Symmetric and asymmetric coalescence of droplets on a solid surface in the inertia-dominated regime
| Autor: | Sasidhar Kondaraju, Supreet Singh Bahga, Sunil R. Kale, Nilesh D. Pawar |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Coalescence (physics) Physics Surface (mathematics) Mechanical Engineering media_common.quotation_subject Solid surface Computational Mechanics Lattice Boltzmann methods Condensed Matter Physics Inertia 01 natural sciences Molecular physics 010305 fluids & plasmas Physics::Fluid Dynamics Contact angle Mechanics of Materials 0103 physical sciences Wetting 010306 general physics media_common Dimensionless quantity |
| Zdroj: | Physics of Fluids. 31:092106 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.5119014 |
| Popis: | We present an investigation of symmetric and asymmetric coalescence of two droplets of equal and unequal size on a solid surface in the inertia-dominated regime. Asymmetric coalescence can result due to the coalescence of two unequal-sized droplets or coalescence of two droplets having different contact angles with the surface due to a step gradient in wettability. Based on the solution of an analytical model and lattice Boltzmann simulations, we analyze symmetric and asymmetric coalescence of two droplets on a solid surface. The analysis of coalescence of identical droplets show that the liquid bridge height grows with time as (t*)1/2 for θ = 90° and (t*)2/3 for θ < 90°, where t* is dimensionless time. Our analysis also yields the same scaling law for the coalescence of two unequal-sized droplets on a surface with homogeneous wettability. We also discuss the coalescence of two droplets having different contact angles with the surface due to a step gradient in wettability. We show that the prediction of bridge height with time scales as (t*)2/3 irrespective of contact angles of droplet with the surface.We present an investigation of symmetric and asymmetric coalescence of two droplets of equal and unequal size on a solid surface in the inertia-dominated regime. Asymmetric coalescence can result due to the coalescence of two unequal-sized droplets or coalescence of two droplets having different contact angles with the surface due to a step gradient in wettability. Based on the solution of an analytical model and lattice Boltzmann simulations, we analyze symmetric and asymmetric coalescence of two droplets on a solid surface. The analysis of coalescence of identical droplets show that the liquid bridge height grows with time as (t*)1/2 for θ = 90° and (t*)2/3 for θ < 90°, where t* is dimensionless time. Our analysis also yields the same scaling law for the coalescence of two unequal-sized droplets on a surface with homogeneous wettability. We also discuss the coalescence of two droplets having different contact angles with the surface due to a step gradient in wettability. We show that the prediction of b... |
| Databáze: | OpenAIRE |
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