扩散时间对经典模型扩散系数影响研究

doi:10.16265/j.cnki.issn1003-3033.2020.02.010

摘要/Abstract

摘要： 为研究时间因素对扩散系数拟合计算的影响,基于经典扩散模型分析其拟合过程中的理论误差,并选用不同时间段及时间间隔的颗粒煤瓦斯扩散动力学试验数据,通过常规及定截距 2种线性拟合方式分析扩散系数及确定系数R²随时间的变化趋势。结果表明:拟合理论误差随着扩散时间延长而降低,常规拟合和定截距拟合计算得到的扩散系数随着扩散时间的延长而趋于相同,但两者得到的扩散系数随时间段、时间间隔增大呈现不同变化特征,并受到0点数据的影响。

关键词: 瓦斯扩散系数, 经典扩散模型, 扩散时间, 线性拟合, 定截距

Abstract: In order to study influence of time factor on fitting and calculation of diffusion coefficient, theoretical error during fitting process was analyzed based on classical diffusion model. Then, variation trends of diffusion coefficient and determination coefficient R² over time were analyzed through conventional and fixed intercept linear methods with experimental data of gas diffusion dynamics in coal particles at different time periods and intervals. The results show that theoretical error of fitting decreases as diffusion time extends, and diffusion coefficient calculated by conventional fitting and fixed intercept fitting tends to be the same over time. However, it varies a lot with the increase of time period and interval and is affected by data at zero time.

Key words: gas diffusion coefficient, classical diffusion model, diffusion time, linear fitting, fixed intercept

中图分类号:

X936

张宪尚. 扩散时间对经典模型扩散系数影响研究[J]. 中国安全科学学报, 2020, 30(2): 60-65.

ZHANG Xianshang. Influence of time factor on diffusion coefficient based on classical model[J]. China Safety Science Journal, 2020, 30(2): 60-65.

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