We study the consequences of drying on the internal structure of compressible materials containing pores of different sizes, which may be seen as model systems of sponges or wood. With the help of original techniques, we devised bi-porous media with different relative amounts of small and large pores, and follow the evolution of the liquid fraction simultaneously in each pore type. We show that in a compressible bi-porous medium with dispersed large pores (i.e. not directly connected) drying induces the homogeneous emptying of the large pores first, due to their compression, along with some compression of the small pore matrix. On the contrary, when the large pores are connected, the large pores successively empty without compression. In both cases, the small pores start or finish to empty in the next stage, and a constant drying rate is observed during most of the time, thanks to liquid films maintaining the contact of the liquid network with the free surface of the sample.

中文翻译：

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干燥可压缩的双孔材料

我们研究了干燥对含有不同大小孔隙的可压缩材料内部结构的影响，这可以看作是海绵或木材的模型系统。在原始技术的帮助下，我们设计了相对大小不同的小孔和大孔的双孔介质，并同时跟踪每种孔类型中液体组分的演变。我们表明，在具有分散的大孔（即不直接连接）的可压缩双孔介质中，干燥首先导致大孔的均匀排空，这是由于它们的压缩以及小孔基质的一些压缩。相反，当连接大孔时，大孔连续排空而没有压缩。在这两种情况下，小毛孔都会在下一阶段开始或逐渐变空，