wetting angle

wetting angle

[′wed·iŋ ‚aŋ·gəl]
(fluid mechanics)
A contact angle which lies between 0 and 90°.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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For oil films with the same length 40 [micro]m, the wetting angle is set at 30[degrees], 45[degrees], and 60[degrees] since initial wettability differs.
Using the known values [[gamma].sub.L], [[gamma].sup.LW.sub.L], [[gamma].sup.+.sub.L], and [[gamma].sup.-.sub.L] for test liquids and cosines of wetting angle on surfaces, we can construct a plane in the coordinates ([square root of ([[gamma].sup.LW.sub.L])]/[square root of ([[gamma].sup.-.sub.L])]; ([[gamma].sup.+.sub.L])]/[square root of ([[gamma].sup.-.sub.L])]; [[gamma].sub.L] (1 + cos [theta])/2[square root of ([[gamma].sup.-.sub.L])]) and then calculate the value of, and [[gamma].sup.-.sub.S].
where [theta] represents the wetting angle and [[sigma].sub.gs], [[sigma].sub.gl], and [[sigma].sub.ls] represent the interfacial tensions between the solid-gas, liquid-gas, and liquid-solid interfaces separately.
The wetting angle, as very important parameter, can be used to determine surface energy and adhesion.
Generally, the surface condition of the sphere, for example, static wetting angle, can dramatically affect the water entry phenomenon.
Regardless of the method used, any contact angle less than 90[degrees] represents a wettable/hydrophilic surface, while a hydrophobic surface wetting angle is greater than 90[degrees] (see Figure 1).
Limiting wetting angle of batch material compacted under a pressure of 20 MPa ([empty set] 12, height: 4 mm) was determined from the profile of water droplets thereon (Voyutsky, 1964).
It has also been observed that the emission of drops depends to a great extent on the static wetting angle, that is, the angle that the drop makes with the contact surface.
Abstract: This paper presents some wetting angle calculation methods.
Keywords: Polymer, degradation, simulation, Monte Carlo, gloss, fracture toughness, wetting angle
Figure 3b shows the wetting force as a function of the wetting angle after 2 seconds.
The addition of In to Sn-Zn eutectic leads to a lower wetting angle on Ni and Cu substrates .

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