Download Advances in Contact Angle, Wettability and Adhesion, Volume by K.L. Mittal(eds.) PDF

By K.L. Mittal(eds.)

The subject of wettabilty is intensely vital from either primary and utilized elements. The functions of wettability diversity from self-cleaning home windows to micro- and nanofluidics.

This e-book represents the cumulative knowledge of a contingent of world-class (researchers engaged within the area of wettability. within the previous few years there was super curiosity within the "Lotus Leaf impression" and in realizing its mechanism and the way to duplicate this impact for myriad functions. the subjects of superhydrophobicity, omniphobicity and superhydrophilicity are of a lot modern curiosity and those are lined intensive during this book.

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Additional info for Advances in Contact Angle, Wettability and Adhesion, Volume 001

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6 CA hysteresis for different values of the constant c. (a) Two-phase interface, (b) Three-phase interface, (c) Four-phase interface, (d) Comparison of the CA hysteresis of two-, three- and four-phase interfaces [28]. 6 shows how the CA hysteresis changes versus spacing factor for different values of the constant c. It is observed that with increasing the spacing factor, S P2 , CA hysteresis increases for two-, three- and four-phase interfaces. 6d that CA hysteresis for four-phase interface is greater than that for three- and two-phase interfaces [28].

2). For a water droplet on a solid surface in air, missing hydrogen bonds and the reorientation of the network of hydrogen bonds contribute to the surface tension. The interactions at the solid-water interface are due to the London dispersion forces. For an air bubble this component is weak or absent, unlike in the case of an oil bubble [28]. 2 Forces contributing to the droplet/bubble adhesion to solid [28]. 1 Numerical Modeling of CA Hysteresis Background Models described above can be called macroscopic, since they treat both fluid and solid as continuum media which satisfy the equations of hydrodynamics and elasticity, and deal with the macroscale thermodynamic parameters such as the contact angle (CA).

The energy required to separate liquid and solid is greater than the energy gained by bringing them together. This occurs due to molecular reorientation and rearrangement. This difference constitutes the adhesion hysteresis, TW . 5) In other words, the CA hysteresis is equal to dissipated energy during the motion of a droplet. This dissipation can occur either in the bulk of the liquid, at the solid-liquid interface or at the triple line. The bulk dissipation (3D) is mostly due to the viscosity and it can be eliminated in the quasi-static limit of low velocity, however, the interfacial (2D) and triple line (1D) dissipation cannot be eliminated completely and both contribute to CA hysteresis.

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