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Experimental study of convective heat transfer characteristics of fractures with different morphologies based on fractal theory
- Source :
- Case Studies in Thermal Engineering, Vol 28, Iss, Pp 101499-(2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- In the Enhanced Geothermal System (EGS), the flow state of the fracture of the thermal reservoir (granite) is important for heat transfer. In this paper, the effects of reservoir temperature, flow rate and fracture shape on the thermal convection that occurs in the fracture of rough granite are studied based on the fractal dimension theory. The rough fracture is manufactured regularly by carving technology. The shear flow experiments were carried out at confining pressures of 10, 15 and 20 MPa to analyze the flow state. The convective heat transfer experiments were conducted at 60 and 70 °C to simulate different heat reservoir conditions. The results indicated that the outlet temperature and overall heat transfer coefficient (OHTC) increased with the increase in the rock temperature. A higher flow rate can enhance the thermal performance. The complexity of the fracture surface is also an important factor that affects the convective heat transfer process. The larger fractal dimension of the fracture surface can more easily excite turbulence, affecting the thickness of the boundary layer. The OHTC will increase as the fractal dimension increases.
- Subjects :
- Fluid Flow and Transfer Processes
Materials science
Thermal reservoir
Convective heat transfer
Turbulence
Enhanced geothermal system(EGS)
Hot dry rock (HDR)
Heat transfer coefficient
Mechanics
Engineering (General). Civil engineering (General)
Fractal dimension
Overall heat transfer coefficient (OHTC)
Physics::Geophysics
Physics::Fluid Dynamics
Fractal
Heat transfer
Fracture (geology)
Fractal theory
TA1-2040
Engineering (miscellaneous)
Subjects
Details
- ISSN :
- 2214157X
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Case Studies in Thermal Engineering
- Accession number :
- edsair.doi.dedup.....0e729cc56ee0538257c6a882d9890ee7