Effect of Substrate Temperature on Splashing of Molten Tin Droplets

Mehdizadeh, Navid Z.; Raessi, Mehdi; Chandra, Sanjeev; Mostaghimi, J.

doi:10.1115/1.1737778

Cited by 23 publications

(16 citation statements)

References 21 publications

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“…By synchronizing the position of the rotating substrate with the ejection of droplet, the substrate hit the falling droplet at a high velocity while a fast-shutter chargecoupled device (CCD) camera captured the dynamics of impact. Figure 1 shows a schematic of the experimental apparatus, which has been described in detail by Mehdizadeh et al (2004a).…”

Section: Experimental Methodsmentioning

confidence: 99%

Rupture of thin films formed during droplet impact

Dhiman

Chandra

2009

Proc. R. Soc. A.

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Rupture of liquid films formed during droplet impact on a dry solid surface was studied experimentally. Water droplets (580 ± 70 μm) were photographed as they hit a solid substrate at high velocities (10-30 m s −1 ). Droplet-substrate wettability was varied over a wide range, from hydrophilic to superhydrophobic, by changing the material of the substrate (glass, Plexiglas, wax and alkylketene dimer). Both smooth and rough wax surfaces were tested. Photographs of impact showed that as the impact velocity increased and the film thickness decreased, films became unstable and ruptured internally through the formation of holes. However, the impact velocity at which rupture occurred was found to first decrease and then increase with the liquid-solid contact angle, with wax showing rupture at all impact velocities tested. A thermodynamic stability analysis combined with a droplet spreading model predicted the rupture behaviour by showing that films would be stable at very small or at very large contact angles, but unstable in between. Film rupture was found to be greatly promoted by surface roughness.

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Section: Experimental Methodsmentioning

confidence: 99%

Rupture of thin films formed during droplet impact

Dhiman

Chandra

2009

Proc. R. Soc. A.

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“…1) has been given by Mehdizadeh et al [13], so it will be described only briefly here. It consisted of a molten metal droplet generator [15] that can produce uniform-sized tin droplets (0.6 mm diameter) on demand.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…Numerical simulations [13] have shown that a molten tin droplet impacting on a colder substrate begins to freeze first around its periphery, where the substrate temperature is lowest. If the solid rim becomes thick enough it obstructs liquid flow and triggers an instability that leads to splashing.…”

Section: Predicting Transition Temperaturementioning

confidence: 99%

“…At T s,i = 200°C solidification was sufficiently delayed that droplets spread to form thin discs. Computer simulations [13] have shown that freezing around the droplet periphery during spreading on a substrate at low temperature obstructs liquid flow and triggers splashing. When substrate temperature is increased, freezing is slowed down and the droplet spreads in the form of a thin liquid sheet without any splashing.…”

Section: Transition Temperaturementioning

confidence: 99%

“…The impact Weber number of such droplets is much lower than those in typical industrial applications (We $ 10 2 in experiments, compared to We $ 10 3 in applications) and in such cases droplet solidification suppresses splashing [10]. Mehdizadeh et al [13] built an apparatus in which molten tin droplets impinged on a steel plate mounted on the rim of a rotating flywheel, giving impact velocities of up to 40 m/s and We $ 10 3 . Photographs of splashing droplets were compared with predictions from computer simulations that showed that freezing around the edges of a spreading droplet obstructs liquid flow and causes splashing.…”

Section: Introductionmentioning

confidence: 97%

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Freezing-induced splashing during impact of molten metal droplets with high Weber numbers

Dhiman

Chandra

2005

International Journal of Heat and Mass Transfer

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Metal Droplet Deposition: From Foundation to Engineering Manufacturing

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Cao

et al. 2022

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Figure 5. a) Gas entrapment phenomenon of n-heptane droplets hitting the surface of stainless steel substrate. Reproduced with permission. [34] Copyright 1991, Royal Society. b) Simulation of gas entrapment by water droplets hitting a stainless steel substrate. Reproduced with permission. [10] Copyright 2003, AIP Publishing. c) Ultrafast X-ray phase-contrast imaging tracks the evolution of water droplet-trapping gas film. Reproduced with permission. [11] Copyright 2012, American Physical Society. d) Aluminum droplet gas entrapment phenomenon. Reproduced with permission. [12] Copyright 2016, Elsevier. e) Simulation of molten metal droplet gas entrapment evolution. Reproduced with permission.

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Effect of Substrate Temperature on Splashing of Molten Tin Droplets

Cited by 23 publications

References 21 publications

Rupture of thin films formed during droplet impact

Rupture of thin films formed during droplet impact

Freezing-induced splashing during impact of molten metal droplets with high Weber numbers

Metal Droplet Deposition: From Foundation to Engineering Manufacturing

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