Device and method for measuring humidity physical properties of porous materials
A technology of porous materials and measuring devices, applied in measuring devices, analysis of suspensions and porous materials, analysis of materials, etc., can solve problems such as reducing indoor air quality, moisture condensation on wall surfaces, and shortening the service life of building components
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[0020] The invention can complete the measurement of the water vapor effective diffusion coefficient and isothermal moisture absorption curve of the porous material sample. The measurement principle is as follows:
[0021] Based on the physical model of water vapor transient one-dimensional diffusion, such as figure 1 , the initial water vapor density inside the sample is consistent and a constant value ρ 0 . When the experiment starts, the ambient water vapor density on the boundary of one end of the sample (x=0) suddenly increases and will remain at ρ 1 (>ρ 0 ), while the ambient water vapor density on the boundary of the other end of the sample is always kept as ρ 0 . Afterwards, driven by this water vapor density difference, the moisture will conduct one-dimensional conduction along the positive direction of the x-axis inside the sample. The relative humidity distribution inside the sample at a certain time will be as figure 1 shown by the dotted line. The relation...
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