Wetting partial

Telia F D, Ercolessi F and Tosatti E 1995 Maximum overheating and partial wetting of nonmelting solid surfaces Phys. Rev. Lett. 74 3201... 

Dust-tight electrical systems should be used in areas where activated carbon is present, particularly powdered products (66). When partially wet activated carbon comes into contact with unprotected metal, galvanic currents can be set up these result in metal corrosion (67). 

Use of solutions, slurries, pellets, granules or dust-free (i.e. partially-wetted) powders instead of dry powders. 

K. Sekimoto, R. Oguma, K. Kawasaki. Morphological stability analysis of partial wetting. Ann Phys 776 359-392, 1987. 

The theory of seaweed formation does not only apply to solidification processes but in fact to the completely different phenomenon of a wettingdewetting transition. To be precise, this applies to the so-called partial wetting scenario, where a thin liquid film may coexist with a dry surface on the same substrate. These equations are equivalent to the one-sided model of diffusional growth with an effective diffusion coefficient which depends on the viscosity and on the thermodynamical properties of the thin film. 

Pseudo-partial wetting if 5 > 0 and P < 0. A macroscopic droplet with a finite contact angle can form on top of a flat film, while a microscopic droplet will spread to form a pancake or a diluted gas. 

Partial wetting if 5 < 0. The droplets make a finite contact angle. 

Partial-wet recently discontinued fork-lift trucks 8... 

Sedricks, W and Kenney, C. N., Partial wetting in trickle bed reactors—the reduction of crotonaldehyde over a palladium catalyst. Chem. Eng. Sci. 28, 558-1261 (1973). 

Equation (6.39) was first derived by Young, and is often referred to as the Young-Dupre equation. We usually distinguish between full (6< 90°) and partial wetting (0 > 90°) and an alternative measure of the same property is given by the wetting coefficient ... 

The increasing use of disposable paper towels and wipes in chemical laboratories accentuates the potential fire hazards arising from the disposal of solid oxidising agents or reactive residues into a bin containing such towels or wipes. The partially wet paper, necessarily of high surface area and absorbency, presents favourable conditions for a fire to be initiated and spread. Separate bins for paper towels etc., and chemical residues seem advisable. 

The partial wetting of a melt on a low-index plane of its solid has already been predicted - and observed on Cd", Ga , Ge, NaCT and KCl . However, as mentioned earlier, indications of anisotropic wetting have been limited to Ge and icel In the case of Pb, the wetting angle is shown to increase as the surface free energy, or the atomic density of the surface plane, decreases. Germanium was quoted as having a similar behaviouf. 

Partial wet oxidation or controlled wet oxidation is, in a sense, similar to that of catalytic oxidation. Catalytic oxidation provides a conventional catalyst in order to boost and control the oxidative reaction, whereas wet oxidation provides a favored atmosphere for the reaction to occur. More accurately, catalytic oxidation provides a surface upon which intimate contact between the reactants takes place compared to the thermodynamic (or fluid dynamic) contact provided by wet oxidation. In wet oxidation, it can be said that the supercritical water phase acts as the "catalyst for the reaction. 

Explain why it is possible to make sandcastles only in partially wet sand and not in either fully immersed or completely dry sand. 

Figure 1.79 Interaction of a liquid droplet with a solid substrate (a) Partially wetting (0° < 6> < 180°), (b) completely wetting (6> 0°), and (c) completely nonwetting 0 = 180°).

When the surface of a solid is only partially wetted by a liquid, it forms a droplet with a definite contact angle (0). The interaction of the components is expressed by the Young equation ... 

Failing to identify the limiting reactant can lead to failure in the scale-up of trickle-bed reactors (Dudukovic, 1999). Gas-limited reactions occur when the gaseous reactant is slightly soluble in the liquid and at moderate operating pressures. For liquid-limited reactions, concurrent upflow is preferred (packed bubble columns) as it provides for complete catalyst wetting and thus enhances the mass transfer from the liquid phase to the catalyst. On the other hand, for gas reactions, concurrent downflow operation (trickle-bed reactors), especially at partially wetted conditions, is preferred as it facilitates the mass transfer from the gas phase to the catalyst. The differences between upflow and downflow conditions disappear by the addition of fines (see Section 3.7.3, Wetting efficiency in trickle-bed reactors). 

Sensitivity. 1) B.D. Pollock R.F. Gentner, Impact Sensitivity of Wetted Primary Explosives as Determined by the Ball Drop Test , PATR 4311 (1972) [Table 8 lists the impact sensy data found by these workers on unconfined dry and w-wet Pb Azide. Addnly, they found that w completely desensitized Pb Styphnate and Tetracene and that all fully-wetted unconfined primary expls were less sensitive to impact than when dry, but that partially wet (w-soaked but no excess of w present) confined initiating expls are more sensitive to impact than when fully dried... 

Trickle flow All data Partial wetting data ... 

The adsorption of block copolymers from a selective solvent was considered by Ligoure (1991). He predicted the existence of surface micelles (see Fig. 3.22) in the case when the block interacting unfavourably with the solvent only partially wets the surface. The model predicts a critical surface micellar concentration (csmc) that differs from the bulk cmc. When the contact angle, which characterizes the interfacial interactions between the copolymer, adsorbing surface, and solvent is lower than some universal value, surface micelles were predicted to appear at a lower copolymer concentration than bulk ones. Experimental results on surfaces are discussed in Section 3.8.4. 

Air inlet louvers can sometimes be discolored by white deposits as a result of total evaporation of solids in cooling water partially wetting the louvers. 

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