Geology Reference
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Figure 8.5. Kinematic viscosity versus temperature for various fluids.
8.3 Turbine Model Development
Having justified the use of air as a working fluid, we now address the
details needed to apply wind tunnel analysis to turbine design. We ask, “What
are the important flow parameters?” Also, “How are wind measurements
converted to those for actual downhole flow?” Now, recall from our above
discussion that with conditions (i) and (ii) satisfied, condition (iii) implies that
the torque T depends on ½UU 2 SR and a dimensionless number C T which
depends on geometric shape only (the “1/2,” added for convenience, is
customary in aerodynamics). The C T is our dimensionless “torque coefficient,”
analogous to the “lift coefficient” used in classical airfoil theory.
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