Page 317 - Geothermal Energy Systems Exploration, Development, and Utilization

References 293

λ 1st Lam´ e constant (Pa)
−1
λ heat conductivity of porous media (W m −1 K )
−1
◦
heat conductivity at 20 C(W m −1 K )
λ 20
λ hydraulic drag or friction coefficient, Equation 5 ( )
µ dynamic fluid viscosity (Pa s)
ν Poisson ratio
−1
ω thermal gradient (K m )
ω mass fraction, Equation 16 (−)
−3
ρ density of porous medium (kg m )
σ effective stress tensor (Pa)
ς relative temperature coefficient (−)
Superscripts

in value at the injection borehole
l liquid phase
out value at the production borehole
s solid phase
T transpose of matrix

Subscripts

f fracture
r reference value
0 value at initial condition (t = 0) or reference value

Special Symbols

∇A gradient of a scalar
∇· A divergence of a vector
∇A gradient of a vector

References
Al-Wardy, W. and Zimmerman, R.W. Webb, S.W., Rejeb, A., Tijani, M.,
(2003) Effective Stress Law for the Per- Maouche, Z., Kobayashi, A., Kurikami,
meability of Clay-rich Sandstones. 16th H., Ito, A., Sugita, Y., Chijimatsu, M.,
ASCE Engineering Mechanics Confer-
Borgesson, L., Hernelind, J., Rutqvist,
ence, July16–18, University of Washing-
J., Tsang, C.F., and Jussila, P. (2005)
ton, Seattle.
The FEBEX benchmark test: case def-
Alonso, E.E., Alcoverro, J., Coste, F.,
inition and comparison of modelling
Malinsky, L., Merrien-Soukatchoff, V.,
Kadiri,I.,Nowak,T.,Shao,H.,Nguyen, approaches. International Journal of
T.S., Selvadurai, A.P.S., Armand, G., Rock Mechanics and Mining Sciences,
Sobolik,S.R.,Itamura,M.,Stone,C.M., 42(5–6), 611–638.