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Journal articles on the topic 'Air-droplet flow'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Burgmann, Sebastian, Veronika Krämer, Michael Dues, et al. "Flow-measurements in the wake of an oscillating sessile droplet using laser-Doppler velocity profile sensor." tm - Technisches Messen 89, no. 3 (2022): 178–88. http://dx.doi.org/10.1515/teme-2021-0119.

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Abstract Although relevant in many technical applications, the removal of sessile droplets on surfaces by an (air-) flow is still hard to predict. The flow around the droplet has not been investigated in detail so far but knowledge on the flow structure is essential for the assessment of appropriate drag force correlation. Small droplets (in the range of 5–40 µl) on PMMA substrate in an air flow are investigated. Due to the small size of the droplet the laser-Doppler velocity profile sensor with frequency shift is applied to measure the flow in the wake of the oscillating, still adhering dropl

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12

Yan, Ming De, Han Ping Mao, and Wei Dong Jia. "Experimental Study on the Gas-Liquid Two Phase Flow of Air-Assist Boom Spraying." Applied Mechanics and Materials 341-342 (July 2013): 371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.371.

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The velocity and diameter distribution of the air-assist boom spraying is studied by a laser Phase Doppler Partic1e Analyzer when the operational parameters is changed, which including airflow velocity of air curtain and vertical relative position between the air curtain and the nozzle. From the experimental results, we find the as the air curtain velocity increases , the size distribution of the droplet is conducive to uniform . At the same air curtain velocity, droplet size decreases with increasing of nozzle pressure. On the right side of each measuring point, the number of droplets is grad

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13

Hanks, James E., and Chester G. McWhorter. "Spray Droplet Size for Water and Paraffinic Oil Applied at Ultralow Volume." Weed Technology 7, no. 4 (1993): 799–807. http://dx.doi.org/10.1017/s0890037x00037787.

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Spray droplet size of water and paraffinic oil was affected by air pressure, nozzle type, and liquid flow rate when applied with an ultralow volume (ULV), air-assist sprayer. Volume median diameters of water were generally larger than oil at constant air pressure and liquid flow rate. Droplet size decreased as air pressure increased, but increased as liquid flow rate increased. Volume median diameters of water droplets ranged from 41 to 838μm and from 16 to 457μm with oil when atomized at air pressures ranging from 14 to 84 kPa. Relative spans ranged from 1.2 to 18.0 and 2.0 to 7.2 for water a

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14

Morozov, Alexey, and Dmitry Zaitsev. "Kinetic approach to the analysis of the flow around a levitating microdroplet." E3S Web of Conferences 459 (2023): 08006. http://dx.doi.org/10.1051/e3sconf/202345908006.

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Two-dimensional direct Monte Carlo simulation of the flow around an evaporating water microdroplet in the air atmosphere above a dry or liquid surface has been carried out. We consider a cylindrical droplet 1 μm in diameter at a distance of 1 μm above the surface. The temperature of the droplet is taken equal to 65°C and 80°C. A significant decrease in the air concentration between the droplet and the liquid film surface is observed. The features of water vapor flow separately from the droplet surface and from the liquid film surface are considered. It is shown that, under certain conditions,

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15

Darwish Ahmad, Adnan, Ahmad Abubaker, Ahmad Salaimeh, and Nelson Akafuah. "Schlieren Visualization of Shaping Air during Operation of an Electrostatic Rotary Bell Sprayer: Impact of Shaping Air on Droplet Atomization and Transport." Coatings 8, no. 8 (2018): 279. http://dx.doi.org/10.3390/coatings8080279.

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Electrostatic rotary bell sprayers (ERBSs) are widely used in the automotive industry. In ERBS, atomization is facilitated using centrifugal forces which disintegrate the paint film inside the cup into droplets at the cup edge. The droplets are then transported by the flow of a shaping air (SA) and electrostatic forces to a target surface; the characteristics of these droplets dramatically influence the quality of a painted surface and the painting transfer efficiency. In the current paper, a novel Schlieren-based visualization of the shaping air in the absence of paint droplets was performed

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16

Pengfei, Zhou, and Sergiy Ryzhkov. "RESEARCH OF SEPARATION GRADIENT AEROSOL TECHNOLOGIES FOR INTENSIFICATION OF HEAT AND MASS TRANSFER PROCESSES IN SYSTEMS OF HIGHLY TURBULENT DISPERSED BIPHASIC FLOWS. DEVELOPMENT OF SHIP SYSTEM FOR AIR FURIFICATION FROM DROPLET MOISTURE." Science Journal Innovation Technologies Transfer, no. 2019-2 (May 5, 2019): 70–85. http://dx.doi.org/10.36381/iamsti.2.2019.70-85.

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The study of gas dynamics and deposition coefficients of the separating profile has been performed. The three-dimensional model of working channels of the ship systems for air purification from droplet moisture is developed. The distribution of velocity, static pressure, dynamic pressure, kinetic energy of turbulence, and deposition coefficients for the flow rates of 5, 10, 15, 20 m/s in separating profiles with the radii of 5, 10, 15, 20, 25 mm. The droplet moisture deposition coefficient is 99.9 %. Designs of the ship systems for air purification from droplet moisture are developed for the a

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17

TARANENKO, ANTON, MARKUS BUSSMANN, and HONGHI TRAN. "A laboratory study of recovery boiler smelt shattering." August 2014 13, no. 8 (2014): 19–26. http://dx.doi.org/10.32964/tj13.8.19.

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A scaled-down experimental apparatus was built to examine smelt shattering during typical recovery boiler operations. Water-glycerine solutions and air were used in place of smelt and steam. A high-speed camera and image processing software were used to record and quantify liquid shattering in terms of droplet number and size distributions, as a function of air velocity, air nozzle position, liquid flow rate, and liquid viscosity. The results showed that increasing shatter jet velocity reduced average droplet size, increasing the liquid flow rate increased droplet size, and placing the shatter

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18

RAMANAUSKAS, Virginijus, Linas PAUKŠTAITIS, Gintautas MILIAUSKAS, and Egidijus PUIDA. "Experimental Investigation of Water Droplet Phase Change in Humidi-fied Air Flow." Mechanics 26, no. 3 (2020): 197–205. http://dx.doi.org/10.5755/j01.mech.26.3.24512.

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An experimental research method and an analysis of the results of a water droplet phase change in the additionally humidified air flow are presented. The diagrams of variation of the equivalent diameter of convectively heated water droplets are presented and analysed. The influence of initial water temperature and additionally humidifying air flow on the phase change of a droplet in transient regime is experimentally substantiated.

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19

Hryshchenko, V. O., B. I. Kotov, and S. P. Stepanenko. "Theoretical study of a flow-through humidifier with a rotary water spray." MECHANICS and AUTOMATICS of AGROINDUSTRIAL PRODUCTION, no. 2(116) (2023): 120–28. http://dx.doi.org/10.37204/2786-7765-2023-2-13.

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Purpose. To formulate a mathematical description of the process of air humidification in a flow-through apparatus with a rotary water sprayer (as an automation object). Methods. The analytical method of research is applied, which is based on determining the dynamic characteristics of heat and mass transfer processes during the interaction of water droplets with an airflow. Results. A mathematical description of the dynamics of a flowing air humidifier with a rotary water sprayer is formulated as a mathematical model of the unsteady mode of heat and mass transfer of sprayed water with an air st

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20

Huang, Xiangfei, Yunwu Li, Lang Chen, and Kechao Wang. "CFD-Based Flow Field Characteristics of Air-Assisted Sprayer in Citrus Orchards." Agriculture 15, no. 10 (2025): 1103. https://doi.org/10.3390/agriculture15101103.

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Air-assisted sprayers are an essential piece of equipment for improving spraying efficiency and pesticide utilization; their performance directly affects the effectiveness of pesticide application. This study, addressing the plant protection needs of hilly citrus orchards, designed an air duct structure for an air-assisted sprayer and analyzed its airflow characteristics and droplet deposition effects based on CFD simulation technology. The reliability of the simulation results was verified through air speed boundary tests, revealing that the maximum effective boundaries of the integrated air

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21

Aihara, T., W. S. Fu, and Y. Suzuki. "Numerical Analysis of Heat and Mass Transfer From Horizontal Cylinders in Downward Flow of Air-Water Mist." Journal of Heat Transfer 112, no. 2 (1990): 472–78. http://dx.doi.org/10.1115/1.2910402.

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A numerical analysis is made of heat and mass transfer from horizontal circular cylinders in a downward flow of air/water mist of polydisperse droplets, taking into account the far-upstream droplet size distribution and the blockage effect of the gas phase flow. The effects of the droplet size distribution, temperatures, and liquid-to-gas mass flow ratio upon the liquid film thickness and wall shear stress, velocity, and temperature of the air-water interface, two-phase Nusselt numbers, etc., are examined.

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22

Song, Yuchao, Yafei Zhang, and Hongtao Gao. "Numerical Analysis of the Free-Falling Process of a Water Droplet at Different Temperatures." Processes 11, no. 1 (2023): 258. http://dx.doi.org/10.3390/pr11010258.

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The collision behavior and ice formation of a water droplet are affected by its falling process. In this paper, the two-phase flow of air and a water droplet at a specific temperature is adopted to investigate the processes of falling and freezing of a single water droplet. To track the air–water droplet interface and the temperature distribution, the level-set method and the non-isothermal flow coupling method are used, and the freezing model is added into the water’s control equations. The numerical results indicated that with the initial temperature at 283.15 K and the spherical shape, the

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23

Wang, Fei, Lin Wang, Guoding Chen, and Donglei Zhu. "Numerical Simulation of the Oil Droplet Size Distribution Considering Coalescence and Breakup in Aero-Engine Bearing Chamber." Applied Sciences 10, no. 16 (2020): 5648. http://dx.doi.org/10.3390/app10165648.

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In order to improve the inadequacy of the current research on oil droplet size distribution in aero-engine bearing chamber, the influence of oil droplet size distribution with the oil droplets coalescence and breakup is analyzed by using the computational fluid dynamics-population balance model (CFD-PBM). The Euler–Euler equation and population balance equation are solved in Fluent software. The distribution of the gas phase velocity field and the volume fraction of different oil droplet diameter at different time are obtained in the bearing chamber. Then, the influence of different initial oi

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24

Jia, Wei Dong, Cheng Li, Jun Lu, Ning Yang, and Zhen Tao Wang. "CFD Simulation of Spraying with Air Jet." Advanced Materials Research 455-456 (January 2012): 228–33. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.228.

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Droplet drift is always an accompaniment of pesticide spraying and can cause serious consequences. In this paper, we used a computational fluid dynamics software package (FLUENT) to analyze flow fields of spraying with air jet under different conditions in the tunnel model, and compared the effect of air jet on spray deposition and drift. Results of this study indicate that air jet can act directly on the spray droplets and affect their distribution and movement. Larger jet velocity has better performance on the drift reduction and droplet deposition. Droplets in the flow fields with larger je

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25

SUGIOKA, KEN-ICHI, and SATORU KOMORI. "Drag and lift forces acting on a spherical water droplet in homogeneous linear shear air flow." Journal of Fluid Mechanics 570 (January 3, 2007): 155–75. http://dx.doi.org/10.1017/s0022112006003065.

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Drag and lift forces acting on a spherical water droplet in a homogeneous linear shear air flow were studied by means of a three-dimensional direct numerical simulation based on a marker and cell (MAC) method. The effects of the fluid shear rate and the particle (droplet) Reynolds number on drag and lift forces acting on a spherical droplet were compared with those on a rigid sphere. The results show that the drag coefficient on a spherical droplet in a linear shear flow increases with increasing the fluid shear rate. The difference in the drag coefficient between a spherical droplet and a rig

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26

Liu, Haiting, and Jiewen Deng. "Influence of Marangoni Effect on Heat and Mass Transfer during Evaporation of Sessile Microdroplets." Micromachines 13, no. 11 (2022): 1968. http://dx.doi.org/10.3390/mi13111968.

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Evaporative cooling is an important method for controlling the temperature of micro devices, and heat and mass transfer from the microdroplets in the evaporation process directly affect the cooling performance. In order to study the droplet heat and mass transfer law in the droplet evaporation process, this paper builds a coupled thermal mass model of droplet evaporation and tests the accuracy of the numerical model through theoretical results. In order to study the influence of the Marangoni effect on the droplet evaporation process and the effects of different initial droplet radius and ambi

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27

Wang, Jie, and Hongfang Gu. "A Study of Moist Air Condensation Characteristics in a Transonic Flow System." Energies 14, no. 13 (2021): 4052. http://dx.doi.org/10.3390/en14134052.

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When water vapor in moist air reaches supersaturation in a transonic flow system, non-equilibrium condensation forms a large number of droplets which may adversely affect the operation of some thermal-hydraulic equipment. For a better understanding of this non-equilibrium condensing phenomenon, a numerical model is applied to analyze moist air condensation in a transonic flow system by using the theory of nucleation and droplet growth. The Benson model is adopted to correct the liquid-plane surface tension equation for realistic results. The results show that the distributions of pressure, tem

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28

Wu, Nan Xing, Tian Tian Zhan, and Zhu Ting Jiang. "The Selection of Ceramic Dry Granulating Machine Spray Device Based on the DPM Model." Applied Mechanics and Materials 716-717 (December 2014): 573–76. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.573.

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In order to improve the dispersity of true particles in the process of ceramic dry granulation, by adding a sprayer in the upper of granulation chamber to make water spray into droplets, which greatly increases the contact area of liquid water and powder. The atomization flow field of plain-orifice-nozzle, pressure-swirl-nozzle, air-blast-nozzle, effervescent-nozzle with 1mm nozzle diameter is simulated based on the DPM model, obtaining the droplet size distribution cloud picture and atomization flow field simulative cloud picture of four kinds of nozzle. The simulation results show that the a

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29

Schlottke, Adrian, and Bernhard Weigand. "Two-Phase Flow Phenomena in Gas Turbine Compressors with a Focus on Experimental Investigation of Trailing Edge Disintegration." Aerospace 8, no. 4 (2021): 91. http://dx.doi.org/10.3390/aerospace8040091.

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Two-phase flow in gas turbine compressors occurs, for example, at heavy rain flight condition or at high-fogging in stationary gas turbines. The liquid dynamic processes are independent of the application. An overview on the processes and their approach in literature is given. The focus of this study lies on the experimental investigation of the trailing edge disintegration. In the experiments, shadowgraphy is used to observe the disintegration of a single liquid rivulet with constant liquid mass flow rate at the edge of a thin plate at different air flow velocities. A two side view enables ca

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Bai, Peng Bo, Yu Ming Xing, and Ze Wang. "Experiment Study and Simulation Research for the Atomization Characteristics of the Internal-Mixing Twin-Fluid Atomizer." Advanced Materials Research 1049-1050 (October 2014): 1075–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.1075.

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The internal-mixing twin-fluid atomizer has found wide application in aerospace, industrial gas turbine, oil-fired boiler, energy field and so on. The atomization characteristics of internal mixing nozzle under different operating conditions are studied by utilizing the Malvern laser particle size analyzer. According to the experiment results, the influence of air pressure, hydraulic pressure and air-liquid ratio to droplet size and uniformity are analyzed. The three-dimensional flow field model of internal mixing nozzle is built to simulate the droplet size of mixing room and outlet by Fluent

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31

Sun, Hengchao, Guoding Chen, Yonghong Zhang, and Li’na Wang. "Theoretical and experimental studies on the motion and thermal states of oil droplet in a bearing chamber." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 230, no. 14 (2016): 2596–614. http://dx.doi.org/10.1177/0954410016629690.

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Study on the motion and thermal states of oil droplet is an important part of research on the oil/air two-phase flow and heat transfer in an aero engine bearing chamber. In this paper, dimensional analysis is applied to the airflow analysis of bearing chamber. That makes the analysis model suitable for a wide range of geometric and operating conditions. Moreover, the temperature solution is added to the oil droplet motion analysis. That could promote the calculation accuracy of the droplet trajectory, velocity, and temperature. Firstly, the similarity criteria of the airflow in a bearing chamb

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32

Vuckovac, Maja, Matilda Backholm, Jaakko V. I. Timonen, and Robin H. A. Ras. "Viscosity-enhanced droplet motion in sealed superhydrophobic capillaries." Science Advances 6, no. 42 (2020): eaba5197. http://dx.doi.org/10.1126/sciadv.aba5197.

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It is well known that an increased viscosity slows down fluid dynamics. Here we show that this intuitive rule is not general and can fail for liquids flowing in confined liquid-repellent systems. A gravity-driven, highly viscous glycerol droplet inside a sealed superhydrophobic capillary is moving more than 10 times faster than a water droplet with three-orders-of-magnitude lower viscosity. Using tracer particles, we show that the low-viscosity droplets are rapidly rotating internally, with flow velocities greatly exceeding the center-of-mass velocity. This is in stark contrast to the faster m

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Anisiuba, Vitalis, Haibo Ma, Armin Silaen, and Chenn Zhou. "Computational Studies of Air-Mist Spray Cooling in Continuous Casting." Energies 14, no. 21 (2021): 7339. http://dx.doi.org/10.3390/en14217339.

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Due to the significant reduction in water droplet size caused by the strong air-water interaction in the spray nozzle, air-mist spray is one of the promising technologies for achieving high-rate heat transfer. This study numerically analyzed air-mist spray produced by a flat-fan atomizer using three-dimensional computational fluid dynamics simulations, and a multivariable linear regression was used to develop a correlation to predict the heat transfer coefficient using the casting operating conditions such as air-pressure, water flow rate, casting speed, and standoff distance. A four-step simu

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34

Zhao, Yumeng, Alexander Russell, Kingsly Ambrose, and Carl R. Wassgren. "Prediction of Air Purifier Effectiveness for Eliminating Exhaled Droplets in a Confined Room." Processes 12, no. 9 (2024): 1917. http://dx.doi.org/10.3390/pr12091917.

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High-efficiency particulate air (HEPA) filter purifiers are a recommended method for eliminating respiratory airborne droplets. In this study, the movement of airborne droplets exhaled by occupants in an unventilated, two-bed dormitory room with an air purifier was simulated using computational fluid dynamics. The air was modeled using an Eulerian scheme while the droplets were modeled using a Lagrangian method. The airborne droplet number, the rate at which droplets are removed, and the rate at which droplets accumulate were calculated. A larger HEPA flow rate increased the droplet removal ef

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35

Murthy, S. N. B., M. Leonardo, and C. M. Ehresman. "A stagnation pressure probe for droplet-laden air flow." Journal of Propulsion and Power 2, no. 3 (1986): 195–96. http://dx.doi.org/10.2514/3.22868.

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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." Applied Scientific Research 51, no. 1-2 (1993): 257–62. http://dx.doi.org/10.1007/bf01082546.

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Hao, Pengfei, Cunjing Lv, and Zhaohui Yao. "Droplet Detachment by Air Flow for Microstructured Superhydrophobic Surfaces." Langmuir 29, no. 17 (2013): 5160–66. http://dx.doi.org/10.1021/la400187c.

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Glahn, A., M. Kurreck, M. Willmann, and S. Wittig. "Feasibility Study on Oil Droplet Flow Investigations Inside Aero Engine Bearing Chambers—PDPA Techniques in Combination With Numerical Approaches." Journal of Engineering for Gas Turbines and Power 118, no. 4 (1996): 749–55. http://dx.doi.org/10.1115/1.2816990.

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The present paper deals with oil droplet flow phenomena in aero engine bearing chambers. An experimental investigation of droplet sizes and velocities utilizing a Phase Doppler Particle Analyzer (PDPA) has been performed for the first time in bearing chamber atmospheres under real engine conditions. Influences of high rotational speeds are discussed for individual droplet size classes. Although this is an important contribution to a better understanding of the droplet flow impact on secondary air/oil system performance, an analysis of the droplet flow behavior requires an incorporation of nume

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Jiang, Shijie, Wenwei Li, Shenghui Yang, Yongjun Zheng, Yu Tan, and Jiawei Xu. "Factors Affecting Droplet Loss behind Canopies with Air-Assisted Sprayers Used for Fruit Trees." Agronomy 13, no. 2 (2023): 375. http://dx.doi.org/10.3390/agronomy13020375.

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Air-assisted sprayers are widely employed in orchards, but inappropriate spray parameters can lead to large droplet losses, pesticide waste, and environmental pollution. To investigate the factors affecting the droplet loss of an air-assisted sprayer behind canopies, a two-factor, five-level full experiment was conducted in an actual orchard, where the two factors were the power gradient and foliage area volume density (FAVD). In addition, the location of the sampling point was also considered in the data analysis, including horizontal distance, forward distance, and height. The results show t

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Antonov, Dmitrii, and Pavel Strizhak. "Explosive disintegration of two-component droplets in a gas flow at its turbulization." Thermal Science 23, no. 5 Part B (2019): 2983–93. http://dx.doi.org/10.2298/tsci180804065a.

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The experimental results shown that the mode of droplet disintegration dominates in the laminar flow, and the intensive fragmentation is prevalent in the turbulent flow during almost the entire time of heating. Typical dependences of the time of droplet heatup before disintegration or fragmentation on the temperature, flow rate, structure and regime (laminar and turbulent) are established. The studies are conducted with heated air and flue gases to ensure the application of the research results in the technology of thermal and flame cleaning of liquids from irregular impurities. It is shown th

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Mastiani, Mohammad, Babak Mosavati, and Myeongsub (Mike) Kim. "Numerical simulation of high inertial liquid-in-gas droplet in a T-junction microchannel." RSC Adv. 7, no. 77 (2017): 48512–25. http://dx.doi.org/10.1039/c7ra09710g.

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Akabane, Masaaki, Sachiyo Horiki, Masahiro Osakabe, et al. "ICONE23-1467 Behavior of Entrainment Droplet formed by High Velocity Air Jet Flow in Stagnant Water." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_214.

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Shen, Xiaobin, Chunhua Xiao, Yijun Ning, Huanfa Wang, Guiping Lin, and Liangquan Wang. "Research on the Methods for Obtaining Droplet Impingement Characteristics in the Lagrangian Framework." Aerospace 11, no. 3 (2024): 172. http://dx.doi.org/10.3390/aerospace11030172.

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The impact of supercooled water droplets is the cause of aircraft icing, and the acquisition of impingement characteristics is the key to icing prediction and the design of ice protection systems. The introduction of water droplet collection efficiency is required to obtain the characteristics for the Lagrangian method. In this work, a traditional flow tube method, a local flow tube method, and a statistical method are established to calculate the local collection efficiency, based on Lagrangian droplet trajectories. Through the numerical simulations of the air–droplet flow field around an NAC

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Liu, Liang, Xingwei Wu, Dian Wang, and Yue Yin. "Numerical Investigation on the Atomization Characteristics of An Aerosol Spray Nozzle." Journal of Physics: Conference Series 2331, no. 1 (2022): 012011. http://dx.doi.org/10.1088/1742-6596/2331/1/012011.

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Abstract Inlet air filtration of ships and coastal installations is mainly used to filter out salt aerosol particles, so researches on the inlet filter needs to simulate spray aerosol state in the marine environment. The sea salt aerosol particles have multiple sizes, thus salt aerosol generator should have the ability to produce salt aerosol particles of various diameters. This paper investigates the factors that affect the particle diameter of a salt aerosol generating device. Numerical simulations on the two-phase flow in a salt aerosol nozzle are conducted and the influence of air inlet pr

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Sun, Hengchao, Guoding Chen, Li’na Wang, and Fei Wang. "Ligament and Droplet Generation by Oil Film on a Rotating Disk." International Journal of Aerospace Engineering 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/769862.

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The lubrication and heat transfer designs of bearing chamber depend on an understanding of oil/air two-phase flow. As initial and boundary conditions, the characteristics of ligament and droplet generation by oil film on rotating parts have significant influence on the feasibility of oil/air two-phase flow analysis. An integrated model to predict the oil film flow, ligament number, and droplet Sauter mean diameter (SMD) of a rotating disk, which is an abstraction of the droplet generation sources in a bearing chamber, is developed based on the oil film force balance analysis and wave theory. T

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Liu, Meng, and Yufeng Duan. "Predicting the Liquid Film Thickness and Droplet–Gas Flow in Effervescent Atomization: Influence of Operating Conditions and Fluid Viscosity." International Journal of Chemical Reactor Engineering 11, no. 1 (2013): 393–405. http://dx.doi.org/10.1515/ijcre-2013-0073.

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Abstract The droplet–gas flow in effervescent atomization was simulated using a comprehensive numerical model. Liquid film thicknesses in the nozzle exit orifice and droplet size distribution at the downstream of spray were calculated. The thickness of liquid film in the nozzle exit orifice increased and approached the droplet size in the primary atomization, as the air–liquid ratio increased. The primary breakup model can accurately predict the Sauter mean diameter in the primary atomization when gas–liquid two-phase flow belongs to the annular flow in the nozzle exit orifice. The viscosity o

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Law, C. K., T. Y. Xiong, and C. Wang. "Alcohol droplet vaporization in humid air." International Journal of Heat and Mass Transfer 30, no. 7 (1987): 1435–43. http://dx.doi.org/10.1016/0017-9310(87)90175-x.

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Singh, Digvijay, and Arup Kumar Das. "Predictability and benefits of coupled Eulerian-Lagrangian approach over Eulerian characterization of droplet annular flow." Fluid Dynamics Research 53, no. 6 (2021): 065501. http://dx.doi.org/10.1088/1873-7005/ac34ec.

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Abstract Wavy annular flow and subsequent droplet dispersion in air-water two-phase flow has been studied numerically using conventional Eulerian volume of fluid (VOF) solver and coupled Eulerian-Lagrangian approach. The VOF based investigation has been reported to highlights the formation of droplet swarm and its population dynamics. Coupled Eulerian-Lagrangian method has also been shown to replicate similar features with lesser computational effort. Entrainment, deposition, fragmentation and unification are traced from the numerical simulation, which ultimately predicts the volume filling be

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Zi, Xintian, Kai Chen, Qinghua Bai, et al. "The Enhancement of Oil Delivery and Bearing Performance via A Guiding-Structured Nozzle under Oil–Air Lubrication." Lubricants 12, no. 2 (2024): 60. http://dx.doi.org/10.3390/lubricants12020060.

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The oil–air lubrication method is specifically employed for high or ultra-high-speed spindle rolling bearings. Under high-speed conditions, the air curtain formed inside the bearing cavity obstructs oil delivery, thereby limiting further increases in spindle rotation speed. To enhance oil delivery capability, a guiding-structured nozzle has been developed to concentrate the jet flow and improve penetration through the air curtain. Tests were conducted on an oil–air lubricated bearing test bench to investigate the impact of nozzle structures and oil types on torque and temperature rise. The res

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Xiao, Yunlei, Zhixun Xia, Liya Huang, Likun Ma, and Dali Yang. "Atomization of Gel Fuels with Solid Particle Addition Utilizing an Air Atomizing Nozzle." Energies 11, no. 11 (2018): 2959. http://dx.doi.org/10.3390/en11112959.

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Microscopic high-speed imaging is used to experimentally measure the velocity and size of droplets of gelled RP-1 based fuels with a solid particle additive. The gels are atomized using an air atomizing nozzle. The droplet diameter and velocity at a fixed position 20 cm from the nozzle on the centerline of the spray are measured at air mass flow rates of 1.5, 3 and 5 g/s. A parametric study is conducted to study the effect of gas mass flow rate, boron particle content, and species of the solid particle on the droplet characteristics. The results indicate that the droplet size decreases with th

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