Validity of Assuming Equilibrium Between Liquid Water and Vapor for Simulating Evaporation
Validity of Assuming Equilibrium Between Liquid Water and Vapor for Simulating Evaporation
复制标题
假设液态水和蒸汽之间平衡来模拟蒸发的有效性
作者：
M. Novak
蒸发理论中的标准假设，即土壤中任何位置的水蒸气密度都等于与液态水的热力学平衡值，最近受到了质疑。本文定义了土壤蒸发过程中发生不平衡的精确标准。在这样做的物理为基础的模型的孔隙传递系数的关键量化的非平衡程度的开发。各种土壤质地和温度条件下，包括极端情况下的地表火灾，偏离平衡假设的可能性。此外，孔隙传递系数被纳入稳态非平衡模拟的蒸发从粗砂在现场条件下，并与相应的平衡模拟比较。在狭窄的地下蒸发区之外，非平衡和平衡模拟之间没有显着差异。由于非平衡效应最有可能被视为与粗砂放弃标准假设在未来的工作是不必要的，和所有以前的工作，基于它不需要质疑。
The standard assumption used in evaporation theory that at any location in a soil water vapor density is equal to the value in thermodynamic equilibrium with the liquid water has recently been questioned. This paper defines precise criteria for nonequilibrium to occur during evaporation in soils. In doing so a physically based model of the pore transfer coefficient critical to quantifying the degree of nonequilibrium is developed. The likelihood of departure from the equilibrium assumption for various soil textures and temperature conditions, including the extreme case of surface fire, is presented. Furthermore the pore transfer coefficient is incorporated into steady‐state nonequilibrium simulations of evaporation from a coarse sand under field conditions and compared with the corresponding equilibrium simulation. Outside of the narrow subsurface evaporation zone there were no significant differences between the nonequilibrium and equilibrium simulations. Since nonequilibrium effects were most likely to be seen with the coarse sand abandoning the standard assumption in future work is unnecessary, and all previous work based on it need not be questioned.
影响因子：
3.6
作者：
Dalla, E;Hilpert, M;Miller, CT
通讯作者：
Miller, CT