Abstract
We have studied the deposition of lines of water onto a thin porous medium by means of a droplet-on-demand, single-nozzle inkjet system. We systematically varied the substrate speed and the droplet frequency. Optical transmission imaging was used to measure the dynamic moisture distribution in the substrate in conjunction with infrared thermography to determine the in-plane temperature distribution of the paper. The temperature of the paper becomes non-uniform due to evaporative cooling. Furthermore, we have developed a two-dimensional model coupling the Richards equation for moisture transport in unsaturated porous media with evaporative mass loss and heat transfer. The results of the numerical simulations agree qualitatively well with the measured data.
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