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Hydro-thermal coupling in a rough fracture |
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Heat exchange during laminar flow is studied at the fracture scale on the basis of
the Stokes equation. We used a synthetic aperture model (a self-affine model) that
has been shown to be a realistic geometrical description of the fracture morphology.
We developed a numerical modelling using a finite difference scheme of the
hydrodynamic flow and its coupling with an advection/conduction description of the
fluid heat. As a first step, temperature within the surrounding rock is supposed to
be hot and constant. Influence of the fracture roughness on the heat flux through the
wall when a cold fluid is injected, is estimated and a thermalization length is shown
to emerge. Our model shows that fracture roughness is responsible for channelling
effects. Fluid flow is dominant in a significant subpart of the fracture where heat
advection is important. Accordingly, temperature distribution is strongly affected by
small fluctuations of the fracture aperture.
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Id: |
26 |
Place: |
Volterra, Tuscany, Italy Campus SIAF, SP del Monte Volterrano
Localita' Il Cipresso
Volterra, Italy |
Starting date: |
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Duration: |
03' |
Primary Authors: |
Ms. NEUVILLE, Amélie (IPGS) |
Co-Authors: |
Mr. TOUSSAINT, Renaud (IPGS) Mr. SCHMITTBUHL, Jean (IPGS) |
Presenters: |
Ms. NEUVILLE, Amélie |
Material: |
Slides Poster |
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