Wetting Line Dynamics in the Process of Drop Spreading

Voinov, O. V.

doi:10.1006/jcis.2000.6727

Cited by 9 publications

(1 citation statement)

References 13 publications

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“…Wetting of solid surfaces with liquids has wide applications in printing, painting, adhesion, lubrication, and spraying, and has attracted considerable research interest. − The time course of a drop radius ( R ) of a completely wetting fluid on a solid substrate is correlated using a simple power law, R ( t ) = at m , with m = 1/10 or m = 1/8 in the capillary spreading or in the gravitational spreading regime, respectively . Many studies of completely wetting Newtonian fluids agree with the above-mentioned theoretical prediction. − ,,,− ,,,− Blake, conversely, determined that m = 1/7 in the capillary regime based on a molecular kinetics approach.…”

Section: Introductionmentioning

confidence: 89%

Spreading of Completely Wetting or Partially Wetting Power-Law Fluid on Solid Surface

Zhang

Lee

et al. 2007

Langmuir

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This study investigated the drop-spreading dynamics of pseudo-plastic and dilatant fluids. Experimental results indicated that the spreading law for both fluids is related to rheological characteristics or power exponent n. For the completely wetting system, the evolution of the wetting radius over time can be expressed by the power law R = atm, where the spreading exponent m of the dilatant fluids is >0.1 and the spreading exponent m of pseudo-plastic fluids is <0.1. The strength of non-Newtonian effects is positively correlated to the extent of deviation from the theoretical value 0.1 of m for Newtonian fluids. For the partially wetting system, the power law on the time dependence of the wetting radius no longer holds; therefore, an exponential power law, R = Req(1-exp(-at(m)/Req)), is proposed, where Req denotes the equilibrium radius of drop and a is a coefficient. Comparing experimental data with the exponential power law revealed that both are in good agreement.

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