Surface wetting effects on the spreading of liquid droplets impacting a solid surface at low Weber numbers

Role of polymer concentration and molecular weight on the rebounding behaviors of polymer solution droplet impacting on hydrophobic surfaces

“…A droplet at the maximum spreading state is assumed as a thin circular disk. Although this assumption is somewhat unrealistic, yet the models derived based on this assumption are robust and the theoretical analysis on the dynamic behaviors of a droplet shows good agreement with experimental results (German and Bertola 2009;Healy et al 2001;Mao et al 1997;Ukiwe and Kwok 2005). The top surface area, the circumferential edge area, and the height of the disk are expressed as (π/4)D 2 max , 2π/3(D 3 0 /D max ) and 2/3(D 3 0 D 2 max ), respectively.…”

The dynamics of impacting water droplets on alkanethiol self-assembled monolayers with co-adsorbed CH3 and CO2H terminal groups

“…In subsequent studies [17,43] using a computational fluid dynamics approach, it was observed that the droplet spreading process was highly dependent on We, Re, and the contact angle θ . The K-Y model was then improved by incorporating wetting effects explicitly using contact angle.…”

“…The surface tensions of our target substrates (and hence contact angles) are carefully tailored indirectly by means of surface chemistry via a so-called self-assembled monolayers (SAMs) [29][30][31][32][33], providing a range of hydrophobic and hydrophilic surfaces. Two parent SAMs were selected: a hydrophobic 1-octadecanethiol [HS(CH 2 ) 17 CH 3 ] and a hydrophilic 16-mercaptohexadecanoic acid [HS(CH 2 ) 15 CO 2 H]. A quantity of 5 mM of this binary mixture solution in four different volume fractions was employed for molecular assembly on metal-based surfaces.…”

Empirical model for the maximum spreading diameter of low-viscosity droplets on a dry wall

“…Most models were based on the energy balance corresponding to the pre-impact state and the state at maximum spread. Bennet and Polikakos [3], Mao et al [4], Healy et al [5], and German and Bertola [6] considered the wettability effect (or contact angle), while Chandra and Avedisian [7] and Pasandideh-Fard et al [8] considered the dynamic contact angle. Yang [9], Madejski [10], Asai et al [11] and Fukanuma and Ohmori [12] did not consider the contact angle.…”