Pressure drop and dynamic contact angle of triple-line motion in a hydrophobic microchannel

Effective three-dimensional superhydrophobic aerogel-coated channel for high efficiency water-droplet transport

“…20,21,23,24 The hydrodynamic model 21,23,24 reports that the dissipation occurs due to viscous flow within the wedge of liquid near the TL; in this model, the dynamic CAs are ascribed to viscous bending of the liquid-gas interface within near TL which is below the scale of our observation. In contrast, the molecular kinetics model 20,23,24 emphasizes events occurring due to attachment and detachment of fluid particles close to the TL; the dissipation is the dynamic friction resulting from process occurring during TL movement.…”

“…18 In minisystems and microsystems, TL has an important influence on flow characteristics such as friction corresponding to pressure drop inside the channel. [19][20][21][22] Recently, some groups focused on how the effect of TL on DP TL depends on wettability in dynamic multiphase systems. [19][20][21] In such systems, TL motion dissipates a large amount of energy; this dissipation energy is strongly related to wettability.…”

“…[19][20][21][22] Recently, some groups focused on how the effect of TL on DP TL depends on wettability in dynamic multiphase systems. [19][20][21] In such systems, TL motion dissipates a large amount of energy; this dissipation energy is strongly related to wettability. 20,21 Therefore, understanding how wettability of a channel affects TL movement of droplet is essential for predicting the total pressure drop DP T required to cause a droplet to begin to move.…”

“…21 The pressure drop caused by the moving TL originates from intermolecular attraction forces near the TL of the droplet on the solid surface. 22 This pressure drop is dependent on the droplet's velocity and CAs and is obtained as by subtracting pressure drops due to viscous drag forces from DP T .…”

The impact of contact angle on flow resistance reduction in hydrophobic micro pin fins

“…In addition, a noticeable effect on the turbulence structure occurred when the slip length was greater than a certain value. Yu D. [13] measured the pressure drops of slugs with triple-lines for various diameters, fluids, and a range of velocities (0.01-0.4 m/s). Dynamic contact angles were calculated from an equation describing the pressure drop of a triple-line, and it was found that the previous correlations had underestimated the dynamic contact angles in comparison with the experimental values, and then a new dynamic contact angle correlation for a regime was proposed.…”