Spreading of liquid drops over porous substrates

Starov, Victor; Zhdanov, S.A.; Kosvintsev, Serguei R.; Соболев, В. Д.; Velarde, Manuel G.

doi:10.1016/s0001-8686(03)00039-3

Cited by 117 publications

(93 citation statements)

References 26 publications

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“…Surprisingly the latter process drew the attention of a scientific community relatively recently (see recent reviews on the subject [35][36]). A schematics of the process presented in Fig.…”

Section: Spreading Over Porous Substratesmentioning

confidence: 99%

Surface forces action in a vicinity of three phase contact line and other current problems in kinetics of wetting and spreading

Starov

2010

Advances in Colloid and Interface Science

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Section: Spreading Over Porous Substratesmentioning

confidence: 99%

Surface forces action in a vicinity of three phase contact line and other current problems in kinetics of wetting and spreading

Starov

2010

Advances in Colloid and Interface Science

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“…Therefore, the model was able to mimic the contactline pinning phenomena observed in experiments. Starov et al [20] studied the spreading of small liquid drops over thin and thick porous layers in the cases of both complete wetting and partial wetting. The porous substrates in their experiments included nitrocellulose membranes of different porosity and different average pore size, glass, and metal filters.…”

Section: Introductionmentioning

confidence: 99%

“…The others [14,15,20,21,24,25] studied the spreading and permeating integrally. The separate and competitive mechanisms of the spreading and permeation processes are still unclear, which motivates the present study.…”

Section: Introductionmentioning

confidence: 99%

Droplet spreading and permeating on the hybrid-wettability porous substrates: a lattice Boltzmann method study

Wenkai

et al. 2016

Open Physics

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Abstract:The spreading and permeation of droplets on porous substrates is a fundamental process in a variety of applications, such as coating, dyeing, and printing. The spreading and permeating usually occur synchronously but play different roles in the practical applications. The mechanisms of the competition between spreading and permeation is significant but still unclear. A lattice Boltzmann method is used to study the spreading and permeation of droplets on hybrid-wettability porous substrates, with different wettability on the surface and the inside pores. The competition between the spreading and the permeation processes is studied in this work from the effects of the substrate and the fluid properties, including the substrate wettability, the porous parameters, as well as the fluid surface tension and viscosity. The results show that increasing the surface wettability and the porosity contact angle both inhibit the spreading and the permeation processes. When the inside porosity contact angle is larger than 90 ∘ (hydrophobic), the permeation process does not occur. The droplets suspend on substrates with Cassie state. The droplets are more easily to permeate into substrates with a small inside porosity contact angle (hydrophilic), as well as large pore sizes. Otherwise, the droplets are more easily to spread on substrate surfaces with small surface contact angle (hydrophilic) and smaller pore sizes. The competition between droplet spreading and permeation is also related to the fluid properties. The permeation process is enhanced by increasing of surface

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“…In addition to the measurement of static surface wettability properties, namely the contact angle described above, the dynamic spreading of a water droplet on flat, rough or porous surfaces has also been studied quite extensively [1,2,3,4,7,14,15]. Most investigations have addressed the evolution of a liquid droplet over time, and it is believed that the radius of the droplet R versus time obeys a simple power law, R ∝ t α , where α is the characteristic of a spreading regime due to a specific underlying physical mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Most investigations have addressed the evolution of a liquid droplet over time, and it is believed that the radius of the droplet R versus time obeys a simple power law, R ∝ t α , where α is the characteristic of a spreading regime due to a specific underlying physical mechanism. For example, for a flat surface, α usually takes a value between 1 / 10 and 1 / 8 , depending on whether the dominant driving force is the capillary force or the gravitational force [1,2,3,4,6,7,14,15]. For a rough or porous surface, the spreading process becomes more complex and therefore, parameters such as the roughness or porosity of the substrate and the viscosity of the liquid have to be considered.…”

Section: Introductionmentioning

confidence: 99%