填充介质管道流动中标量输运过程机理的实验观测、数值模拟与理论分析研究

项目名称： 填充介质管道流动中标量输运过程机理的实验观测、数值模拟与理论分析研究

项目编号： No.11272012

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 陈国谦

作者单位： 北京大学

项目金额： 102万元

中文摘要： 填充介质管道流动中标量输运过程机理对于污染物控制等高新技术领域至关重要。鉴于目前对填充介质管道流动中标量输运过程的研究尚局限于相对简单的定常流动弥散阶段，本项目拟针对更为复杂的初始过渡段和周期性流动弥散段，基于变频流动控制与激光诱导荧光测量(LIF)技术，建造填充介质管道流动（包括最基本的圆管流和二维槽道流）输运过程综合实验台架，进行高分辨率分布式动态模拟实验观测；利用格子Boltzmann方法和随机游走粒子追踪方法，开发孔隙尺度上的大规模并行计算程序，进行高精度数值模拟；拓展经典的弥散理论分析方法，结合实验观测和数值模拟结果，确定过渡段的多尺度渐进规律和周期流动弥散机理。本研究综合运用实验观测、数值模拟与解析分析，把握填充介质管道流动中标量输运过程机理，可为相关应用领域提供基本科学依据和技术支持。

中文关键词： 填充介质流动；标量物质输运；实验观测；数值模拟；理论分析

英文摘要： Scalar transport processes in packed fube flows are of fundamental importance for applications such as the capture of fine particulates from the atmosphere, carbon capture and storage, ecological restoration and contaminant control in wetlands, etc. As existing researches focused only on the steady flow condition and the Taylor dispersion stage of the transport, the present project intends to take into account the periodic flow condition and the initial stage of the transport process in the most typical packed tube flows. The specific objectives of this study are (1) to establish an integrated experimental facility for the study of packed tube flow transport process, based on the variable frequency of flow control and the Laser Induced Fluorescence (LIF) techniques, and to conduct high-precision distributed dynamic experimental measurement to capture the concentration evolution behavior of scalar substances; (2) to develop massive parallel computational program based on the lattice-Boltzmann method for calculating the flow field and the random-walk particle-tracking method for capturing the tracer trajectory, and to carry out high precision numerical simulation for transport processes in packed tube flows; (3) to extend the classical Taylor dispersion analysis to determine the mechanism for the Taylor dispersion

英文关键词： Packed media flow；Scalar substances transport；Experimental measurement；Numerical simulation；Theoretical analysis