Dynamic Impact Behavior of Water Droplet on a Superhydrophobic Surface in the Presence of Stagnation Flow

Morteza Mohammadi; Sara Moghtadernejad; Percival J.  Graham; Ali Dolatabadi

doi:10.4028/www.scientific.net/AMM.232.267

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 232Dynamic Impact Behavior of Water Droplet on a...

Dynamic Impact Behavior of Water Droplet on a Superhydrophobic Surface in the Presence of Stagnation Flow

Abstract:

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 and formation of satellite droplets. Consequently, for the co-flow droplet impact experiments, the mass of the recoiled droplet is significantly smaller than that of the impinging droplet in still air.

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Periodical:

Applied Mechanics and Materials (Volume 232)

Pages:

267-272

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.232.267

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Online since:

November 2012

Authors:

Morteza Mohammadi, Sara Moghtadernejad, Percival J. Graham, Ali Dolatabadi

Keywords:

Droplet Accelerator, Droplet Impact, Splashing Phenomenon, Spreading Diameter, Stagnation Flow, Superhydrophobic Surface

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