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DOI | 10.1029/2021WR029861 |
Impact of surface roughness on evaporation in 2D micromodels | |
Yi Ding; Helmut Geistlinger | |
2021-10-18 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Evaporation - a key process for water exchange between soil and atmosphere - is controlled by internal water fluxes and surface vapor fluxes. Recent studies demonstrated that the dynamics of the water flow in pore corners and thick-film flow on the rough pore-solid interface determine the time behavior of the evaporation rate. A comprehensive experimental study of the combined effect of corner flow (CF) and thick-film flow (TFF) on evaporation is lacking. Herein, we present a comparative micromodel study of the evaporation process using 2D-porous media, which exhibit the same stochastic pore structure, but different degree of surface roughness (silicon micromodels with smooth surface; glass-ceramic micromodels with rough surface). Our study proves both experimentally and theoretically that surface roughness and wettability play a key role for the time- and temperature behavior of the evaporation process. We found a similar -behavior up to 42°C regarding the mass loss as function of time in stage-2 and a transition to linear t-behavior for higher temperatures (61°C), with high statistical significance (regression coefficients near 1) for both micromodels. Our experimental results elucidate the strong temporal correlation between mass loss and geometric pattern of the unsaturated CF and TFF region. Partial wetting in silicon micromodels causes a weak driving force for CF, whereas complete wetting in glass-ceramic micromodels causes a strong driving force for TFF. For a consistent description of the time-dependent mass loss and geometry of the CF/TFF region, the fractality of the evaporation front must be considered. Based on our data we estimate the film-thickness and discover some interesting film thinning effect with increasing temperature. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/340963 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Yi Ding,Helmut Geistlinger. Impact of surface roughness on evaporation in 2D micromodels[J]. Water Resources Research,2021. |
APA | Yi Ding,&Helmut Geistlinger.(2021).Impact of surface roughness on evaporation in 2D micromodels.Water Resources Research. |
MLA | Yi Ding,et al."Impact of surface roughness on evaporation in 2D micromodels".Water Resources Research (2021). |
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