Leveling of thixotropic liquids

Livescu, Silviu; Roy, Rupa; Schwartz, Leonard W.

doi:10.1016/j.jnnfm.2011.01.010

Cited by 17 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, these investigations were highly ideal because they neglected the dependence of coating viscosity on shear rate, the effects of thixotropy, and the presence of solvent evaporation [10]. Later, 1995-2011, leveling studies were focused in different directions: numerical simulation of the Marangoni-effect on leveling of a two component fluid [19], the thixotropic effect on leveling [20,21], and leveling of thermoset waterborne coatings [22,23].…”

Section: Leveling Of Coatingsmentioning

confidence: 99%

Leveling measurements of antifouling coatings using an optical profilometer: Effects of additives and solvent concentration and type

Wang

Weinell

Tobar³

et al. 2019

Progress in Organic Coatings

View full text Add to dashboard Cite

Ship hulls require smooth antifouling coating surfaces to decrease frictional drag and avoid sites of weakness for biofouling. Consequently, the leveling properties of antifouling coatings should be understood and optimized. In the present work, a novel approach to quantitatively measure leveling properties of coating films was developed. Using this approach, dynamic surface textures during leveling of selected model antifouling formulations were measured using a combination of a threedimensional (3D) profilometer and a retrofitted automatic film application system. It was found that the leveling process is strongly coupled to the solvent evaporation rate and the associated development in coating viscosity. For low viscous coatings, three leveling stages were observed. High viscous coatings, on the other hand, only went through one leveling stage. Experimental data showed that an underlying tie-coat (relative to a flat acrylic panel) had negative effects on the smoothness of the top coat. In addition, using an anti-sagging agent enabled control of sagging, but resulted in negative effects on leveling. Nevertheless, it was still possible to obtain good leveling performance with anti-sagging agent in a formulation.The effects of minor amounts of three types of additives and two types of solvents on leveling of the model formulations (drawdown application) were found to be less significant than those seen during (and after) spraying application. It is therefore important to take into account the application method when studying leveling phenomena.

show abstract

Section: Leveling Of Coatingsmentioning

confidence: 99%

Leveling measurements of antifouling coatings using an optical profilometer: Effects of additives and solvent concentration and type

Wang

Weinell

Tobar³

et al. 2019

Progress in Organic Coatings

View full text Add to dashboard Cite

show abstract

“…In this work, he was able to model the behavior of sludge using a unique equation which consisted of a solid and liquid component as well as a structural parameter, λ, measured as a function of time, to characterize the time-dependency of sludge. This parameter had also been adopted by several other researchers to develop thixotropic model that can be used to characterize time-dependent behavior of yield stress fluids (Labanda et al, 2004;Dullaert and Mewis, 2005;Alexandrou et al, 2009;Mewis and Wagner, 2009;Livescu et al, 2011).…”

Section: Thixotropymentioning

confidence: 99%

Rheological characterisation of municipal sludge: A review

et al. 2013

View full text Add to dashboard Cite

Sustainable sludge management is becoming a major issue for wastewater treatment plants due to increasing urban populations and tightening environmental regulations for conventional sludge disposal methods. To address this problem, a good understanding of sludge behaviour is vital to improve and optimize the current state of wastewater treatment operations. This paper provides a review of the recent experimental works in order for researchers to be able to develop a reliable characterization technique for measuring the important properties of sludge such as viscosity, yield stress, thixotropy, and viscoelasticity and to better understand the impact of solids concentrations, temperature, and water content on these properties. In this context, choosing the appropriate rheological model and rheometer is also important.

show abstract

“…The spherical RT instability of a water droplet induced by internal volume oscillation has attracted much attention and is very important for industrial applications such as premixed combustion (Chertkov, Lebedev & Vladimirova 2009), underwater explosion (Geers & Hunter 2002) and industrial coating with thin liquid films (Livescu & Schwartz 2011). The volume oscillation inside a droplet is induced by expansion and contraction of a cavitation bubble, which is commonly generated by a pulsed laser and electric discharge.…”

Section: Introductionmentioning

confidence: 99%