Drying of salt solutions in porous materials: Intermediate-time dynamics and efflorescence

被引：58

作者：

Guglielmini, Laura ^{[1
]}

Gontcharov, Alexandre ^{[1
]}

Aldykiewicz, Antonio J., Jr. ^{[2
]}

Stone, Howard A. ^{[1
]}

机构：

[1] Harvard Univ, SEAS, Cambridge, MA 02138 USA

[2] Grace Construct Prod, Cambridge, MA 02140 USA

来源：

PHYSICS OF FLUIDS | 2008年 / 20卷 / 07期

关键词：

D O I：

10.1063/1.2954037

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Drying of salt solutions leads to the accumulation of salt at any surface where evaporation occurs. When this drying occurs within porous media, the precipitation of salts or efflorescence is generally to be avoided. A one-dimensional model for the drying processes in initially saturated porous materials was presented by Huinink [Phys. Fluids 14, 1389 (2002)] and analytical results were obtained for short times when the concentration distribution evolves diffusively. Here, we present analytical results for intermediate times when convective and diffusive fluxes balance. Moreover, the approach is extended to symmetrical geometries and is generalized for porous objects with arbitrary shape, which highlights the role of the surface area to volume ratio. Estimates for the Peclet number dependence of the maximum salt concentration at the surface are obtained and the conditions that allows to avoid efflorescence are characterized. (C) 2008 American Institute of Physics.

引用

页数：7

共 14 条

[1] SOLUTE TRANSFER DURING DRYING BY CONVECTION [J].