement gazeux turbulent." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13070.

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Etude de la diffusion et de l'evaporation d'un liquide (freon) injecte sous forme de gouttelettes dans un ecoulement d'air turbulent. Mesures de vitesse et de taille des particules par des methodes optiques non intrusives
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Montello, Aaron David. "An Experimental Investigation of Water Droplet Growth, Deformation Dynamics and Detachment in a Non-Reacting PEM Fuel Cell via Fluorescence Photometry." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228248650.

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Davoudi, Masoume. "Aerosol Droplet Migration in Fibrous Media." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1509120181801687.

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Gai, Guodong. "Modeling of water sprays effects on premixed hydrogen-air explosion, turbulence and shock waves Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray Numerical study on laminar flame velocity of hydrogen-air combustion under water spray effects Modeling of particle cloud dispersion in compressible gas flows with shock waves A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves Particles-induced turbulence: a critical review of physical concepts, numerical modelings and experimental investigation A new methodology for modeling turbulence induced 1 by a particle-laden flow using a mechanistic model." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR14.

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Cette thèse de doctorat est dédiée au développement de modèles physiques pour l’étude des systèmes d’aspersion de gouttelettes d’eau en milieu réactif d’hydrogène-air pré-mélangée dans les centrales nucléaires. Des modèles d’ordre réduit sont développés pour décrire l’évaporation des gouttelettes d’eau dans la flamme, la dispersion des nuages de particules après le passage des ondes de choc et l’évolution de l’échelle caractéristiques de turbulence avec la présence d’un jet d’eau. Une nouvelle méthodologie est proposée pour évaluer les effets de l’évaporation par l’aspersion sur la propagation
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Boháček, Jan. "EFFECT OF FLOW PARAMETERS OF WATER AND AIR ATOMIZED SPRAYS ON COOLING INTENSITY OF HOT SURFACES." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-233959.

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Práce komplexně popisuje vodní a vodovzdušné chlazení pomocí metod CFD (Computational Fluid Dynamics) konkrétně s využitím software ANSYS FLUENT. Skládá se ze dvou hlavních částí, z nichž první se zabývá numerickým popisem jediné vodní kapky a druhá popisem směsí kapek představující paprsek válcové a ploché trysky. Je založena převážně na vícefázových modelech proudění a vlastních uživatelsky definovaných funkcí (User Defined Functions, UDF) představujících stěžejní část práce. Uvedené výpočtové modely jsou ve většině případů verifikovány pomocí experimentálních dat nebo jiných numerických mod
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Deng, Tian. "LES combined with statistical models of spray formation closely to air-blast atomizer." Thesis, Ecully, Ecole centrale de Lyon, 2011. http://www.theses.fr/2011ECDL0037/document.

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Cette thèse présente une extension de l'approche stochastique de l'atomisation primaire de type air assisté près d'un injecteur. Cette approche avait déjà été introduite dans les publications de Gorokhovski et al. Dans le cadre de la simulation des grandes échelles, la zone d'atomisation primaire est simulée comme un corps immergé avec une structure stochastique. Ce dernier est défini par la simulation stochastique de la position et de la courbure de l'interface entre le liquide et le gaz. La simulation de la position de l'interface est basée sur l'hypothèse de symétrie d'échelle pour la fragm
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Nivlouei, Sahar Jafari. "Droplet deformation simulation due to flow field during droplet fall in the air." Master's thesis, 2014. http://hdl.handle.net/10316/89449.

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Documentos apresentados no âmbito do reconhecimento de graus e diplomas estrangeiros<br>This work is devoted to investigation of free-surface flow associated with drop fall. The main goal of the work is the computational and the theoretical study of the flow generated by drop falling and drop impact onto different surfaces, with relevance for spray impingement. The considered flow configurations include drop impact onto a shallow liquid layer, binary drop collision, drop impact onto a dry wall, nonisothermal drop impact onto a heated wall with the accompanying simultaneous heat transfer withi
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Boutazakhti, Mohamed. "Experimental study of the flow downstream of a 3 x 3 square matrix of swirling droplet laden air jets." 2004. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=94732&T=F.

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Book chapters on the topic "Air-droplet flow"

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Ghosh, S., J. C. R. Hunt, J. C. Phillips, and P. C. H. Miller. "Dynamics of Turbulent Air-Flow in Droplet Driven Sprays." In Advances in Turbulence IV. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1689-3_42.

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Yohana, Eflita, Mohammad Tauviqirrahman, Eka Dharmawan, Mohamad Endy Julianto, Kwang Hwan Choi, and Luhung Damarran Achmad. "CFD Analysis of Water Content and Minimum Droplet Temperature of Spray Drying Product with Inlet Temperature and Air Flow Direction Variation." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3179-6_62.

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Liu, Liang, Yuanlong Yang, and Meiyi Liu. "Experimental Study on the Atomization Characteristics of an Aerosol Spray Nozzle." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230374.

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Inlet air filtration is an important part of the intake systems of the ships and coastal installations which filters out the salt aerosol particles to improve the intake air quality. Experimental systems for the inlet filter should include the salt aerosol nozzle, and the nozzle should be capable of generate various kinds of salt aerosol particles with different diameters since the sea salt aerosol possess many sizes particles in the marine environment. This paper experimentally investigates the effect of two design parameters, droplet mass flow rate and inlet pressure, on the particle diamete
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"Atomized Droplets Forming Film Kinetic Mechanism of Cryogenic Air Minimum Quantity Lubrication." In Thermodynamic Mechanism of Cryogenic Air Minimum Quantity Lubrication Grinding. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-3378-5.ch005.

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The influencing mechanism of nozzle pose on effective action region of the liquid film is analyzed firstly in this chapter. The inclined angle of the nozzle within 12°~20° is beneficial for the liquid film formed by the atomized droplet groups to enter into the grinding zone effectively. A thickness distribution model of the flowing liquid film in the gas-liquid impacting zone under different CA temperatures is constructed. The influencing mechanism of normal and tangential momentum source produced by the gas impacting disturbance flow and droplet impacting onto the steady-state flow on drivin
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"Atomized Droplet Impact Kinetics Behavior of Cryogenic Air Minimum Quantity Lubrication." In Thermodynamic Mechanism of Cryogenic Air Minimum Quantity Lubrication Grinding. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-3378-5.ch004.

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In this chapter, a finite element simulation analysis on dynamic behaviors of droplets when they impact onto the wall and liquid film is carried out. Firstly, the morphological evolutionary mechanism during spreading of droplets is analyzed based on the dynamic model of droplets impacting onto the wall. Secondly, the impacting dynamics of a single droplet onto the wall under different kinematic viscosities, surface tension coefficients, impact velocities, and contact angles are simulated by controlling variables based on physical parameters and atomization parameters of the lubricating oil und
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Folch, Albert. "Mercedes’ Droplets." In How the World Flows. Oxford University PressNew York, NY, 2025. https://doi.org/10.1093/9780197772850.003.0006.

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Abstract This chapter introduces the fascinating efforts of the first automobile engineers to explain how automobiles depend on microfluidic droplet sprays for the proper and rapid mixing of fuel and air. Bertha Benz, the wife of Karl Benz (the inventor of one of the first automobiles), was a visionary entrepreneur who decided to help her husband by undertaking a daring advertising drive in 1888. Their competitors, Wilhelm Maybach and Gottlieb Daimler, designed an engine that featured a spray-nozzle carburetor, which gave it superior performance and power by mixing air with fuel by atomizing t
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Conference papers on the topic "Air-droplet flow"

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Morozov, Vladimir. "Evaporating water droplet in a forced air flow." In THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0046741.

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MURTHY, S., M. LEONARDO, and C. EHRESMAN. "A stagnation pressure probe for droplet-laden air flow." In 23rd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-330.

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Mengyao, Leng, Chang Shinan, Wu Menglong, and Li Yunhang. "Simulation of air-droplet mixed phase flow in icing wind-tunnel." In 7TH INTERNATIONAL SYMPOSIUM ON MULTIPHASE FLOW, HEAT MASS TRANSFER AND ENERGY CONVERSION. AIP, 2013. http://dx.doi.org/10.1063/1.4816920.

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Watanawanyoo, Pipatpong, Hirofumi Mochida, Hiroyuki Hirahara, and Sumpun Chaitep. "Flow Characteristics of Fluid Droplet Obtained From Air Assisted Atomizer." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-31013.

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Air assisted atomizer system was designed and developed for fuel injection. The present purpose is to utilize a low pressure in supplying of atomized fuel. Distilled water was used as test liquid on the experiments for the system of atomization. The results revealed air assisted atomizer had a capability to inject the test liquid in the range of the rates of 0.0019–0.00426 kg/s, with the use of air pressure supplied from 68.9 to 689 kPa. In this research, the test liquid supply pressure was kept constant and the air flow rate through the atomizer was varied over a range of air supply pressure
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Carroll, Brian, and Carlos Hidrovo. "An Experimental Investigation of Droplet Detachment in High-Speed Microchannel Air Flow." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18491.

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This paper experimentally investigates the mechanism of water droplet detachment in a confined microchannel under highly inertial air flow. Experimental observations show that as the Reynolds number in the channel is increased, the droplet transitions from a nearly spherical droplet to a high aspect ratio slug. Scaling arguments are then made to address this behavior in an order of magnitude sense. These results show that although shear stress at the droplet-air interface may contribute to droplet elongation, the major mechanism of droplet detachment appears to be the pressure drop across the
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Jung, Sungki. "Eulerian Approach for Pressureless Air-Mixed Droplet Flow in Atmospheric Icing." In AIAA AVIATION FORUM AND ASCEND 2025. American Institute of Aeronautics and Astronautics, 2025. https://doi.org/10.2514/6.2025-3859.

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Pertzborn, A. J., and W. C. Smith. "Application of a Fiber Optic Probe to High Void Fraction Air/Water Flow." 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/fedsm2008-55043.

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Successful development of CFD models for droplet flows is aided by knowledge of the droplet size distribution in the flow, but current instrumentation for measuring droplet size is limited. In an attempt to improve the quality of data collected, fiber optic probe (FOP) technology was investigated. A spray nozzle injected water droplets into an air stream to create a high void fraction droplet flow. Measurements were acquired with the spray nozzle at two different locations upstream of the FOP position. Mean droplet velocity measurements were acquired using laser Doppler velocimetry (LDV) at th
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Alsulami, R. A., S. Nates, W. Wang, S. H. Won, and Bret Windom. "Effects of Varying Liquid Fuel and Air Co-Flow Rates on Spray Characterisation of an Annular Co-Flow Spray Burner." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90989.

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Abstract Development of efficient and clean combustion systems requires the understanding of all the processes experienced by a complex liquid fuel in IC engines, such as atomization, vaporization, turbulent mixing, and combustion. Many of these processes are interconnected; the atomization process, which leads to various droplet sizes can enhance or diminish the vaporization rate of the liquid fuel and consequently impact the energy conversion process. Furthermore, the combustion/flame stability of liquid-fueled gas turbine can be influenced by the fuel and the air co-flow rates delivered in
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Guo, Min, Keiya Nishida, Chaoqun Wu, and Qingrong Fan. "Numerical Study on Characteristics of Spray under Air Flow in Gasoline Engine." In Small Engine Technology Conference & Exposition. Society of Automotive Engineers of Japan, 2020. http://dx.doi.org/10.4271/2019-32-0616.

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&lt;div class="section abstract"&gt;&lt;div class="htmlview paragraph"&gt;The air flow affects the spray feature and mixture significantly in gasoline engine. The effects of air flow with atmosphere and pressurized ambient pressure were investigated experimentally in the previous work, the gasoline spray characteristics and air flow are analyzed using CFD method in this study. By polishing the model of droplet breakup according to the experimental results, the simulations are taken with various air flow conditions. Modeling of spray injected under typical condition of crossflow is employed to
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Sakkal, F., and Jurgen Vollbrandt. "Experience with Infrared Measurements in Mixed Air-Steam and Water Droplet Flow." In Advanced Course in Measurement Techniques in Heat and MassTransfer. Begellhouse, 1985. http://dx.doi.org/10.1615/ichmt.1985.advcoursemeastechheatmasstransf.140.

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