Impinging jets and droplet dynamics

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August undefined, 2024

Witryna31 maj 2024 · Directing a jet of humid air to impinge on a surface that is cooled below the dew point results in micro-sized water droplets. Lord Rayleigh discussed the phenomenon by contrasting clean to flame-exposed glass and called such behaviour Breath Figures (BF). Historically, utilizing dew as a water source was investigated by … Witryna1 cze 2024 · Typical outcomes of an impinging droplet on a solid surface a Deposition indicates that the droplet deforms and stays attached to the surface. b Prompt splash is characterised by the generation of ...

Dynamics of droplet–film collision Journal of Fluid Mechanics ...

Witryna10 lip 2016 · The objective of this study is to characterize flow parameters for two-dimensional turbulent jets impinging on a flat surface. An integral form of the momentum equation has been used to obtain a ... first coal fired power plant

Dynamics of an impinging jet. Part 1. The feedback phenomenon

Witrynathe dynamics and stability of impinging jets over a broad range of operating conditions. An improved volume-of- ... ogy, atomization, and droplet size distribution agree well with experimental Witryna5 lis 2024 · In this chapter, spray cooling is reviewed from two aspects: the entire spray (spray level) and droplets (droplet level). The discussion on the spray level is focused on the spray cooling performance as a function of fluid properties, flow conditions, surface conditions, and nozzle positioning. WitrynaWhen a droplet impacts a solid surface, the entrapment of a submillimeter-sized bubble and the emission of a high speed jet can be observed at low impact velocities. In this work, we show that bubble entrapment occurs only on sufficiently hydrophobic surfaces within a narrow range of impact velocities. evaporative cooler working

Toward the design of low flow-rate multijet impingement spray atomizers

Fluids Free Full-Text Numerical Study of the Effects of Twin-Fluid ...

Witryna12 kwi 2024 · Mallory and P. E. Sojka, “ On the primary atomization of non-Newtonian impinging jets: Volume I experimental investigation,” Atomization Sprays 24(5), 431 ... Dynamics of a droplet impacting a thin film on a glass substrate: (a) impacting droplet, (b) spreading of the droplet, (c) initiation of the crown, (d) radial and axial growth of … WitrynaIn this fluid dynamics video, Ray-tracing data visualization technique was used to obtain realistic and detailed flow motions during impinging of two liquid jets. Different … first coal chamberWitryna1 sie 2024 · For example, a large contact area between the impinging droplet and target surface can enhance the heat transfer in spray cooling systems (Breitenbach et al., 2024) and minimizing the droplet–surface contact area is beneficial to delay, or even suppress ice nucleation in anti-icing applications (Mishchenko et al., 2010; Maitra et … first coalition 1792

"Witryna30 lis 2015 · The impact of droplets on a deep pool has applications in cleaning up oil spills, spray cooling, painting, inkjet printing, and forensic analysis, relying on the changes in properties such as viscosity, interfacial tension, and density. Despite the exhaustive research on different aspects of droplet impact, it is not clear how liquid … " - Impinging jets and droplet dynamics

Impinging jets and droplet dynamics

Jet dynamics post drop impact on a deep pool - Semantic Scholar

Witryna16 lut 2024 · Published 16 February 2024. Physics, Engineering. We investigate experimentally the jet formed by the collapse of a cavity created by the impact of a drop on a pool of the same aqueous liquid. We show that jets can emerge with very different shapes and velocities, depending on the impact parameters, thus generating droplets … Witryna15 paź 2012 · Download a PDF of the paper titled Impinging Jet Dynamics, by Xiaodong Chen and Vigor Yang Download PDF Abstract: In this fluid dynamics …

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Witryna7 sty 2024 · The impact of a drop onto a stagnant deep liquid pool results in jet formation in the splashing regime. The perturbations in the free surface alter the impact conditions and change the splash dynamics. We present the simulations of the water drop impact onto a deep liquid pool with a moving free surface. WitrynaUnderlying processes governing droplet dynamics are investigated by analyzing the overall energy budget. In addition, an advanced visualization technique using the Ray …

Witryna28 lis 2024 · The effect of plasma fluctuations on the in-flight droplet/particle behavior was studied by Dalir et al. [16,17,18]. It was shown that suspension penetration depth, as well as droplet/particle trajectory, temperature, and velocity, are a strong function of plasma jet fluctuations and injection properties such as injection velocity. Witryna12 kwi 2024 · In this paper, we focus on the evolution of jets that form during the recoil of impinging drops on partially wetting hydrophilic substrates composed of cylindrical …

Witrynadroplet dynamics of liquid sheets formed by two impinging jets. A three-dimensional Volume-of-Fluid (VOF) method with adaptive mesh re nement (AMR) based on octree … Witryna20 kwi 2006 · In a high-speed subsonic jet impinging on a flat plate, the surface pressure fluctuations have a broad spectrum due to the turbulent nature of the high-Reynolds-number jet. However, these pressure fluctuations dramatically change their pattern into almost periodic waves, if the plate is placed close to the nozzle ( x0 / d < …

WitrynaOne aspect of previous investigations that has received modest attention is the dynamics associated with the ver- tical jet that prevails during the droplet collapse portion of the impingement process. For a narrow range of We, very thin jets with attendant high velocity have been observed.

WitrynaThe current work experimentally investigates the flowfield characteristics of an under-expanded turbulent jet impinging on a solid surface for various nozzle-to-plate distances 2.46 D j , 1.64 D j , and 0.82 D j ( D j is the jet hydraulic diameter), and nozzle pressure ratios (NPRs) ranging from 2 to 2.77 . Planar particle image velocimetry (PIV) … first co aquatherm partsWitryna22 wrz 2024 · Dynamics of single droplets impacting on solid surfaces is a fascinating and practically important fluid mechanics phenomena [1–8].Individual droplet collision on a solid substrate is common in many technological processes such as ink–jet printing, rapid spray cooling, plasma spray coating, fuel injection, catalytic wetting, etc. … evaporative cooling cleaning serviceWitryna20 kwi 2006 · In a high-speed subsonic jet impinging on a flat plate, the surface pressure fluctuations have a broad spectrum due to the turbulent nature of the high … first coal mineWitryna1 kwi 2024 · The characteristics of horizontally opposed water jets in the absence and presence of an impinging air jet are investigated visually with high speed camera and quantitatively using phase Doppler ... evaporative cooling building examplesWitryna20 wrz 2024 · An experimental study was conducted to investigate the breakup of a liquid sheet produced by oblique impingement of a liquid jet on a plane solid surface. Experiments are carried out over a wide range of jet Weber number (80–6300) and various jet impingement angles (30 deg, 45 deg, and 60 deg) are employed to study … evaporative cooling calculationWitryna22 maj 2012 · The maximum droplet spread diameter, velocity of the rebounding jet, and the time delay between droplet impact and jet emission were characterized for Weber numbers, We, based on droplet impact speed and diameter, up to 500. The unequal shear stresses and contact angles influence the maximum spread diameters in the … evaporative cooling definition biologyWitryna13 lip 2024 · Existing studies have revealed that the dynamics of an impinging droplet is not only influenced by its physical properties but also affected by the surface wettability 7, 8, the substrate... first co arlington tx