The study shows that if the fracture aperture is of uniform aperture, there is no significant difference between assuming a constant viscosity in the model over a temperature-dependent viscosity. Second is the possibility that the fractures, the main flow conduits, may have asperities that could create channels and alter flow paths, thus affecting the amount and distribution of the surface area available for heat transfer. First, the viscosity and density of water vary with temperature and pressure. The numerical simulation model studied accounts for two situations that may occur during heat extraction from an enhanced geothermal system. The primary focus of this paper is to investigate the relevance of temperature-dependent viscosity in the numerical modeling of enhanced geothermal systems (EGS) for thermal performance evaluation and forecasting.
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