Abstract
We have studied the imbibition of water from a stationary nozzle into thin, moving porous media that are suspended in air, as well as the accompanying evaporation and condensation processes. Due to sorptive heating and the latent heat associated with the phase change processes, the temperature of the porous medium becomes non-uniform. We have measured the temperature distributions using infrared thermography as a function of substrate speed. Moreover, we developed a numerical model coupling Darcy flow and heat transfer in the thin porous medium with gas flow, heat and water vapor transport in the surrounding gas phase. The numerical simulations reproduce the measurements very well and point at an intricate buoyancy-induced gas-phase convection pattern.
| Original language | English |
|---|---|
| Article number | 118875 |
| Number of pages | 10 |
| Journal | International Journal of Heat and Mass Transfer |
| Volume | 147 |
| DOIs | |
| Publication status | Published - Feb 2020 |
Funding
This work is part of the research programme ‘ The role of surfactants in spreading, imbibition and sorption of water-based printing inks ’ with project number 14666, which is (partly) financed by the Netherlands Organisation for Scientific Research (NWO). The authors thank Nicolae Tomozeiu, Herman Wijshoff and Louis Saes of Océ - A Canon Company for the fruitful cooperation.
Keywords
- Heat of wetting
- Infrared thermography
- Moisture distributions
- Porous media
- Sorption