An experimental investigation of water droplet impingement on a heated wax surface

Manzello, Samuel L.; Yang, Jiann C.

doi:10.1016/j.ijheatmasstransfer.2003.10.020

Cited by 34 publications

(14 citation statements)

References 32 publications

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“…Early studies were done by Aziz and Chandra (2000); Bhola and Chandra (1999). Boiling and evaporation on the other hand is important for safety and fire prevention, like the operation of sprinkler systems (Manzello and Yang (2004)); the spraying of molten materials into cold baths to produce powders and spray deposition (Yule and Dunkley (1994)), or drop encapsulation by immersion into reacting liquid baths (Lhuissier et al (2013)). Droplets impacting solid surfaces heated well above their boiling point are subjected to violent nucleate boiling or Leidenfrost effect, also called filmboiling, where a stable layer of vapor insulates the drop from the solid surface.…”

Section: Introductionmentioning

confidence: 99%

“…These explosions can initiate shock waves that may damage equipment and even injure personnel in the vicinity of the event (Reid (1983)). The intensity of the explosion is seen to increase with higher temperatures (Dullforce et al (1976); Matsumura and Nariai (1996); Miyazaki et al (1984); Lin et al (2014); Sa et al (2011);Taleyarkhan (1998);Zielinski et al (2011);Kouraytem et al (2016)) Only a few studies have investigated the influence of the liquid pool temperature on the dynamics of the interaction with droplets at room temperature (Manzello and Yang (2004); ; Wang et al (2009)). studied the impact behavior of distilled water as well as the coolant HFE-7100 that has a low boiling point (62 o C) on an pool of heated peanut oil, with impact Weber number for water and HFE-7100 droplets fixed at 200, and 188, respectively while varying the temperatures of the pool up to 220 o C. No violent explosions took place until the drop sank to the bottom of the container, that is heated on a hot plate, promoting the vapor explosions.…”

Section: Introductionmentioning

confidence: 99%

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Vortex-induced vapor explosion during drop impact on a superheated pool

Alchalabi

Kouraytem

et al. 2017

Experimental Thermal and Fluid Science

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Ultra high-speed imaging is used to investigate the vapor explosion when a drop impacts onto a high-temperature pool. The two liquids are immiscible, a low boiling-temperature perfluorohexane drop, at room temperature, which impacts a high boiling-temperature soybean-oil pool, which is heated well above the boiling temperature of the drop. We observe different regimes: weak and strong nucleate boiling, film boiling or Leidenfrost regime and entrainment followed by vapor explosion. The vapor explosions were seen to depend on the formation of a rotational flow at the edge of the impact crater, near the pool surface, which resembles a vortex ring. This rotational motion entrains a thin sheet of the drop liquid, to become surrounded by the oil. In that region, the vapor explosion starts at a point after which it propagates azimuthally along the entire periphery at high speed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vortex-induced vapor explosion during drop impact on a superheated pool

Alchalabi

Kouraytem

et al. 2017

Experimental Thermal and Fluid Science

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“…When liquid droplet impacts on hot surface, behavioral patterns of impinging droplet are subject to heat transfer between impacting substrate and liquid droplet 14–19. In the course of drop impact, heat flux can be determined by experimental study20–22 or numerical simulation 23–27.…”

Section: Introductionmentioning

confidence: 99%

Behavioral patterns of drop impingement onto rigid substrates with a wide range of wettability and different surface temperatures

Lan

2009

AIChE Journal

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This article concerns behavioral patterns of droplet impingement onto solid substrates covering a wide range of wettability from hydrophilic to superhydrophobic surfaces heated at different temperatures. For droplet impingement onto partial hydrophobic surfaces (mirror-polished Cu substrate), the maximum heights of receding droplet undergoing a consecutive increment with surface temperature can be explained taking account of Marangoni flow. Also, the relation to predict the increment of droplet heights with surface temperature was manifested in the light of lubrication approximation combined with energy conservation. However, this relation is only valid for droplet impacts onto partial hydrophobic surface, because the recoiling droplet height was observed to be independent of surface temperature for both hydrophilic and superhydrophobic targets. This phenomenon was attributed to inherent wettability accompanying larger contact angle hysteresis for the hydrophilic substrate and to the presence of an adiabatic gas layer between the composite surface and impacting droplet, for the superhydrophobic target. V

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“…Other important fields of application for droplet generators are their use as micropumps [6,7] and as dispensing devices for DNA microarrays [8]. The collision of droplets, produced by a droplet generator, with a surface has been investigated both for general purposes [9] and for the investigation of combustion processes [10]. Studies of the dynamic behavior of droplets for fire suppression make use of droplet generators to measure the cooling capacity of the water aerosols [11].…”

Section: Introductionmentioning

confidence: 99%

Generation of Monodisperse Micron‐Sized Droplets using Free Adjustable Signals

Riefler

Wriedt

2008

Part & Part Syst Charact

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This paper describes the generation of small water droplets in the size range down to a few microns. Commercially available inkjet printing devices are not suitable for producing such droplets since they produce satellite droplets. Furthermore, standard drop-on-demand devices are normally restricted to the generation of droplets with the same size as the orifice diameter. Using a new and more sophisticated computer-based signal generation system, smaller-sized droplets can be generated from the same orifice. A key feature of the design is the generation of freely definable pulses. This enables the generation of acoustic modes within the fluid of the droplet generator, which leads to the generation of droplets without satellites. Only very few pulse forms enable the generation of suitable acoustic modes. Therefore, it is necessary to look for the specific pulse corresponding to the chosen droplet generator. Flexible pulse form generation appears to be more suitable than simple pulse forms for the generation of such droplets.

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An experimental investigation of water droplet impingement on a heated wax surface

Cited by 34 publications

References 32 publications

Vortex-induced vapor explosion during drop impact on a superheated pool

Vortex-induced vapor explosion during drop impact on a superheated pool

Behavioral patterns of drop impingement onto rigid substrates with a wide range of wettability and different surface temperatures

Generation of Monodisperse Micron‐Sized Droplets using Free Adjustable Signals

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