| 小尺度含水层热量运移试验研究及热弥散效应评估 |
| |
| 引用本文： | 刘国庆,周志芳,李兆峰,周彦章.小尺度含水层热量运移试验研究及热弥散效应评估[J].岩土力学,2015,36(1):171-177. |
| |
| 作者姓名： | 刘国庆 周志芳 李兆峰 周彦章 |
| |
| 作者单位： | 1. 河海大学 地球科学与工程学院，江苏 南京 210098；2. 南京水利科学研究院，江苏 南京 210029 |
| |
| 基金项目： | 国家自然科学基金项目资助(No.41402217,No.41172204);中国博士后科学基金(No.2014M561686);中央级公益性科研院所基本科研业务专项基金(No.Y313002) |
| |
| 摘 要： | 将小尺度含水层热机械弥散系数模型应用于对流弥散传热过程中,推导了该条件下对流弥散热量运移的解析解,结合试验进行验证,对含水层热弥散效应进行评估,结果表明,热机械弥散系数等于1×10-2 W/(m·°C)可以作为热弥散对温度场影响的临界点,从而将热机械弥散系数的分布划分为不可忽略的三角区域和可以忽略的多边形区域;明确了自然含水层结构条件下纵向热弥散度范围,从小尺度的热弥散研究结果来看,纵向热弥散度最大值为厘米数量级,它与野外大尺度条件下热弥散度的研究成果有着显著差异,表明热弥散尺度效应的存在,这将是进一步开展研究工作的方向。
|
| 关 键 词： | 小尺度 热机械弥散 热弥散效应 含水层 热量运移 |
| 收稿时间： | 2013-08-18 |
Experimental study of heat transfer and thermal dispersion effect assessment in small scale aquifer |
| |
| LIU Guo-qing;ZHOU Zhi-fang;LI Zhao-feng;ZHOU Yan-zhang.Experimental study of heat transfer and thermal dispersion effect assessment in small scale aquifer[J].Rock and Soil Mechanics,2015,36(1):171-177. |
| |
| Authors: | LIU Guo-qing;ZHOU Zhi-fang;LI Zhao-feng;ZHOU Yan-zhang |
| |
| Institution: | 1. School of Earth Science and Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210029, China |
| |
| Abstract: | This paper uses a thermo-mechanical dispersion coefficient model in a small-scale aquifer to examine the advection- dispersion heat transfer process. Analytical solutions of advection-dispersion are derived and proved their correctness with experiment. The assessment results show that the coefficient of the thermal-mechanical dispersion of 1×10-2 W/(m?°C) can be selected as the critical point where thermal transport is affected. The distribution of thermal mechanical dispersion coefficients can be divided into non-ignorable triangular domain and ignorable polygon domain. The calibration scope of longitudinal dispersion degree of natural flow field is made clear in different aquifers. However, the research result of small scale thermal dispersion show that, under condition that the particle diameter and the seepage velocity are both at the upper limit, the maximum of longitudinal thermal dispersion degree is at centimeter order of magnitude, which is significantly different from the research result of thermal dispersion degree under outdoors of large scale conditions. This proves the existence of scale effect of thermal dispersion, and thus shows the direction of further research. |
| |
| Keywords: | small-scale thermo-mechanical dispersion thermal dispersion effect aquifer heat transfer |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
