TY - JOUR
TI - Study on the surface morphology and fractal characteristics of granite under thermal shock of seawater
AU - Deng Hu-Chao
AU - Hu Jian-Jun
AU - Liu Gui-Kang
AU - Ye Si-Qi
AU - Sun Da-Li
JN - Thermal Science
PY - 2023
VL - 27
IS - 1
SP - 571
EP - 579
PT - Article
AB - Geothermal energy has become one of the new energy sources of great concern  due to its wide distribution, abundant reserves and green, clean and  renewable advantages. In view of the advantages of both geothermal energy  development potential and abundant seawater reserves in the coastal areas,  granite is taken as the research object, and the surface topography under  different temperatures (100°C, 200°C, 300°C, 400°C, and 500°C) and  different thermal shock cycles (0, 5, 10, 15 and 20) is obtained. Based on  3-D scanning technology, the damage details of the surface are  reconstructed, and the roughness parameters of the surface are obtained. The  maximum height, the maximum valley depth and the arithmetic mean height  increase with the increase of the temperature and the number of times, but  the maximum peak height does not change significantly. Based on fractal  theory, the variation law of the fractal dimension is further discussed. The  impact regions that affect the fractal dimension and thermal damage are  divided: the weak impact region, the transition region, and the significant  impact region. It lays a corresponding basic law for the heat exchange  efficiency and strength characteristics of dry hot rock.