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Fig. 7 | Geothermal Energy

Fig. 7

From: Thermally driven fracture aperture variation in naturally fractured granites

Fig. 7

Evolution of hydraulic apertures. a Step-wise heating experiments (\(\#\)N14-S1, \(\#\)N14-S2, and \(\#\)N14-S3) using Specimen N14 under 3 different confining stresses (20, 30, and 40 MPa). Inset: discrete hydraulic apertures at steady-state conditions. b Constant-rate heating experiments (\(\#\)N19-C1, \(\#\)N19-C2) using Specimen N19 under 2 different confining stresses (20 and 30 MPa). All experiments were performed with a pore-fluid pressure of 15 MPa

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