Experimental determination of the water vapor diffusion coefficient of autoclaved aerated concrete (AAC) via a transient method: Effects of the porosity and temperature
| Autor: | Xu Xu, Jia-Hui Fu, Yi Siyang, Li-Wu Fan, Zi-Tao Yu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Fluid Flow and Transfer Processes
Pore size Materials science 020209 energy Mechanical Engineering Diffusion 0211 other engineering and technologies Analytical chemistry 02 engineering and technology Condensed Matter Physics 021105 building & construction 0202 electrical engineering electronic engineering information engineering Relative humidity Transient (oscillation) Autoclaved aerated concrete Porosity Water vapor |
| Zdroj: | International Journal of Heat and Mass Transfer. 103:607-610 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2016.07.111 |
| Popis: | In this Short Communication, the water vapor diffusion coefficient of autoclaved aerated concrete (AAC) samples with various apparent densities was measured using a transient method that is based upon solving an inverse problem of one-dimensional water vapor diffusion. The transient measurements were performed over a relative humidity (RH) range from 1% to 90% at temperatures between 15 °C and 45 °C. It was revealed that the dependence of water vapor diffusion coefficient on the presence of pores cannot be simply correlated to either apparent porosity or open porosity. The pore structure, as quantified by pore size distribution, was found to be responsible for the relative comparison among the various AAC samples. It was also exhibited that the water vapor diffusion coefficient is enhanced at higher temperatures, whereas its RH-dependence is significantly suppressed at lower temperatures. |
| Databáze: | OpenAIRE |
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