Abstract
Abstract
Highlights
Capillary flow is the spontaneous wicking of liquid in narrow spaces without the assistance of, or even in opposition to, external forces such as gravity
We investigate the effects of the complex free-surface morphology on the flow dynamics over a wide range of channel aspect ratios λ and equilibrium contact angles θ0 (§ 4.1) and identify limitations of the modified Lucas–Washburn (MLW) model (§ 4.2)
We investigate the effect of channel aspect ratio λ on the free-surface morphology by initially examining the profilometry scans in figures 3(a) and 3(c)
Summary
Capillary flow is the spontaneous wicking of liquid in narrow spaces without the assistance of, or even in opposition to, external forces such as gravity. This phenomenon has been investigated since the early twentieth century and has been exploited for a diverse range of applications including lab-on-a-chip devices (Olanrewaju et al 2018), heat pipes (Faghri 1995), propellant management devices in spacecrafts (Levine et al 2015) and fabrication of flexible printed electronics (Cao et al 2018; Jochem et al 2018). The mobility parameter kcan be thought of as a diffusion coefficient driving the growth of the liquid interface
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