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wetting, surface tension, droplet and capillarity

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Sudeesh Patel

This document summarizes research on the impact of drops on inclined liquid surfaces and hot surfaces. It describes the experimental setup used to study drops of silicon oil impacting a submillimetric layer of silicon oil. The impact behavior depends on parameters like the Weber number and can result in bouncing, coalescence, or splitting. As the Weber number increases from below 4 to above 15, the behavior transitions from complete bouncing to total merger. Images show examples of the different behaviors. Future work could analyze the flow after impact and shock waves generated.

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DROP IMPACT ON INCLINED BATH Prepared by- Sudeesh kumar patel (ME18D038)
Experimental setup https://www.researchgate.net/figure/Impact-of-a-drop-on-a-liquid-surface-may-result- in-coalescence-bouncing-or-splashing_fig1_271388735
Drop coalesce Drop bounce Drop split https://fluids.ac.uk/pictures/competition/4- droplet_splash.jpg
Parameters Drop - silicon oil Drop radius - 0.94賊0.02 mm Camera - 3000 fps Pixel - 23 Submillimetric layer of silicon oil Dimensionless number - Weber number Ohnesorge number Bond number
Mechanism of drop impact on fluid bath https://www.researchgate.net/figure/Impact-of-a-drop-on-a-liquid-surface-may- result-in-coalescence-bouncing-or-splashing_fig1_271388735
We<4 complete bouncing The air layer survives the impacting droplet, so there is no merger. The droplet strongly deforms, then takes off and recovers its spherical shape 4<We<15 complex series of intermediate regimes is found where the incoming drop splits into a number of outgoing daughter droplets. We>15 The air layer breaks and total merger occurs between the droplet and the underlying film Tristan Gilet and John W. M. Bush
a.We=1.7b.We=3.9c.We=5.8d.We=12.1e.We=12.1f.We1n=15.3 Tristan Gilet and John W. M. Bush
wetting, surface tension, droplet and capillarity
Volume in bouncing, splitting and coalesce Outgoing droplet is elongated, so the output time may occur before lift-off Tristan Gilet and John W. M. Bush
Slight decrease observed for large We1n indicates that a droplet squeezed by a relatively violent impact experiences Time delay tc between the input and the output, normalized by the contact time Tristan Gilet and John W. M. Bush
Diesel drop impinging on a hot surface Rong-Horng Chen
Impact of a diesel drop on a stainless steel surface above the Leiden frost temperature Rong-Horng Chen
Rong-Horng Chen
Rong-Horng Chen
Future scope we can analyze the flow behavior after drop impact on the liquid. We can analyze the shock wave generated after drop impact on the inside the fluid We can analyze the drop impact on the flexible material
REFERENCES 1. Rong-Horng ChenOn the collision behaviors of a diesel drop impinging on a hot surface Experimental Thermal and Fluid Science 32 (2007) 587595 2. John W. M. BushaDroplets bouncing on a wet, inclined surface Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts PHYSICS OF FLUIDS 24, 122103 (2012)

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wetting, surface tension, droplet and capillarity