Experimental study of heat transfer by water flowing through smooth and rough rock fractures

被引：36
作者：
Luo, Yinfei [1 ,2 ,3 ,4 ,5 ]
Xu, Weilin [1 ,2 ,4 ,5 ]
Lei, Yude [1 ,2 ,4 ,5 ]
Wu, Ping [1 ,2 ,4 ,5 ]
Qin, Guangxiong [1 ,2 ,4 ,5 ]
Ba, Ruishou [1 ,2 ,4 ,5 ]
机构：
[1] Key Lab Geoenvironm Qinghai Prov, Xining 810007, Qinghai, Peoples R China
[2] Environm Geol Prospecting Bur Qinghai Prov, Xining, Qinghai, Peoples R China
[3] China Univ Geosci, Sch Water Resources & Environm, Beijing 100083, Peoples R China
[4] Geol Environm Protect & Disaster Prevent Engn Tec, Xining, Qinghai, Peoples R China
[5] Qinghai 906 Engn Invest & Design Inst, Xining 810007, Qinghai, Peoples R China
来源：
ENERGY REPORTS | 2019年 / 5卷
关键词：
Heat transfer; Enhanced geothermal system; Rock fracture; TRANSFER COEFFICIENT; FLUID;
D O I：
10.1016/j.egyr.2019.07.018
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
It is important to have an accurate understanding of heat transfer process of water flowing through fractures for geothermal energy extraction and utilization. We designed an experiment to study the convective heat transfer characteristics of distilled water pumped through manmade smooth and rough fractures in granite samples. The flow velocity, permeating pressure, confining pressure, inlet and outlet fluid temperature and rock outer-surface temperature were measured and recorded to calculate the heat transfer coefficient. The effects of volumetric flow rate, fracture surface roughness, and outer wall surface temperature on the convective heat transfer process were analyzed. The results indicate that fracture surface roughness has a great influence on the heat transfer characteristics of water flowing through rocks. Overall heat transfer intensity improved along with an increase in rock fracture surface roughness. Our results have implications for geothermal energy extraction and utilization. (C) 2019 The Authors. Published by Elsevier Ltd.
引用
收藏
页码：1025 / 1029
页数：5
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