| Title: | A Knudsen diffusion model for predicting VOC emissions from porous wood-based panels based on porosimetry tests |
| Author(s): | Zhang Y; Xu N; Liu Z; Bai Y; Wu C; Guo Z; |
| Address: | "School of Science Beijing, University of Civil Engineering and Architecture, Beijing, 100044, China. zhangyan1@bucea.edu.cn. Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China. zhangyan1@bucea.edu.cn. School of Science Beijing, University of Civil Engineering and Architecture, Beijing, 100044, China. Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China. Overseas Chinese College, Capital University of Economics and Business, Beijing, 100070, China. Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China. China Building Material Test & Certification Group Co., Ltd, Beijing, 100024, China" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-022-24456-w |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "Volatile organic compounds (VOCs) emitted from porous wood-based panels with fractal structure severely pollute indoor environment. Different from previous studies which the diffusion type of VOC in building materials is attributed to Fick diffusion, VOC emission from porous wood-based panels belongs to Knudsen diffusion is firstly determined by comparing the pore diameter of internal channel with VOC molecular free path in this paper. Therefore, a time fractional mass transfer model related to the fractal dimension has been proposed to analyze Knudsen diffusion characteristics firstly. This model considers areal porosity has an impact on surface emission. Analytical solution of the present model is obtained for the first time. Furthermore, it is proved that the finite difference scheme is solvable, unconditionally stable, and convergent, and numerical simulation result and experimental data match well. Moreover, the influences of the fractal dimension d(f), areal porosity epsilon, and delay time parameter lambda on VOC emission are demonstrated and analyzed; results suggest that the higher epsilon and d(f), and lower lambda promote VOC emission, which can provide guidance for improving indoor air quality" |
| Keywords: | "Wood/chemistry *Volatile Organic Compounds/analysis Porosity Construction Materials *Air Pollution, Indoor/analysis Fractal dimension Knudsen diffusion Time fractional mass transfer model VOCs emission Wood-based panels;" |
| Notes: | "MedlineZhang, Yan Xu, Ning Liu, Ziyan Bai, Yu Wu, Chuandong Guo, Zhongbao eng 21878018/Innovative Research Group Project of the National Natural Science Foundation of China/ 22178022/Innovative Research Group Project of the National Natural Science Foundation of China/ Germany 2022/12/14 Environ Sci Pollut Res Int. 2023 Mar; 30(12):34598-34611. doi: 10.1007/s11356-022-24456-w. Epub 2022 Dec 14" |
